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A researcher examines whether the clinically anxious individuals differ from people in general in remembering threatening information. The memory performance of an individual for negative words was measured and was found to have a score of 48. The population average is 34 with a standard deviation of 9. At the 5% level of significance what should you conclude about whether clinically anxious individuals have a tendency to remember threatening words?
(a) Clearly state null and research hypotheses in terms of the mean scores on the memory performance on negative words, µ, of anxious individuals.
(b) What is the comparison distribution for the sample's Z score?
(c) What are the cut-off values for a test with significance level 0.05?
(d) What is the observed Z score?
(e) What is your conclusion?
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a. What is the standard deviation of the sample mean if only 10 scores are used?
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An analyst in the publishing industry wants to ?nd out whether the cost of a newspaper advertisement of a given size is about the same in four large newspaper groups. Random samples of seven newspapers from each group are selected, and the cost of..
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