A Researcher Is Interested in Testing to Determine If the Mean

question 19

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)2
• E)1

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Definitions:

Oral Stage

The first stage in Freud's psychosexual development theory, occurring in the first year of life, where pleasure is centered on oral activities such as sucking and eating.

Fixated

Obsessively focused or attached to someone or something in an immature psychological state.

Gullible

A tendency to be easily deceived or tricked, often due to a lack of skepticism or the desire to believe what one is told.

Preconscious

Mental activities and information not currently in conscious awareness but that can be easily recalled or accessed.