DSRT 734 - Mid Term Exams-Question and Answer

DSRT 734 - Mid Term Exams-Question and Answer 1. The following table illustrates the BMI for a number of patients recently enrolled in a study investigating the relationship between BMI and type 2 diabetes. Participan t BMI (kg/m2) A 26.5 B 19.2 C 29.7 D 27.4 E 30.2 F 28.9 A) Assuming the participants can be considered to be normally distributed, and that they come from a population with a σ=2.4 kg/m2, calculate a 95% confidence interval for the mean BMI of the population for which they represent. (25.062, 28.903) B) Correctly interpret the confidence interval you found above. The interval reveals that the probability of fiunding the mean in this interval is 0.95. This can be interpreted to mean that with 95% confidence, the mean BMI wil lie in this interval. 2. Suppose the following table illustrates the ages for a number of participants projected to enroll into a clinical trial looking at early onset of dementia. Patien t Ag e A 64 B 57 C 58 D 53 E 71 F 54 G 63 A) Assuming that these participants can be considered to be normally distributed, and that they come from a population with a σ=4.3 years, calculate a 99% confidence interval for the mean age of the population for which they represent.