cal of statis- selise 21-34. What\'s the design? Read each brief report tical re

Question

cal of statis- selise 21-34. What's the design? Read each brief report tical research, and identify a) whether it was an observational study or an experiment. If it was an observational study, identify (if possible) b) whether it was retrospective or prospective. c) the subjects studied and how they were selected. d) the parameter of interest. e) the nature and scope of the conclusion the study can reach. lf it was an experiment, identify (if possible) b) the subjects studied. c) the factor(s) in the experiment and the number of levels for each. d) the number of treatments. e) the response variable measured. the design (completely randomized, blocked, or matched). g) whether it was blind (or double-blind). h) the nature and scope of the conclusion the experiment can reach

Explanation / Answer

It is an experiment and not an observational study since actual experiment is conducted.

Subjects: volunteers (40 of them) suffering from insomnia.

Factors: 2 - diet and exercise, each at 2 levels - diet with 2 deserts, normal diet; exercise, no exercise.

Number of treatments: 2 - diet and exercise

Response variable measured: An indicator of insomnia - could be number of hours of sleep per day.

Design: Randomised Block Design - treating diet as blocks. Could also be viewed as a (22) factorial design.

Design is blind.

Conclusions possible:

1. If specific diet leads to significant relief from insomnia (i.e., increases number of hours of sleep)

2. If doing exercise can show significant improvement in insomnia level

3. If in combination, diet and exercise together has a better effect on insomnia (interaction effect).

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