Mathematics, 07.07.2020 14:01 jentho2012
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.
Required:
a. Compute the z or t value of the sample test statistic.
b. At the α = 0.05 level of significance, does the nutritionist have enough evidence to reject the writer's claim?
Answers: 3
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