We wish to develop a confidence interval for the population mean. The population standard deviation is known. We have a sample of 40 observations. We decide to use the 92 percent level of confidence. The appropriate value of z is:
A: 1.75.
B: 1.96.
C: 1.65.
D: 2.58.
发布时间:2024-04-16 21:33:52