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Assignment Stats 250 W11 HW 9 Required Assignment Stats 250 W11 HW 9 Question 1 (Chapter 14) Correlation: Match each of the three graphs (A – C) below to one of three possible correlations: r = 0.4, r=0, r=-0.9 1. Graph A: r = 0.4, Graph B: r = 0, Graph C: r = -0.9 2. Graph A: r = 0.4, Graph B: r = -0.9, Graph C: r = 0 3. Graph A: r = 0, Graph B: r = -0.9, Graph C: r = 0.4 4. Graph A: r = 0, Graph B: r = 0.4, Graph C: r = -0.9 5. Graph A: r = -0.9, Graph B: r = 0, Graph C: r = 0.4 6. Graph A: r = -0.9, Graph B: r = 0.4, Graph C: r = 0 Solution: 6. Graph A: r = -0.9, Graph B: r = 0.4, Graph C: r = 0 Question 2 (Chapter Crawling Age for Babies. Researchers at an Infant Study Center wondered whether temperature might influence age at which babies learn to crawl. Perhaps the extra clothing that babies wear in cold weather would restrict movement and delay the age at which they started crawling. Data were collected on infant boys and girls. Parents reported the month of the baby’s birth and the age (in weeks) at which their child first crawled. The table below gives the average Temperature (°F) when the babies were 6 months old and the average Crawling Age (in weeks) for each month of the year. A scatterplot and a regression analysis were completed with SPSS and shown below. Model Summary Model R R Square Adjusted R Square Std. Error of the Estimate 6- Average 4/17/2011 www.lecturebook.com/homeworks/sho… lecturebook.com/homeworks/show/49 1/9

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