Carol is studying dieting behaviours and media

| March 14, 2016

Question
Carol is studying dieting behaviours and media consumption in teenage girls. She randomly selects a sample 45 adolescents from a local high school to participate in her study. The questionnaire that she uses to assess “dieting behaviours” has a known mean for the general population (those >16 years old in the US) of 60 and standard deviation of 7. Her results show that the same has a mean of 71, and a standard deviation of 3.

What is the standard error of the mean?

Calculate the confidence intervals for Carol’s study using a 95% confidence level.

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