Question 6.161

63. Abandoning Landlines. Refer to Exercise 59.

  1. Calculate the mean, variance, and standard deviation of the number of users in the sample who have abandoned their landlines. Interpret the mean.
  2. Suppose the sample contains no users who have abandoned their landlines. Is this outcome unusual or an outlier? Use the -score method to find out.

6.2.63

(a) telephone users who have abandoned their landline; telephone users who have abandoned their landline squared; telephone users who have abandoned their landline. If we take infinitely many random samples of telephone users of size 12 and calculate the mean number of telephone users who have abandoned their landline it would be 4.92. (b) Moderately unusual