The effect of a different point. Examine the data in Exercise 4.41 and add a ninth student who has low scores on the second test and the final exam and fits the overall pattern of the other scores in the data set. Calculate the correlation and compare it with the correlation that you calculated in Exercise 4.41. Write a short summary of your findings.
Exercise 4.41
Second test and final exam. In Exercise 4.25 you looked at the relationship between the score on the second test and the score on the final exam in an elementary statistics course. Here are the data:
(a) Find the correlation between these two variables.
(b) Do you think that the correlation between the first test and the final exam should be higher than, approximately equal to, or lower than the correlation between the second test and the final exam? Give a reason for your answer.