Question

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 for means ($\mu$), $\mu$ represents the population parameter. Here, the student is testing a hypothesis about CCC students. The sample is just a subset used to make inferences about the entire population of CCC students. Option A is about the sample mean (not the population parameter $\mu$). Option B is about the average user (not CCC students which is the population of interest for this hypothesis).

Answer:

C. Mean number of Facebook friends for CCC students