Question

Problems $29-38$each include a normal probability plot and either a frequency histogram or a stem-and-leaf diagram for a set of sample data. The intent is to use the sample data to perform a hypothesis test for the mean of the population from which the data were obtained. In each case, consult the graphs provided to decide whether to use the $z-$test, the $t-$test, or neither: Explain your answer.
The normal probability plot and stem-and-leaf diagram of the data are depicted in Fig. $9.24$(next page); $\sigma$is unknown.

Short answer

As the sample size is large$\sigma$is unkown.

Step-by-step solution

Step 1. Given Information

A graph with plottings:

Step 2. Observing the graph

As we can observe that the sample size is large, so the is unknown and there is no outlier data that appears to be reasonable to use $t-$test here.