Mean number of calories in popcorn

Reference no: EM13110297

In an article appearing in Today's Health a writer states that the average number of calories in a serving of popcorn is 75. To determine if the average number of calories in a serving of popcorn is different from 75, a nutritionist selected a random sample of 20 servings of popcorn and computed the sample mean number of calories per serving to be 78 with a sample standard deviation of 7.

Assistance is needed with null and alternative hypotheses, the Z value, and if there is enough evidence to support the writers claims.

Reference no: EM13110297

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