A researcher is studying changes in the student body at her university and has selected a random sample of 163 from the freshman class. The table below compares their characteristics to those of the student body as a whole. Which differences are significant?

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Variable Proportion Republican Proportion majoring in math and science Average family income Freshmen All Students 0.49 H-59,235 1.2 P 0.44 a. b. c. P 0.17 X 63,542 s-1,568 X 0.9 s 0.2 X- 1.5 S 0.4 X 4.5 s 0.3 P 0.09 d. Average number of siblings e Average number of telephone calls f. Average number of close friends living μ 0.4 to parents per week 7.8 on campus