Consider the following four intervals based on the data of Exercise 12.17 (Section 12.2): a. A 95%

Question:

Consider the following four intervals based on the data of Exercise 12.17 (Section 12.2):
a. A 95% CI for mean porosity when unit weight is 110
b. A 95% PI for porosity when unit weight is 110
c. A 95% CI for mean porosity when unit weight is 115
d. A 95% PI for porosity when unit weight is 115
Without computing any of these intervals, what can be said about their widths relative to one another?