Question: Second test and final exam. Refer to the previous exercise. Here are the data for the second test and the final exam for the same

Second test and final exam. Refer to the previous exercise.

Here are the data for the second test and the final exam for the same students: Second-test score 158 162 144 162 136 158 175 153 Final-exam score

(a) Explain why you should use the second-test score as the explanatory variable.

(b) Make a scatterplot and describe the relationship.

(c) Find the correlation.

(d) Why do you think the relationship between the second-test score and the final-exam score is stronger than the relationship between the first-test score and the final-exam score?

Second-test score 158 162 144 162 136 158 175 153 Final-exam score 145 140 145 170 145 175 170 160

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