An advertisement for a cross- country ski machine, NordicTrack, claimed, “In just 12 weeks, research shows that people who used a Nordic- Track lost an average of 18 pounds.” Explain how each of the following components should have been addressed if the research results are fair and unbiased.
a. Component 3: The individuals or objects studied and how they were selected.
b. Component 4: The exact nature of the measurements made or questions asked.
c. Component 5: The setting in which the measurements were taken.
d. Component 6: Differences in the groups being compared, in addition to the factor of interest.