Continuation 5 of 15 (0 complete) w State whether each of the following changes

Question

Continuation


5 of 15 (0 complete) w State whether each of the following changes would make a confidence interval wider or narrower. Assume that nothing else changes.) a. Changing from a 95% confidence level to a 90% confidence level. b. Changing from a sample size of 350 to a sample size of 20. c, changing from a standard deviation of 15 pounds to a standard deviation of 25 pounds. EER Click the icon to view the t-table. a. How will changing from a 95% confidence level to a 90% confidence level affect the width of the confidence interval? O A. The interval will become wider. O B. The interval will become narrower. O C. This change will not affect the width of the interval. Click to select your answer. Pa

Explanation / Answer

a)Generally, lowerthe confidence level, narrower is the confidence interval since z would be lower.

b) COnfidence interval is inversely proportional to the sample size, n . Hence, changin from 350 to 20 will widen the interval.

C) COnfidcene interval is directly proportional to standard deviation. Hence changing from 15to 25 will widen it.

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