A Researcher Wants to Study the Effects of Physical Exercise

question 53

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 relevant number of degrees of freedom is ______.

• A) 1
• B) 2
• C) 3
• D) 23
• E) 24

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Definitions:

Expected Return

The anticipated average return of an investment over a given period, factoring in all possible outcomes.

Portfolio Return

The overall gain or loss generated by an investment portfolio over a particular period of time, taking into account both capital gains and income received.

Expected Return

The anticipated average return from an investment based on its probable profits.

Recession

A period of temporary economic decline during which trade and industrial activity are reduced, generally identified by a fall in GDP in two successive quarters.