ex_0516

# ex_0516 - Exercise on May16 1 Which of the following...

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Exercise on May16 1. Which of the following situations has the most obvious explanatory and response variables? A) The weight and height of a person. B) The amount of yearly rainfall and the yield of a crop. C) A student’s grades in statistics and in French. D) The occupational class of a father and of a son. 2. Which of the following statements makes most sense? A) There is a high correlation between workers born in December and the number of vacation days they take in December. B) We found a low correlation ( r = 0.19 ) between the number of sick days claimed each month and a person’s age. C) The correlation between planting rate and yield of beans was found to be 0.23 bushels. D) Students’ ratings of courses were found to be highly correlated with the day of the week that surveys were administered. 3. Question 1: Calculate the correlation coefficient for the following variables:

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X 2 5 9 12 18 Y 22 20 19 17 12 A) 0.9815 B) 20.53 C) – 0.9815 D) – 0.60
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ex_0516 - Exercise on May16 1 Which of the following...

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