A Researcher Is Interested in Testing to Determine If the Mean

question 62

Multiple Choice

A researcher is interested in testing to determine if the mean of population one is greater than the mean of population two.The null hypothesis is that there is no difference in the population means (i.e. ,the difference is zero) .The alternative hypothesis is that there is a difference (i.e. ,the difference is not equal to zero) .He randomly selects a sample of 9 items from population one resulting in a mean of 14.3 and a standard deviation of 3.4.He randomly selects a sample of 14 items from population two resulting in a mean of 11.8 and a standard deviation 2.9.He is using an alpha value of .10 to conduct this test.Assuming that the populations are normally distributed,the degrees of freedom for this problem are ___.

• A)23
• B)22
• C)21
• D)1
• E)2

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Definitions:

Downward Social Comparison

Comparing oneself to others who are perceived as less fortunate or less successful, often to boost self-esteem or subjective well-being.

Distressful Events

Incidents or situations that cause extreme anxiety, sorrow, or pain, potentially leading to significant psychological or physical impact.

Affiliation

The connection or association with a group, organization, or cause, often determined by shared interests, goals, or identities.

Complementarity Hypothesis

A theory suggesting that positive responses elicit positive reactions and negative responses elicit negative reactions during interpersonal interactions.