Question 6.13

6.13 Why the difference?

Refer to the previous exercise. In Exercise 6.1 (page 289), a survey by AppsFire reported a median of 108 apps per device. This is very different from the average reported in the previous exercise.

  1. Do you think that the two populations are comparable? Explain your answer.
  2. The AppsFire report provides a footnote stating that its data exclude users who do not use any apps at all. Explain how this might contribute to the difference in the two reported statistics.

6.13

(a) In 6.1, the population was all AppsFire users, while in 6.12, the population is all U.S. smartphone subscribers. It is likely that one group has more apps. (b) Excluding those with no apps will increase the mean/median and could account for the difference.