Exercises 14

1. Explain the difference between an observational and an

experimental study.

2. Name and define the three types of observational studies.

In Exercises 1922, identify the independent variable and the dependent variable.

19. According to the British Journal of Sports Medicine, a regular 30-minute workout could slash your risk of catching a cold by 43%.

20. The Journal of Behavioral Medicine reported that sharing a hug and holding hands can limit the physical effects of stress such as soaring heart rate and elevated blood pressure.

21. A study was conducted to determine whether when a restaurant server drew a happy face on the check, that would increase the amount of the tip.

22. A study was conducted to determine if the marital status of an individual had any effect on the cause of death of the individual