A Researcher Wants to Conduct a Before/after Study on 11

question 94

Multiple Choice

A researcher wants to conduct a before/after study on 11 subjects to determine if a new cholesterol medication results in higher HDL cholesterol readings.The null hypothesis is that the average difference is zero while the alternative hypothesis is that the average difference is not zero.Scores are obtained on the subjects both before and after taking the medication.After subtracting the after scores from the before scores, the average difference is computed to be -2.40 with a sample standard deviation of 1.21.A 0.05 level of significance is selected.Assume that the differences are normally distributed in the population.The table t value for this test is _______.

• A)1.812
• B)2.228
• C)2.086
• D)2.262
• E)3.2467

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Definitions:

Experimenter's Friendly Smile

A variable in psychological experiments that can influence participants' responses, potentially introducing bias.

Cold Demeanor

A behavior characterized by emotional detachment, aloofness, or a lack of warmth in interactions with others.

Single-blind Experiment

A type of experiment where the participants do not know which group (control or experimental) they belong to, but the researchers do.

Experimental Group

A group in a scientific study that is exposed to the variable being tested, in contrast to the control group.