Instruction 10-13 to Investigate the Efficacy of a Diet,a Random Sample of Sample

question 26

Short Answer

Instruction 10-13
To investigate the efficacy of a diet,a random sample of 16 male patients is drawn from a population of adult males using the diet.The weight of each individual in the sample is taken at the start of the diet and at a medical follow-up 4 weeks later.Assuming that the population of differences in weight before versus after the diet follow a normal distribution,the t-test for related samples can be used to determine if there was a significant decrease in the mean weight during this period.Suppose the mean decrease in weights over all 16 subjects in the study is 3.0 kilograms with the standard deviation of differences computed as 6.0 kilograms.
-Referring to Instruction 10-13,there are ________ degrees of freedom for this test.

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Definitions:

Adventitia

The outermost layer of the wall of a blood vessel or other organ, consisting mainly of connective tissue, providing structural support and protection.

Serosa

The outermost layer of tissue that envelops some internal organs, part of the lining of the body cavities and a structure involved in protection and secretion.

Submucosa

A layer of tissue beneath the mucosa, containing blood vessels, nerves, and lymphatics, supporting the mucosa.

Plicae Circularis

Plicae circulares are circular folds of the inner lining of the intestine, which increase the surface area for absorption of nutrients.