According to the Nielsen’s Television Audience Report, the mean number of televisions per household in 2009 was 2.9. Treating the results of the StatCrunch survey as a random sample of U.S. residents, determine whether there is evidence to suggest the number of televisions per household has risen since then. Use the a = 0.05 level of signiﬁcance.
(a) Retrieve the results of the number of televisions per household from the Sullivan Statistics Survey. What is the mean and standard deviation number of televisions per household in the survey?
(b) Draw a boxplot of the data. Describe the shape of the distribution. Are there any outliers? Do you believe it is reasonable to use the normal model to describe the distribution of the sample mean? Why?
(c) Conduct the appropriate test to determine if the results of the survey suggest the number of televisions per household has increased since 2009.