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Quiz3copy2Spring

# Quiz3copy2Spring - this recommendation 3 A taxi company...

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Name: Statistics and Probability (Math 80) Quiz #3 (Chapters 7 and 8) . 1. After conducting a survey at a pet store to see what impact having a pet had on the condition of the yard, a news reporter stated "There appears to be a strong correlation between owning a pet and the condition of the yard." What does your statistics teachers NOT like about that comment? 2. A study by a prominent psychologist found a moderately strong positive association between the number of hours of sleep a person gets and the person's ability to memorize information. a. Explain in the context of this problem what "positive association" means (using the context from this problem refers to hours of sleep and ability to memorize) b. Hoping to improve academic performance, the psychologist recommended the school board allow students to take a nap prior to any assessment. Why is your statistics teacher skeptical of

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Unformatted text preview: this recommendation? 3. A taxi company monitoring the safety of its cabs kept track of the number of miles tires had been driven (in thousands) and the depth of the tread remaining (in rnm) and computed the regression line for the data collected. The regression line is: jj = -0.5~ + 35, where x is the miles driven and y is the tread remaining and r = -0.9 . a. Describe the association (remember to include all 3 ways we describe it). # b. Explain what the slope of the line means. (in context means, using the context of the problem - tread and miles should be included.) :. What does a positive residual mean in this context? (in context means, using the context of the problem - tread and miIes should be included.)...
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