8.31 “Guitar Hero” and “Rock Band.”
Refer to the previous exercise.
8.31
(a) (0.641, 0.699). (b) (0.653, 0.687). (c) While it’s true that if the sample size gets smaller or bigger, the margin of error will go up or down, in all three cases, the sample is quite large and the results don’t differ that much, so the main conclusion still holds.