#5. In a research study, questionnaires were mailed to every 10th person listed
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#5. In a research study, questionnaires were mailed to every 10th person listed in the city telephone directory. Each person was asked to list age, sex, smoking habits, and respiratory symptoms during the preceding seven days. Over 90% of the questionnaires were completed and returned. Prevale This is a ence rates of upper respiratory symptoms were determined from the response. type of study. 3 pts.) #6. In a study to investigate the relationship between obesity and diabetes 75 pairs of twins recruited where one twin was diabetic. They were then classified as Obese (BMI Obese (BMI S 30) with data shown below. were -30) or Not (6 pts.) Non-Diabetic Obese Non-Obese Obese 48 Diabetic Non-Obese 16 (a) Do these data support a relationship between Obesity and Diabetes? Interpret your results (b) Instead of 75 pairs of twins, if our data came from 150 unrelated individuals, would we come to the same conclusion? Support your conclusion with an unmatched analysis. Was the recruitment of twins useful for this study?Explanation / Answer
The contingency table below provides the following information: the observed cell totals, (the expected cell totals) and [the chi-square statistic for each cell].
The chi-square statistic, p-value and statement of significance appear beneath the table.
The chi-square statistic is 31.8775. The p-value is < .00001. The result is significant at p < .05. So there is a relationship between obese and diabetes
b)
No, we cannot come to same conclusion with unrelated individuals.
Results obese Non obese Row Totals Obese 3 (12.92) [7.62] 48 (38.08) [2.58] 51 Non obese 16 (6.08) [16.19] 8 (17.92) [5.49] 24 Column Totals 19 56 75 (Grand Total)Related Questions
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