Question: First test and final exam. How strong is the relationship between the score on the first test and the score on the final exam in

First test and final exam. How strong is the relationship between the score on the first test and the score on the final exam in an elementary statistics course? Here are data for eight students from such a course: First-test score 153 144 162 149 127 158 158 153 Final-exam score

(a) Do you think that one of these variables should be an explanatory variable and the other a response variable? Give reasons for your answer.

(b) Make a scatterplot and describe the relationship.

(c) Find the correlation.

(d) Give some possible reasons why this relationship is so weak.

First-test score 153 144 162 149 127 158 158 153 Final-exam score 145 140 145 170 145 175 170 160

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