State whether each of the following changes would make a confidence interval wider or narrower. (Assume that nothing else changes.) a. Changing from a 90% confidence level to a 95% confidence level. b. Changing from a sample size of 200 to a sample size of 20. c. Changing from a standard deviation of 30 pounds to a standard deviation of 15 pounds. Click the icon to view the t-table. a. How will changing from a 90% confidence level to a 95% confidence level affect the width of the confidence interval? OA. The interval will become wider. OB. The interval will become narrower. OC. This change will not affect the width of the interval. b. How will changing from a sample size of 200 to a sample size of 20 affect the width of the confidence interval? OA. The interval will become wider. OB. The interval will become narrower. OC. This change will not affect the width of the interval. c. How will changing from a standard deviation of 30 pounds to a standard deviation of 15 pounds affect the width of the confidence interval? OA. The interval will become wider. OB. The interval will become narrower. OC. This change will not affect the width of the interval.

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