We wish to develop a confidence interval for the populationmean. The shape of th

We wish to develop a confidence interval for the populationmean. The shape of the population is not known but we have asample of 40 observations. We decide to use the 92 percent level ofconfidence. The appropriate value of z is: a. 1.96 b. 1.65 c. 2.58d. 1.75