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Mathematics, 11.12.2019 02:31 monkeys450

Dr. christina cuttleman, a nutritionist, claims that the average number of calories in a serving of popcorn is 75 with a standard deviation of 7. a sample of 50 servings of popcorn yields an average of 78 calories.
a. should z test or t test be used?
b. check dr. cuttleman's claim at a = 0.05.

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