Discussion:
Q: Recent recommendations suggest 60 minutes of physical activity per day. A sample of 50 adults in a study of cardiovascular risk factors report exercising a mean of 38 minutes per day with a standard deviation of 19 minutes. Based on the sample data, is the physical activity significantly less than recommended? Run the appropriate test at a 5% level of significance.
What is the effect of the choice of alpha on the results of the study? For what type of study would you choose the alpha level of .01? of .05? of.10?