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Homework_1_Solutions

# Homework_1_Solutions - Homework 1 Solutions 1.1 a The...

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Homework 1 Solutions 1.1 a. The median height is 65 inches. b. Range = Tallest – Shortest = 71 – 59 = 12 inches. c. The interval from 59 to 63.5 inches contains the shortest 1/4 of the women. This interval is from the minimum to the lower quartile. d. The interval from 63.5 to 67.5 inches contains the middle 1/2 of the women. This is an interval from the lower quartile to the upper quartile. 1.7 a. Randomized experiment. b. Observational study. c. Randomized experiment. d. Observational study. 1.8 a. Number of courses might be a confounding variable. Students taking many courses may sleep less due to the amount of work involved and may not do as well in school due to the load. b. Not likely to be a confounding variable. Weight is probably not related either to amount of sleep or to grades. c. Hours spent partying might be a confounding variable. Students who party a lot may sleep less, and may also get lower grades because they’re not studying. 1.12 a. The population is all University of California faculty members in 1995.

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