Question 7.165

39. Abandoning Landlines. The National Health Interview Survey reports that 25% of telephone users no longer use landlines, and have switched completely to cell phone use. Suppose we take samples of size 36.

  1. Find the mean and standard error of the sampling distribution of , the sample proportion of telephone users who no longer use landlines.
  2. Describe the sampling distribution of .
  3. Compute the probability that exceeds 0.26.

7.2.39

(a) (b) Approximately normal (0.25, 0.0722) (c) 0.4443 (TI-83/84: 0.4449)