Statistics: Testing Hypothesis with the t-statistic – #735


Question: Car gets mean of 18mpg. Test see if cheaper grade of gasoline made difference in gas miles at .01 level. Sample of 38 fill ups with cheaper gas got mean of 17.8mpg and standard deviation of 0.6. State hypotheses and identify claim, find critical value(s), compute test value, made decision, summarize results.

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