Kerry and Danielle wanted to investigate if tapping on a can of soda would reduce the amount of soda expelled after the can has been shaken. For their experiment, they vigorously shook 40 cans of soda and randomly assigned each can to be tapped for 0 seconds, 4 seconds, 8 seconds, or 12 seconds. After opening the cans and waiting for the fizzing to stop, they measured the amount expelled (in milliliters) by subtracting the amount remaining from the original amount in the can. Here are their data:

Here is some computer output from a least-squares regression analysis of these data. Construct and interpret a 95% confidence interval for the slope of the true regression line.

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Amount expelled (mL) (0 sec) (4 sec) (8 sec) (12 sec) 110 95 88 80 100 105 84 75 105 105 87 80 105 105 85 75 105 95 79 70 110 90 100 65 107 88 85 71 105 95 85 77 104 94 80 76 106 96 80 75