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September 23, 2014

Homework Help: Statistics/Confidence Intervals

Posted by melanie on Saturday, June 21, 2008 at 2:34pm.

Over the last 15 Major League Baseball seasons, the mean # of strikeouts by the American League leader is 258.5. Assuming that the # of strikeouts by the league leader is normally distributed and the st. dev. for all seasons in all leagues is 34.9, find the 82% Confidence Interval and the 93% Confidence Interval for the mean.

I get that the 82% would be 1-.82=.18 & 93% would be 1-.93=.07 and that n=15, x-bar=258.5, & st. dev=34.9. But I'm confused about the formula. Would I be using a t-distribution?

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