A reading teacher wanted to know how many books her students red over the summer. She asked the local librarian to keep a record for her. The record showed that 7 students checked out a total of 60 books. At the first faculty Meeting she reported that, on average, students in her class read 8.6 books over the summer.
a. Consider the sampling method.
b. Consider the measurement of the variable of interest.
c. Consider the source.
d. Consider possible confounding variables.