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Confidence Intervals Quiz 4 (6 MCQs)

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1. Suppose that a confidence interval for hours worked by students was computed to be (8.82, 10.78). Which of these is a valid interpretation of this confidence interval?

2. Compute a 95% confidence interval:Hint:use p-hat formulaAfter watching a horror film, 34 out of 50 people reported problems getting to sleep.

3. You want to estimate, with 95% confidence, the proportion of households with pets. Your estimate must be accurate within 3% of the population proportion. No preliminary estimate is available. Find the minimum sample size needed.

4. Find the value of zc for a 90% confidence interval.

5. A local bank needs information concerning the savings account balances of its customers. A random sample of 13 accounts was checked. The mean balance was $ 686.75 with a sample standard deviation of $ 256.20. Find a 95% confidence interval for the true mean.

6. You are given two sets of data measuring the same information, both with the same sample size. Set A has a larger Standard Error than Set B. If you were looking for a 99.8% Confidence Interval, which set would have a larger Margin of Error?

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Confidence Intervals Quiz 4 (6 MCQs)

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