In order to assist advertisers in targeting advertising to the appropriate age groups, Ipsos surveyed 9700 Canadian adults to record the amount of time they spent consuming media and obtained the following results:

Assume that the number of people surveyed is proportional to the age range of each age group, rounded to the nearest integer. (For example, number of Boomers surveyed = 9700 × (66 – 47)/(97 – 47) = 3686.) Also assume that the standard deviation is 35% of the time spent (e.g., SD for Boomers = 0.35 × 6.2 = 1.86 hrs).

a) Is the time spent consuming media by the Generation Xers higher than for the Leading Millennials? Give the P-value for the level of significance.

b) Is the time spent consuming media by the Trailing Millennials higher than for the Boomers? Give the P-value for the level of significance.

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Age Group Birth Years Time Spent (hrs) 1947–65 Boomers 6.2 1966–81 Generation Xers 5.3 Leading Millennials 1982–89 5.2 Trailing Millennials 1990–96 6.6