Psy 315 Week 2 Practice Problems

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University of Phoenix Material Week Two Practice Problems Prepare a written response to the following questions. Chapter 2 12. For the following scores, find the mean, median, sum of squared deviations, variance, and standard deviation: 1,112; 1,245; 1,361; 1,372; 1,472 Mean: 1312.4 Median: 1361 Sum of Squared Deviations: 50617.04 Variance: 15217.84 Standard Deviation: 123.3606096 16. A psychologist interested in political behavior measured the square footage of the desks in the official office for four U.S. governors and of four chief executive officers (CEOs) of major U.S. corporations. The figures for the governors were 44, 36, 52, and 40 square feet. The figures for the CEOs were 32, 60, 48, 36 square feet. a. Figure the means and standard deviations for the governors and CEOs. |Governors | | Mean |43 | |Standard Deviation |6.831300511 | |CEOs | |Mean |44 | |Standard Deviation |12.64911064 | b. Explain, to a person who has never had a course in statistics, what you have done. The mean is an average number in a set of data points. In order to determine the mean, you must add up all points, and divide that number by the total numbers added. In this case, there were 4 data points, so after adding them together, you must then divide by the number 4. In finding the standard deviation, it is easiest to follow the formula: SD^2=∑(X-M)^2 N-1 In this equation, each variable indicated a particular value. SD^2= Variance X= Each Score M= Mean ∑= Sum of Squared Deviation Scores In order to solve the equation, you must have the mean, and sum

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