Draw Inferences From Random Samples Practice Test

A librarian wants to estimate the average number of pages in all the mystery books in the school library (the population). She randomly selects 25 mystery books and finds the sample mean is 218 pages. Which is the best inference about the population mean number of pages?

To estimate the percentage of students who would vote for Team Blue in a spirit-week poll, three random samples were taken:

Sample 1 (n=80): 46 students vote Team Blue

Sample 2 (n=80): 50 students vote Team Blue

Sample 3 (n=80): 48 students vote Team Blue

Which is the most reasonable conclusion about the population percentage and the variability of these estimates?