Scatterplots and Regression

• True

• False, the predicted value would be 25.16

• False, the predicted value would be 218.92

• False, the predicted value would be 27.12

• True

• False, the correlation coefficient would be positive.

• False, the correlation coefficient would be zero.

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• 
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The ages (in years) and the number of hours of sleep in one night for 7 adults is shown. Find the correlation.

• -0.95

• 0.95

• 0.90

• -0.90

The ages (in years) and the number of hours of sleep in one night for 7 adults is shown. Find the coefficient of determination (r^2).

• -0.95

• 0.95

• 0.90

• -0.90

The ages (in years) and the number of hours of sleep in one night for 7 adults is shown. What is the equation of the least squares regression line?

The ages (in years) and the number of hours of sleep in one night for 7 adults is shown. What percent of the variability of hours of sleep is described by the linear model with age?

• 95%

• 90%

• 9%

• 10%

The ages (in years) and the number of hours of sleep in one night for 7 adults is shown. Given \(y=-0.09x+10.45\), predict the hours of sleep for someone that is 40 years old.

• 6.85 hours

• -14.05 hours

• -6.85 hours

• 14.05 hours

The ages (in years) and the number of hours of sleep in one night for 7 adults is shown. Given y = -0.09x + 10.45, predict the hours of sleep for someone that is 68 years old.

• 16.57 hours

• -4.33 hours

• -16.57 hours

• 4.33 hours

The ages (in years) and the number of hours of sleep in one night for 7 adults is shown. Given

y = -0.09x + 10.45, predict the hours of sleep for someone that is 87 years old.

• 2.62 hours

• -18.28 hours

• -2.62 hours

• 18.28 hours