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Variables In Research Quiz 80 (10 MCQs)

This set of multiple-choice questions evaluates understanding of variables in research, including independent and dependent variables, confounding factors, and research design. It covers concepts such as bio-chemical changes, customer satisfaction measurement, and the role of extraneous variables. The questions also assess knowledge of measurement scales, interval properties, and experimental design.

Quiz Instructions

Select an option to see the correct answer instantly.

1. The variable measured in an experiment is:

Correct Answer: Correct answer is: (C) The dependent variable.

Exam Relevance: AP Statistics, GRE, MCAT, Psychology exams

Difficulty: Moderate

Concept notes: In research, the dependent variable is the variable that is measured or observed to determine the effect of the independent variable.

Common Mistakes: A common misunderstanding is confusing the independent variable with the dependent variable. The independent variable is the one that is manipulated or changed by the researcher, while the dependent variable is the outcome that is measured.

Explanations: The dependent variable is the variable that is measured in an experiment. It is the outcome that the researcher is interested in observing and recording to determine the effect of the independent variable. The independent variable is the one that is manipulated or changed by the researcher to observe its effect on the dependent variable. The null hypothesis and alternative hypothesis are statements about the relationship between variables, not the variables themselves.

Option Analysis:

Option A: The independent variable is the one that is manipulated or changed by the researcher, not the one that is measured.
Option B: A null hypothesis is a statement that there is no relationship between the variables, not a variable itself.
Option C: The dependent variable is the variable that is measured in an experiment to observe the effect of the independent variable.
Option D: An alternative hypothesis is a statement that there is a relationship between the variables, not a variable itself.

2. What is the dependent variable in experimental research?

Correct Answer: Correct answer is: (B) The outcome measured.

Exam Relevance: AP Psychology, GRE Psychology, MCAT, Research Methods Exams

Difficulty: Easy

Concept notes: In experimental research, the dependent variable is the outcome that is measured to assess the effect of the manipulated variable.

Common Mistakes: A common misunderstanding is confusing the dependent variable with the independent variable, which is the manipulated variable.

Explanations: The dependent variable is the variable that is observed and measured in an experiment to determine the effect of the independent variable. It is called "dependent" because its value depends on the manipulation of the independent variable. In experimental research, the goal is to determine how changes in the independent variable affect the dependent variable.

Option Analysis:

Option A: The manipulated variable is the independent variable, not the dependent variable.
Option B: The outcome measured is the dependent variable, which is the correct answer.
Option C: The control variable is a variable that is kept constant to ensure that any changes in the dependent variable are due to the independent variable.
Option D: The random variable is not a term typically used in experimental research in this context.

3. The ..... is controlled by the experimenter, while the ..... represents the information collected and statistically analyzed by the experimenter.

Correct Answer: Correct answer is: (B) Independent variable; dependent variable.

Exam Relevance: AP Psychology, GRE, MCAT, Research Methods Exams

Difficulty: Easy

Concept notes: In research, the independent variable is the factor that the experimenter manipulates or controls, while the dependent variable is the outcome that is measured and analyzed.

Common Mistakes: A common mistake is confusing the roles of the independent and dependent variables. The independent variable is what the experimenter changes, and the dependent variable is what changes in response.

Explanations: The independent variable is controlled by the experimenter because it is the factor that is deliberately manipulated to observe its effect on the dependent variable. The dependent variable represents the information collected and statistically analyzed because it is the outcome that is measured to determine the effect of the independent variable.

Option Analysis:

Option A: Incorrect because the dependent variable is not controlled by the experimenter; it is the outcome that is measured.
Option B: Correct because the independent variable is controlled by the experimenter, and the dependent variable is the outcome that is measured and analyzed.
Option C: Incorrect because the placebo effect and experimenter bias are not directly related to the roles of independent and dependent variables.
Option D: Incorrect because experiment bias and placebo effect are not directly related to the roles of independent and dependent variables.

4. A measurement scale that in addition to ordering scores from highest to lowest, establishes a uniform unit in the scale so that any distance between two consecutive scores is of equal magnitude.

Correct Answer: Correct answer is: (C) Interval Scale.

Exam Relevance: AP Statistics, GRE, GMAT, Psychology exams

Difficulty: Moderate

Concept notes: An interval scale is a type of measurement scale that not only orders scores from highest to lowest but also establishes a uniform unit so that the distance between any two consecutive scores is of equal magnitude.

Common Mistakes: A common misunderstanding is confusing the interval scale with the ordinal scale, which only orders scores without establishing equal intervals between them.

Explanations: The interval scale is the correct answer because it meets the criteria of ordering scores and establishing a uniform unit of measurement. This means that the difference between any two consecutive scores is the same, which is a key characteristic of the interval scale. For example, the difference between 10 and 20 degrees Celsius is the same as the difference between 20 and 30 degrees Celsius.

Option Analysis:

Option A: Nominal Scale: This scale only categorizes data without any order or equal intervals.
Option B: Ordinal Scale: This scale orders data but does not establish equal intervals between consecutive scores.
Option C: Interval Scale: This scale orders data and establishes equal intervals between consecutive scores.
Option D: Ratio Scale: This scale orders data, establishes equal intervals, and has a true zero point, which is not mentioned in the question.

5. Maya designed an experiment to answer the following question: How does the amount of water given to a limabean seed affect how tall it grows?In this experiment, what variable should Maya CHANGE?

Correct Answer: Correct answer is: (A) The amount of water.

Exam Relevance: AP Biology, IB Biology, SAT Subject Test in Biology

Difficulty: Easy

Concept notes: In an experiment, the independent variable is the factor that the experimenter changes to observe its effect on the dependent variable. The dependent variable is what is measured or observed in response to changes in the independent variable.

Common Mistakes: A common mistake is to confuse the independent variable with the dependent variable or other controlled variables.

Explanations: Maya's experiment aims to determine how the amount of water affects the height of limabean plants. The amount of water is the independent variable because it is the factor that Maya will change to observe its effect on the height of the plants. The height of the plants is the dependent variable, as it is the outcome that Maya will measure.

Option Analysis:

Option A: This is the correct answer because the amount of water is the independent variable that Maya will change in the experiment.
Option B: The kind of plant is not the variable Maya should change, as she is specifically studying limabean plants.
Option C: The type of soil is not the variable Maya should change, as it is not the focus of her experiment.
Option D: The amount of sunlight is not the variable Maya should change, as it is not the focus of her experiment.

6. A scientist wants to understand if stress can affect memory. She tests this hypothesis by observing teachers teaching students quietly, peacefully, gently and other teachers teaching by shouting and getting angry. The students are tested and the results show that the students with the calm teachers got better grades. Which is the dependent variable?

Correct Answer: Correct answer is: (A) The grades the students got.

Exam Relevance: AP Psychology, IB Psychology, GRE Psychology

Difficulty: Moderate

Concept notes: In research, the dependent variable is the outcome that is measured to assess the effect of the independent variable. Here, the grades the students got are the outcome being measured to see the effect of the teaching style (calm vs. angry).

Common Mistakes: A common mistake is to confuse the dependent variable with the independent variable. In this case, the teaching style (calm or angry) is the independent variable, not the dependent variable.

Explanations: The dependent variable is what the researcher measures to determine the effect of the independent variable. In this study, the grades the students got are the dependent variable because they are the outcome being measured to see if the teaching style (calm or angry) has an effect on student performance.

Option Analysis:

Option A: The grades the students got are the dependent variable because they are the outcome being measured to assess the effect of the teaching style.
Option B: The angry, shouting teachers are the independent variable because they represent the condition or treatment being applied to see its effect on the dependent variable (student grades).

7. In an experiment, after completing conditioning once, an injection of a drug affecting neuro transmitter substance was given to the affecting neuro transmitter substance was given to the subject. Then, the subject was conditioned again. In this experiment, what were bio-chemical changes treated as?

Correct Answer: Correct answer is: (D) Intervening variable.

Exam Relevance: AP Psychology, IB Psychology, GRE Psychology

Difficulty: Moderate

Concept notes: In research, variables are categorized into independent, dependent, control, and intervening variables. An intervening variable is a hypothetical construct that is used to explain the relationship between the independent and dependent variables. It is not directly observed but is inferred from the observed data.

Common Mistakes: A common mistake is to confuse the intervening variable with the independent or dependent variable. The intervening variable is not directly manipulated or measured but is inferred to explain the relationship between the independent and dependent variables.

Explanations: In this experiment, the bio-chemical changes are not directly manipulated (independent variable) or measured (dependent variable). Instead, they are inferred to explain the relationship between the drug injection (independent variable) and the conditioning process (dependent variable). Therefore, the bio-chemical changes are treated as an intervening variable.

Option Analysis:

Option A: The dependent variable is the outcome that is measured in the experiment. In this case, the dependent variable would be the subject's response to conditioning, not the bio-chemical changes.
Option B: The independent variable is the factor that is manipulated by the experimenter. In this case, the independent variable is the drug injection, not the bio-chemical changes.
Option C: The control variable is a factor that is kept constant to ensure that any changes in the dependent variable are due to the independent variable. The bio-chemical changes are not being controlled but are inferred to explain the relationship between the drug injection and the conditioning process.
Option D: The intervening variable is a hypothetical construct that explains the relationship between the independent and dependent variables. The bio-chemical changes are inferred to explain the relationship between the drug injection and the conditioning process, making them an intervening variable.

8. In an experiment, the variable that changes in response to independent variable is known as

Correct Answer: Correct answer is: (B) Dependent variable.

Exam Relevance: AP Psychology, IB Psychology, GRE Psychology

Difficulty: Easy

Concept notes: In research, the dependent variable is the outcome that is measured in response to changes in the independent variable.

Common Mistakes: A common misunderstanding is confusing the dependent variable with the independent variable, which is the variable that is manipulated or changed by the experimenter.

Explanations: The dependent variable is the variable that changes in response to the independent variable. It is the outcome that the researcher measures to determine the effect of the independent variable. In an experiment, the dependent variable is what the researcher is interested in observing and measuring.

Option Analysis:

Option A: The independent variable is the variable that is manipulated or changed by the experimenter, not the one that changes in response.
Option B: The dependent variable is the variable that changes in response to the independent variable, making it the correct answer.
Option C: "Changing variable" is not a standard term in research methodology. The term "dependent variable" is the correct term for the variable that changes in response to the independent variable.
Option D: The control variable is a variable that is kept constant to ensure that any changes in the dependent variable are due to the independent variable and not other factors.

9. If a researcher studies fourth-grade students to determine the effects of rewarding good behavior on subsequent behavior, which of the following is least likely to be an extraneous variable?

Correct Answer: Correct answer is: (A) Student grade level.

Exam Relevance: AP Psychology, GRE Psychology, Research Methods in Psychology

Difficulty: Moderate

Concept notes: In research, extraneous variables are factors that can influence the outcome of the study but are not the focus of the research. The goal is to control or eliminate these variables to ensure the validity of the results.

Common Mistakes: A common mistake is to confuse extraneous variables with the independent or dependent variables. In this case, the independent variable is the rewarding of good behavior, and the dependent variable is the subsequent behavior.

Explanations: The correct answer is student grade level because the study is specifically focused on fourth-grade students. Since all participants are in the same grade, grade level is not an extraneous variable that could confound the results. Other factors like student attitude, teacher characteristics, and parent's parenting style could vary among participants and thus could influence the results, making them extraneous variables.

Option Analysis:

Option A: Student grade level is consistent across all participants and thus not an extraneous variable.
Option B: Student attitude can vary among participants and could influence the results, making it an extraneous variable.
Option C: Teacher characteristics can vary and could influence the results, making it an extraneous variable.
Option D: Parent's parenting style can vary and could influence the results, making it an extraneous variable.

10. Managers and researchers have decided to focus on customer-satisfaction levels in their marketing research study. They have determined the

Correct Answer: Correct answer is: (A) Relevant variable.

Exam Relevance: Marketing Research Exams, Business Research Methods Exams, MBA Exams

Difficulty: Moderate

Concept notes: In research, a relevant variable is a factor that is directly related to the study's objectives. In this case, customer-satisfaction levels are directly related to the marketing research study's focus.

Common Mistakes: A common misunderstanding is confusing the unit of analysis with the relevant variable. The unit of analysis refers to the entity being studied, while the relevant variable is the specific factor being measured.

Explanations: Customer-satisfaction levels are the specific factor being measured in the marketing research study. Therefore, they are the relevant variable. The other options do not directly address the specific factor being measured in the study.

Option Analysis:

Option A: Correct. Customer-satisfaction levels are the specific factor being measured, making them the relevant variable.
Option B: Incorrect. The unit of analysis refers to the entity being studied, not the specific factor being measured.
Option C: Incorrect. Situation analysis is a broader term that involves understanding the context of the study, not the specific factor being measured.
Option D: Incorrect. Primary data refers to the raw data collected directly from the source, not the specific factor being measured.

Frequently Asked Questions

What is the difference between an independent and a dependent variable?

An independent variable is the factor that is manipulated or changed by the researcher, while a dependent variable is the outcome measured that is expected to change in response to the independent variable.

How do extraneous variables affect research validity?

Extraneous variables are factors that can influence the outcome of an experiment but are not part of the study. They can reduce the validity of research by introducing confounding factors that obscure the relationship between the independent and dependent variables.

What is an interval scale and how is it used in research?

An interval scale is a type of measurement scale where the intervals between values are equal, but there is no absolute zero. It is used in research to measure variables that have uniform units and equal intervals, such as temperature or time.

How can intervening variables impact experimental design?

Intervening variables are hypothetical constructs that explain the relationship between the independent and dependent variables. They can impact experimental design by requiring researchers to control or account for these variables to ensure accurate results.

What role do confounding factors play in marketing research?

Confounding factors in marketing research can distort the relationship between variables, such as customer satisfaction and product features. Researchers must identify and control these factors to ensure that the results accurately reflect the intended relationship.

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