You attend a professional presentation on obesity and television watching. The presenter surveyed 30 people (15 men and 15 women) from Palmera community regarding their television viewing habits, weight, and eating habits. He calculated a correlation (r = .21, p < .05) between participants' weight and the number of hours they watched TV on a weekly basis. He also reported that the mean weight for men was 254 lbs (SD = 8.33) and the mean weight for women was 179 lbs (SD = 1.67). He does not conduct a test to determine if the difference in weight is statistically different among men versus women. The presenter concludes the presentation by stating that watching TV causes weight gain in Palmera's residents and that men in Palmera weigh more than women in Palmera.

• What is wrong with the presenter's conclusions?
• What does the difference in the sizes of the standard deviations for the mean weight among the men and women indicate?
• Why is it important to always report a standard deviation when reporting a mean?
• What limitations were present in the methodology of the study?
• Discuss three specific recommendations you have for improving the study?