Dr Christina Cuttleman, a Nutritionist, Claims That the Average Number $\alpha = 0.05$

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 was found to have an average of 78 calories. Check Dr. Cuttleman's claim at $\alpha = 0.05$ .

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