TABLE 12-13 Recent Studies Have Found That American Children Are More Obese

TABLE 12-13
Recent studies have found that American children are more obese than in the past.The amount of time children spent watching television has received much of the blame.A survey of 100 ten-year-olds revealed the following with regards to weights and average number of hours a day spent watching television.We are interested in testing whether the mean number of hours spent watching TV and weights are independent at 1% level of significance.
-A local real estate appraiser analyzed the sales prices of homes in 2 neighborhoods to the corresponding appraised values of the homes.The goal of the analysis was to compare the distribution of sale-to-appraised ratios from homes in the 2 neighborhoods.Random and independent samples were selected from the 2 neighborhoods from last year's homes sales,8 from each of the 2 neighborhoods.Identify the nonparametric method that would be used to analyze the data.

A) χ² test for the differences among more than two proportions
B) McNemar test for the difference between two proportions
C) the Wilcoxon Rank Sum Test,using the test statistic T₁
D) χ² test for the variance