# EconReview2 - Question#1 Which of the following are...

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Question #1 Which of the following are measures of the linear relationship between two variables? ( Hint: 2 correct answers ) The covariance The standard deviation The coefficient of correlation The variance Generally speaking, if two variables are unrelated, the covariance will be ( Hint: 1 correct answer ): a larger negative number than if they were related closer to 1 than if they were related a smaller positive number than if they were related a smaller positive or smaller negative number than if they were related a larger number than if they were related a positive number close to zero Item 1: You made all of the correct selections. Item 2: You made all of the correct selections. You received a raw score of 100% on this question. Question #2 According to a recent study, kids aged 12 to 17 watched an average of 3 hours of television per day. Suppose that the standard deviation is 1 hour and that the distribution of the time watching television has a bell-shaped distribution. Answer the following questions relying only on the Empirical Rule. What percentage of kids aged 12 to 17 watches television between 2 and 3 hours per day? 34% What percentage of kids aged 12 to 17 watches television between 1 and 4 hours per day? 81.5% What percentage of kids aged 12 to 17 watches television more than 4 hours per day? 16% You received a raw score of 100% on this question.

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