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:

Polarities

Opposing or contrasting forces or perspectives that exist in relation to each other, often creating a dynamic balance or conflict.

Personality Type

A categorization of an individual's behavioral patterns, emotional responses, and thinking styles.

Ego

In psychoanalytic theory, the part of the personality responsible for dealing with reality, mediating between the desires of the id and the morals of the superego.

Self

Refers to the individual's awareness of their own identity, traits, feelings, and behaviors, central to various psychological theories and self-concept development.