Question: It is recommended to keep cholesterol levels equal to or less than 2 0 0 mg / dl . Researchers took a sample of 2

It is recommended to keep cholesterol levels equal to or less than 200 mg/dl. Researchers took a sample of 20 adults from a population and found the mean cholesterol level to be 311, with a standard deviation of 64. Do we have evidence to reject or retain the null hypothesis (i.e. that this group has a cholesterol level equal to or less than 200 mg/dl) at a 5% significance level?

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