Does room temperature affect cognitive function A psychologist randomly divides 60 volunteers into two groups. One group of 30 solves a erossword puzzle in a room kept at 72 °F, the other group of 30...

Extracted text: Does room temperature affect cognitive function A psychologist randomly divides 60 volunteers into two groups. One group of 30 solves a erossword puzzle in a room kept at 72 °F, the other group of 30 solves the puzzle in arocm kept-at 85 °F The mean completion time (x1) for the subjects in the "cool" room is 20 minutes-and the standard deviation is s =6 minutes. The mean (x) for the subjects in the "warm" room is 26 minute and the standard deviation is s 8 minutes. Let h and th represent the mean completion times for all potențial volunteers similar to the ones in this study when they are in "cool" or "warm" reoms, respectively. Using technology, which of the following is a 99% confidence interval for th-u? a. (-15.09, 3.09) b. %3D (-10.88, -1.12) c. (-9.80,-1.57) d. (-9.56,-2.44) e. (-7.82,-4.18) Which of the following describes a situati on in which it is safe to employ t procedures? n=10, n2 = 40; both samples are moderately skewed. b. nį=10, n2 = 8; sample 1 is approximately Normal, while ample 2 is skewed to the right. c. m=6, m = 6; both samples are approximately Normal. d. m=35, n2 = 40; both samples are approximately Normal, sample 2 has two outliers. It is safe to use t procedures in more than one of the situations above. a. %3D %3D с. %3D e. An advertising firm is comparing two different 30-second television ads for a new mobile phone. A