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T Distribution Quiz 1 (25 MCQs)

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1. When testing with $ \alpha=0.01$ you get $ p=0.12$ . Your decision should be
2. Given a set of data, which of the following refers to the independent observations?
3. Find the critical value (t-score) for a 99% confidence interval with a sample of 23 people.
4. What is the right-tailed area if the confidence interval is 75%?
5. This refers to the maximum number of logically independent values which varies in the data sample.
6. A z distribution would be the same as a t distribution with how many degrees of freedom?
7. In a New York modeling agency, a researcher wishes to see if the average height of female models is really less than 67 inches, as the chief claims. A random sample of 20 models has an average height of 65.8 inches. The standard deviation of the sample is 1.7 inches. At $ \alpha=0.05$, is the average height of the models really less than 67 inches? List test, p-value, and decision.
8. What is the other term for t-distribution?
9. Find the degree of freedom of n = 28.df =?
10. Which of the following is the value of t0.05 with a sample size of 10?
11. T-distribution is also known as _____
12. Sam uses a t-distribution to compute a 99% interval. How many trials would need to be in his sample in order to use the critical value of 2.878?
13. 1. Which of the following is the value of t0.01 with 11 degrees of freedom?
14. The t-score that would be used to construct a 99% confidence interval for the mean with a sample of size n=17 would be _____
15. These are number of values that are free to vary after a sample statistic has been computed.
16. Given df = 30 with 99% confidence find the t-value
17. Find the degree of freedom of n = 15. df =?
18. A 90% confidence interval for the mean speed driven by cars on East Main St. is given by (21, 45). What was the EBM of this study?
19. The 90% interval for a statistics test has a sample mean of 72 and an EBM of 7. What is the lower bound for the interval?
20. What is the degree of freedom if the sample size is 20?
21. This refers to the measure of position with data divided into 100 parts.
22. T-distribution is a probability distribution used to estimate parameters EXCEPT when _____
23. What is the t-score associated with 90% confidence and a sample size of 15?
24. Which of the following is true about the t-distribution?
25. For a sample of size 20 taken from a normally distributed population with standard deviation equal to 5, a 90% confidence interval for the population mean would require the use of _____
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