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Practice Problems Ch 2

# Practice Problems Ch 2 - Practice Problems Chapter Two 1...

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Practice Problems Chapter Two 1 Practice Problems Chapter Two Sabrina Armstrong PSY/315 February 6 th , 2012 Tiffany Cron

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Practice Problems Chapter Two 2 Practice Problems Ch. 2: 11, 12, 13, 16, & 21 11. for the following scores: 2, 2, 0, 5, 1, 4, 1, 3, 0, 0, 1, 4, 4, 0, 1, 4, 3, 4, 2, 1, 0 Find the: (a) Mean = 2 (b) Median = 2 (c) Sum of squared deviations = 56 (d) Variance = 2.8 (e) Standard deviation = 1.673 12. for the following scores: 1,112; 1,245; 1,361; 1,372; 1,472 Find the: 13. for the following scores: 3.0, 3.4, 2.6, 3.3, 3.5, 3.2 Find the: 16. A psychologist interested in political behavior measured the square footage of the desks in the official office of 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, and 36 square feet. (a) Figure the means and standard deviations for the governors and for the CEOs. (b) Explain, to a person who has never had a course in statistics, what you have done. (c) Note the ways in which the means and standard deviations differ, and speculate on the possible meaning of these differences, presuming that they are representative of U.S. governors and large corporations’ CEOs in general. Solution: a) Governors: Mean= 43 Standard Deviation = 6.83 CEO's: Mean= 44 Standard Deviation = 12.65 b) Measuring the mean is finding the average size of the desk, It gives you a good idea of the size of the desks, as long as the spread in sizes is small. The standard deviation measures the spread in the sizes. If its large compared to the average size, then the desks are all different sizes, but if its small, then they are all about the same size: the mean size.
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