In a study to determine whether the frequency of a certain mutant gene increases with age, the number of mutant genes per microgram of DNA was counted for each of 29 men. The results are presented in the following table.

a. Compute the least-squares regression line for predicting number of mutants from age.

b. Construct a scatterplot of number of mutants (y) versus age (x).

c. Which point is an outlier?

d. Remove the outlier and compute the least-squares regression line for predicting number of mutants from age.

e. Is the outlier influential? Explain.

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Number of Age Mutants Age Number of Mutants 44 100 53 49 46 52 80 41 43 93 57 66 46 193 59 109 45 77 65 264 53 35 68 69 58 105 47 29 54 68 61 101 68 71 61 148 55 82 70 78 55 267 70 195 51 43 72 83 52 181 82 449 57 29 83 202 52 58