The accompanying table contains a portion of data from the National Longitudinal Survey (NLS), which follows over 12,000 individuals in the United States over time. Variables in this analysis include the following information on individuals: Urban (1 if lives in urban area, 0 otherwise), Siblings (number of siblings), White (1 if white, 0 otherwise), Christian (1 if Christian, 0 otherwise), FamilySize, Height, Weight (in pounds), and Income (in $).

 

a. Remove Height and Weight from the data set.

b. Subset the data to create two data sets, one that includes observations who live in an urban area and have incomes over $40,000 and one that includes the rest of the observations.

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Urban 1 1 ⠀ 1 Siblings 8 1 ⠀ 2 White 1 1 I 1 ... Income 0 40000 43000