Sales force Exact Target Marketing Cloud conducted a study of U. S. consumers that included 205 tablet owners. The study found that 134 tablet owners use their tablet while watching TV at least once per day. (Source: “New Mobile Tracking & ­Survey Data: 2014 Mobile Behavior Report,” bit.ly/1odMZ3D.) The authors of the report imply that the survey proves that more than half of all tablet owners use their tablet while watching TV at least once per day.
a. Use the five-step p-value approach to hypothesis testing and a 0.05 level of significance to try to prove that more than half of all tablet owners use their tablet while watching TV at least once per day.
b. Based on your result in (a), is the claim implied by the authors valid?
c. Suppose the study found that 105 tablet owners use their ­tablet while watching TV at least once per day. Repeat parts (a) and (b).
d. Compare the results of (b) and (c).