In a random sample of 55 refrigerators, the mean repair cost was $110.00 and the population standard deviation is $19.20. A 90% confidence interval for the population mean repair cost is (105.59, 114.41).
Change the sample size to n=110. Construct a 90% confidence interval for the population mean repair cost. Which confidence interval is wider? Explain.
Construct a 90% confidence interval for the population mean repair cost.
The 90% confidence interval is (____, _____). (Round to two decimal places as needed.)
Which confidence interval is wider? Explain.
Choose the correct answer below.
A. The n=90 confidence interval is wider because a larger sample is taken, giving more information about the population.
B. The n=90 confidence interval is wider because a smaller sample is taken, giving less information about the population.
C. The two intervals are the same size because the confidence interval is based on the level of confidence and sample standard deviation.