Dave the jogger runs the same route every day (about 2.2 miles). On 18 consecutive days, he recorded the number of steps using a pedometer. The results were

(a) Construct a 95 percent confidence interval for the true mean number of steps Dave takes on his run.
(b) What sample size would be needed to obtain an error of ±20 steps with 95 percent confidence?
(c) Using Excel, plot a line chart of the data. What do the data suggest about DaveSteps the pattern over time?

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