A Researcher Wants to Study the Effects of Physical Exercise

question 76

Multiple Choice

A researcher wants to study the effects of physical exercise on depression.She randomly selects a group of 24 individuals who are equally depressed.None of these individuals currently exercises.She then randomly assigns them in one of three groups: group 1 stays without exercising (sedentary group) ,group 2 exercises once a week,and group 3 exercises two times a week.Individuals in groups 2 and 3 meet with a personal trainer so they carry out a very similar exercising program,both in kinds of exercises and in intensity.After two months,the researcher has all individuals take a depression-assessment test.The score of the test goes from 0 = totally miserable to 100 = complete satisfaction. The scores are shown in the following table:
The researcher uses a Kruskal-Wallis test and a significance level α = 0.05.The observed K statistic is ______.

• A) 10.16625
• B) 10.7525
• C) 11.16625
• D) 12.7525
• E) 13.16625

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Definitions:

Conception

Conception is the process of a sperm fertilizing an egg, leading to the beginning of pregnancy.

Syphilis

A sexually transmitted infection caused by the bacterium Treponema pallidum, characterized by distinct phases and potentially serious health consequences if left untreated.

Thalidomide

A sedative linked to birth defects, especially deformed or absent limbs.

BMI

Body Mass Index, a measure of body fat based on height and weight that applies to adult men and women, used to categorize underweight, normal weight, overweight, and obesity.