Question

Assume that you are constructing a confidence interval for the mean (sigma known), and you are thinking about using a sample of 200 cases. You want to work at the 95% level of confidence, but you want to had. ve a reasonably precise estimate. One way to increase the precision of your estimate would be to:

a. decrease the size of your sample
b. increase the size of the population
c. increase the size of your sample
decrease the size of the population

Answer 1

To increase the precision of the estimate in a confidence interval for the mean (sigma known), you should increase the size of your sample.

Step-by-step explanation:

To increase the precision of the estimate in a confidence interval for the mean (sigma known), you should increase the size of your sample. A larger sample size will result in less variability and a narrower confidence interval. This means that the estimate will be more precise and closer to the true population mean.