1. At Middletown High, a coefficient of correlation of-0.60 was found between th
ID: 2927348 • Letter: 1
Question
1. At Middletown High, a coefficient of correlation of-0.60 was found between the number of high-school activities offered and the number of drug-related suspensions. What percent of drug-related suspensions is explained by factors other than high-school activities? o A. 36% o B. 40% o C. 60% o D. 64% 2. Scatter plot can be used to study - A. direction of association between gender and income B. percentage variation of association between gender and income C. strength and direction of association between minutes doing exercise and body fat percentage - D. All of the above 3. In a government study of the relationship between the number of passengers on an aircraft and the total weight in kg of luggage stored in the aircraft's baggage compartment, the coefficient of correlation is computed to be 0.8. We can, therefore, conclude that A. 80% of the variation in the weight of luggage is explained by the number of passengers B. 20% of the variation in the weight of luggage is explained by the number of passengers C. 64% of the variation in the weight of luggage is explained by the number of passengers D. 36% of the variation in the weight of luggage is explained by the number of passengers . 4. What does a -0.8 correlation coefficient between the dependent variable y and the independent variable x indicate? A. There is strong negative correlation between these two variables. B. There is almost no correlation between these two variables. C. Changes of variable y is strongly caused by changes of variable x. D. None of the above -Explanation / Answer
1. Coefficient of determination = (-0.60)2 = 0.36
Hence,
36% of the variation can be explained.
Option A is correct.
2. Option A is correct.
3. Option C is correct.
4. Option A is correct.
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