The slope must become less The slope would not change The correlation must becom

Question

The slope must become less The slope would not change The correlation must become lower The slope must become greater In the scatterplot of Question 2. The correlation between X and Y is closest to: -0.96 -0.55 0.55 0.96 For human women, a pregnancy lasts about 9 months. For other animals, the gestation period (average length of pregnancy) is different. A researcher believes that longer-lived animals generally have longer gestation periods. The researcher measured life expectancy in years and gestation period in days, and did a regression for predicting gestation period from life expectancy. The regression line had intercept -39.5 and slope 15.5, with an R-squared of 72.2%. Use this information for this question and the following two. What is the predicted gestation period, in days, for an animal with life expectancy 10 years? 115 200 3 89 Would you guess that your prediction in Question 25 was reasonably accurate or not, based on the information given in that question? no, because the slope is small. yes, because the slope is positive. no, because we must have been extrapolating. yes, because R-squared is quite high. no, because R-squared is low. Humans have an average life expectancy of 80 years and their gestation period is 280 days. Using the information in Question 25, what is the residual when using that regression equation to predict human gestation period from human life expectancy? 0 -500 500 920 -920

Explanation / Answer

(25) a

(26) d

(27) e

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