Recall Exploration 7.1 and Example 7.2 about the time needed to round first base using the narrow angle versus the wide angle. Th e previous exercise reports the summary statistics for the difference in times (narrow ˆ’ wide).
a. Use the formula of the standardized statistic

calculate its value. Interpret the value of the standardized statistic in the context of the study.
b. Use the formula for the confidence interval

to calculate the 95% confidence interval.

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