Quiz-3-Solutions.docx - Quiz#3(Unit 4 and 13 Please Show Work when possible(If you don’t I can’t give you partial credit 1(15 pts Researchers at the

# Quiz-3-Solutions.docx - Quiz#3(Unit 4 and 13 Please Show...

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Quiz #3 (Unit 4, modules 11, 12 and 13) Please Show Work, when possible! (If you don’t, I can’t give you partial credit!) 1. (15 pts.) Researchers at the University of Denver Infant Study Center investigated whether babies take longer to learn to crawl in cold months (when they are often bundled in clothes that restrict their movement) than in warmer months. The study sought an association between babies’ first crawling age (in weeks) and the average temperature during the month when the baby is 6 months old. Parents reported the birth month and age at which their child was first able to crawl a distance of 4 feet in one minute. The graph below plots average crawling ages (in weeks) against the mean temperatures when the babies were 6 months old. The accompanying chart describes the data. a) (3 pts.) Describe the association. Strength: Moderately strong (r = -0.72, closer to -1) Direction: Negative Form: Linear b) (5 pts.) Find the equation of the regression line. Keep AT LEAST 4 decimals in your approximations!!! Your final answer should be approximately: ^ y = 35.8290 0.0798 x . Since I’m giving you the answer, I expect to see your work. No work = no credit.

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