PSY 215 Problem Set 5 20 total points Answer each of the following questions. When possible, responses for can be typed, and problem solutions can either be completed on computer, or written out by...

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PSY 215 Problem Set 5 20 total points Answer each of the following questions. When possible, responses for can be typed, and problem solutions can either be completed on computer, or written out by hand and scanned using your smartphone or a scanner. 1. Describe how the shape of a scatterplot changes when comparing (a) positive and negative correlations and (b) strong and weak correlations. Draw examples to help illustrate your descriptions. (2 points) 2. A researcher finds that people with high self-esteem tend to exercise more than people with low self-esteem. Explain the directionality problem and how it could influence the interpretation of this correlation. (1 point) 3. A researcher finds that children who play lots of video games also tend to be aggressive with their peers at school. Explain the third variable problem and how it could influence the interpretation of this correlation. (1 point) 4. For the variables listed, indicate whether you would expect a positive, negative, or zero correlation. (2 points) a. Basketball skills and typing skills b. Furnace fuel consumption and outdoor temperature c. High school GPA and college GPA d. Body weight and intelligence 5. Students who have taken courses in both areas are asked to rate on a 10-point scale how much they like math and how much they like statistics. The ratings for 10 random students appear below. Calculate a Pearson r to determine if there is a tendency for those who like math to like statistics also. (8 points) Student Math Statistics 1 2 3 4 5 6 7 8 9 10 7 8 2 9 3 5 6 0 4 8 5 4 0 3 1 6 7 1 3 2 a. State the null and alternative hypotheses. b. Locate the critical region – determine rcritical (α = .05, two-tailed). c. Compute the Pearson r. d. Make a decision about Ho and state a conclusion in the standard format. 6. A psychology instructor asked each student to report the number of hours he or she spent preparing for an exam. In addition, the instructor recorded the number of errors made on each student’s exam. Calculate a Spearman’s rho to determine if there is relationship between study hours and errors (8 points). The data are as follows: Student Hours Errors 1 2 3 4 5 6 7 8 0 1 2 4 4 5 3 5 19 6 2 1 4 0 3 5 a. State the null and alternative hypotheses. b. Locate the critical region – determine ρcritical (α = .05, two-tailed). c. Compute the Spearman’s ρ. d. Make a decision about Ho and state a conclusion in the standard format. PSY 215 Problem Set 5 20 total points A nswer each of the following questions . When possible, r esponses for can be type d, and p roblem solutions can either be completed on computer, or written out by hand and scanned using your smartphone or a scanner . 1. Describe how the shape of a scatterplot changes when comparing (a) positive and negative correlations and (b) strong and weak correlations. Draw examples to help illustrate your descriptions. (2 points) 2. A researcher finds that people with high self - esteem tend to exercise more than p eople with low self - esteem. Explain the directionality problem and how it could influence the interpretation of this correlation. (1 point) 3. A researcher finds that children who play lots of video games also tend to be aggressive with their peers at school. Explain the third variable problem and how it could influence the interpretation of this correlation. (1 point) 4. For the variables listed, indicate whether you would expect a positive, negative, or zero correlation. (2 points) a. Basketball skills and typing skills b. Furnace fuel consumption and outdoor temperature c. High school GPA and college GPA d. Body weight and intelligence 5. Students who have taken courses in both areas are asked to rate on a 10 - point scale how much they like math and how much they like statistics. The ratings for 10 random students appear below. Calculate a Pearson r to determine if there is a tendency for th ose who like math to like statistics also. (8 points) PSY 215 Problem Set 5 20 total points Answer each of the following questions. When possible, responses for can be typed, and problem solutions can either be completed on computer, or written out by hand and scanned using your smartphone or a scanner. 1. Describe how the shape of a scatterplot changes when comparing (a) positive and negative correlations and (b) strong and weak correlations. Draw examples to help illustrate your descriptions. (2 points) 2. A researcher finds that people with high self-esteem tend to exercise more than people with low self-esteem. Explain the directionality problem and how it could influence the interpretation of this correlation. (1 point) 3. A researcher finds that children who play lots of video games also tend to be aggressive with their peers at school. Explain the third variable problem and how it could influence the interpretation of this correlation. (1 point) 4. For the variables listed, indicate whether you would expect a positive, negative, or zero correlation. (2 points) a. Basketball skills and typing skills b. Furnace fuel consumption and outdoor temperature c. High school GPA and college GPA d. Body weight and intelligence 5. Students who have taken courses in both areas are asked to rate on a 10-point scale how much they like math and how much they like statistics. The ratings for 10 random students appear below. Calculate a Pearson r to determine if there is a tendency for those who like math to like statistics also. (8 points)