Suppose you have a random sample of employees in your company and their tenure. The sample mean of this sample is 4.2 years and the sample standard deviation is 4.5 years. How would knowing that the random sample was of size 100 instead of 60 change the 90% confidence interval for the population mean of employee tenure?
A. The 90% confidence interval will be biased for 100.
B. The 90% confidence interval will be larger for 100 than 60.
C. The 90% confidence interval will be smaller for 100 than 60.
D. The 90% confidence interval will be biased for 60.
Answer: C
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