null hypothesis or alternative hypothesis

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Question description

Blood glucose levelsfor obese patients have a mean of 98 mg/dl with astandard deviationof 14.2 mg/dl. A researcher thinks that a diet high in raw cornstarch will have a positive effect on blood glucose levels. A sample of 28 patients who have tried the raw cornstarch diet have a mean glucose level of 103.4 mg/dl. 

What steps would you change if instead, we wanted to test whether the diet high in raw cornstarch will have a positive or negative effect? Specify what steps you would change and how?

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