Recall the regression of weight on age from Exercise 11-2.

(a) Estimate the error standard deviation.

(b) Estimate the standard deviation of the slope.

(c) What is the value of the t-statistic for the slope?

(d) Test the hypothesis that β₁ = 0 at α = 0.05. What is the P-value for this test?

Exercise 11-2

On average, do people gain weight as they age? Using data from the same study as in Exercise 11-1, we provide some summary statistics for both age and weight.

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ix = 543503.00 =11211.00 i=l Ey = 8110405.02 Ey = 44520.80 i=1 i=1 Ex;y; = 1996904.15 i=1