Does walking lower systolic blood pressure? Driving: x-bar = 125, s = 1, n = 32 Walking: x-bar = 119 miles, s = 1, n = 35 Construct a 95% confidence interval  1. What are the Degrees of Freedom on our data? 2. What is the Upper Limit of the Confidence Interval? 3. What is the Lower Limit of the Confidence Interval? 4. Based on your data, does walking lower systolic blood pressure?

Statistics students surveyed 135 students at Tallahassee Community College. From their data we are 95% confident that between 44.7% and 61.9% of all TCC students are female. The students realize that this interval contains a large margin of error. What can they do to make a narrower interval? 1. Survey more students.   2. Use a 99% confidence level.   3. Survey more students and use a 99% confidence interval.   4. None of the other choices.

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Length of a confidence interval. Which confidence interval would be shorter, a confidence interval computed using a sample size of 90 or a confidence interval computed using a sample size of 900? Assume that the confidence level is 95% for both confidence intervals and that the only difference between them is the sample size. Explain your reasoning.

Using the normal table or t-table, determine the critical z-value to use in calculating a 95% confidence interval for a proportion. Enter your answer to two decimal places (i.e. use the exact value from the table).

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