Question

Twelve pairs of indentical twins take tests to measure their aggression on a scale from 0 to 100, where 100 is the most aggressive. The researchers' question is whether first born and second born twins differ in mean aggressiveness. We assume that first born scores, second born scores, and their differences are all approximately normal, and there are no outliers. First born Second born 86 88 71 77 77 76 68 64 91 96 87 72 a. Is this a problem with (A) independent samples, or (B) matched-pairs samples? Please type either A or B. b. Construct a 95% confidence interval for the mean difference in first-born aggression minus second-born aggression. Lower bound = and upper bound Please round the answers to 1 decimal place. c. Does first born and second born twins differ in mean aggressiveness at the a-0.05 level of significance? Please type either A or B. A There is sufficient evidence to support the claim that there is a difference between the aggression of first born and second born twins. B. There is not sufficient evidence to support the claim that there is a difference between the aggression of first born and second born twins.

Answer 1

first boon (f) - Second born (s' da farsi 86 88 -2 77 -6 7 77 76 64 4 91 87 96 72 15 How sa sample size (n) = 6 2= 1 h Edi= 7 / 2 = 1.1667 zla:-))? 27.13 d a) This is a problem of (B) matched pairs samples, Reason: first son born sample and Second born sample are dependent. The 957 difference confidence interval for the mean first-born second-born born aggression aggression minus salin a z roofs, at 51.1667 +25706x1 7.73 F1.46671 8.1121 € (-6,9454, 9.2788 Lower bound=-6.9 eppes bound 9.3 and e Arsi