Question

Individuals who consume large amounts of alcohol do not use the calories from this source as efficiently as calories from other sources. One study examined the effects of moderate alcohol consumption on body composition and the intake of other foods. Eighteen subjects participated in a crossover design where they either drank wine for the first 6 weeks and then abstained for the next 6 weeks or vice versa. During the period when they drank wine, the subjects, on average, lost 0.45 kilograms (kg) of body weight; when they did not drink wine, they lost an average of 1.06 kg. The standard deviation of the difference between the weight lost under these two conditions is 8.1 kg. During the wine period, they consumed an average of 2581 calories; with no wine, the mean consumption was 2555. The standard deviation of the difference was 207.

c) One concern with studies such as this, with a small number of subjects, is that there may not be sufficient power to detect differences that are potentially important. Address this question by computing 95% confidence intervals for the two measures and discuss the information provided by the intervals. (Round your answers to three decimal places.)

Weight (  ? kg,   ?   kg)

Caloric intake (   ? calories, ?   calories)

Answer 1