Homework 3 2023

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Western Michigan University *

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Psychology

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Feb 20, 2024

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Homework 3 1. Suppose the covariance between agreeableness and conscientiousness was -4 and the standard deviation for introversion was 6 and the standard deviation for openness was 6. (5 Points) a. What does the covariance describe in this context? (2 Points) b. What is the correlation between agreeableness and conscientiousness (3 Points) 2. You are interested in measuring IQ scores for individuals. You know that the average IQ score is 100, and the standard deviation of IQ scores is 15. Find the Z scores for the following IQ scores (10 points) a. 105 b. 85 c. 135 d. 75 e. 100 3. Suppose you took measures on a novel IQ test with mean 60 and standard deviation 10 and wanted to compare an individuals score to a standard IQ test (mean = 100, standard dev = 15). What would a score of 75 on the novel IQ score be equivalent to on the standard IQ test? Show all work for full credit OR explain how you found the answer. (5 points). 4. Suppose you were interested in making a comparison between people who really enjoy ice cream and people who really hate ice cream on a measure of agreeableness. However, one issue you ran into was the fact that you had trouble finding enough people who disliked eating ice cream. What sampling method would be appropriate to sample both people who enjoy eating ice cream that is also able to allow you to sample enough people who dislike ice cream? (5 Points)

5. A psychologist is interested in collecting data on whether people perform better on tests in either hot rooms or cold rooms and recruits participants to do so using unbiased simple random sampling. This research has been conducted and successfully replicated many times in the past. To measure temperature in each room, the psychologist simply asks participants if the room feels hot or cold and has no idea what the actual temperature is in either room. The temperature in the hot room becomes dangerously hot during the day and leaves several participants with heat exhaustion. Fully describe at least one issue with this prompt using FINERMAPS (5 Points).

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