Question: for a fixed sample size, what happens to a confidence interval for the population mean when we increase the level of confidence? a. The value

for a fixed sample size, what happens to a confidence interval for the population mean when we increase the level of confidence?

a. The value of alpha will increase

b. The confidence interval will be a more precise estimate of the population mean

c. The width of the confidence interval will increase

d. The width of the confidence interval will decrease

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