Reconsider the previous question about number of Facebook friends. Using the data from the sample of 49 students, a 99% confidence interval for the average number of Facebook friends is found to be (425.0, 653.4). For each of the following statements, say whether VALID or INVALID.
a. We are 99% confident that the average number of Facebook friends the 49 students who were surveyed have is between 425 and 653.4.
b. We are 99% confident that the average number of Facebook friends all such people have is between 425 and 653.4.
c. About 99% of all such people have between 425 and 653.4 number of friends, on average.