1. Let's say the National Center for Health Statistics (NCHS) reports the mean BMI for adults is 23.5 (comparator). Is the mean BMI for adults in a hypothetical Heart Study significantly different? In 300 participants the mean is 20with a standard deviation of 3.5.

1. What kind of an outcome is this? What kind of a sample is this?
2. Set up the null and research hypotheses
3. Select the test statistic
4. Set up the decision rule
5. Compute the test statistic using Excel