Question
Sample of n = 200 adolescents aged 13-15 years are enrolled in a study that gather data on daily food intake through detailed food diaries.
Sample of n = 200 adolescents aged 13-15 years are enrolled in a study that gather data on daily food intake through detailed food diaries. In the sample Chicago adolescents consumed a mean of 15.6% and standard deviation of 33.5% of calories from added sugars. Current dietary guidelines recommend that added sugars be kept to less than 10% of total caloric intake. Is there statistical evidence of a difference from the recommended 10% of calories from added sugars among Chicago adolescents? Please specify your null hypothesis, research hypothesis, and significance level. Compute the t statistic and p-value based on sample data. What is the degrees of freedom for the t statistic? (hint: use t.dist.2t function in EX CEL for two sided p-value) and compare your p-value and the pre-determined significance level, which is larger, which is smaller? What would you conclude the results for your hypothesis?
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