Question

question 2
according to facebooks self - reported statistics, the average facebook user has 130 facebook friends. for a statistics project a student at contra costa college tests the hypothesis that ccc students will average more than 130 facebook friends.
she randomly selects 3 classes from the schedule of classes and distributes a survey in these classes. her sample contains 45 students.
here are the null and alternative hypotheses for her study: $h_0:mu = 130, h_a:mu>130$.
what does $mu$ represent in these hypotheses?
a. mean number of facebook friends for the ccc students in her sample
b. mean number of facebook friends for the average user
c. mean number of facebook friends for ccc students

Explanation:

In hypothesis - testing about a population parameter, $\mu$ represents the population mean. Here, the student is testing a hypothesis about the average number of Facebook friends for CCC students. So, $\mu$ is the mean number of Facebook friends for the entire population of CCC students, not just the sample or the average user in general.

Answer:

C. Mean number of Facebook friends for CCC students