Exam 3: Basic Statistics

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If nine scores have a mean of 11, what is the sum of the scores?

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The standard deviation is a measure of the spread of the middle 50% of the scores.

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When ordinal data are involved, the following measure(s) of central tendency can be used:

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The sum of deviations around the mean:

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Any change in any score of a group of data (N = 200) will change the value of the mean.

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Use the following data to answer this question: 10, 9, 7, 7, 6, 5, 4, 2, 1. What measure of central tendency would change most if the highest score were 25 instead of 10?

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Calculate the mean for the data listed below in the grouped frequency distribution. group mid 96-100 2 91-95 4 86-90 7 81-85 9 76-80 10 71-75 12 66-70 11 61-65 12 56-60 7 51-55 6 46-50 4 41-45 3

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17 2 16 4 15 5 14 7 13 7 12 8 11 10 10 9 9 5 8 3 -From the data in the problem above, complete a simple regression analysis to predict the score on a chin-ups (Y') test if the student completed 7 pull-ups (X) on that test. b = 1.04 a = .97 Y' = a + bX Y' = .97 + 1.04(7) Y' = .97 + 7.28

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High correlation coefficients never prove causation.

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Three groups of adult women engaged in a 12-week exercise program designed to help them lose weight. Group A participated in aerobic dance five times weekly, Group B did resistance weight training five times weekly, and Group C did aerobic dance three times weekly and resistance weight training twice a week. At the start and the end of the exercise program, the exercise leader weighed the participants and recorded their weights. To ascertain if there were statistically significant differences in

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If all scores in a distribution are equal, the standard deviation would be zero.

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Generally a T-score is derived from a z-score.

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Use the following data to answer this question: 10, 9, 7, 7, 6, 5, 4, 2, 1. What is the mode for this distribution?

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Multiple regression equations allow the user to predict multiple scores based on a single measurement.

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The percentage of scores falling between the mean and a +1 deviation unit on a normal distribution is approximately:

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Group cum 20-22 3 50 17-19 5 47 14-16 10 42 11-13 14 32 8-10 11 18 5-7 6 7 2-4 1 1 -What percentage of scores lies between the z-scores of −.15 and −.75?

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17 2 16 4 15 5 14 7 13 7 12 8 11 10 10 9 9 5 8 3 -Which of the following measures represents the highest degree of relative performance?

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Calculate the mean for the data listed below. 53, 52, 50, 49, 48, 47, 43, 41, 38, 37 _

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Group cum 20-22 3 50 17-19 5 47 14-16 10 42 11-13 14 32 8-10 11 18 5-7 6 7 2-4 1 1 -Given a set of data with a mean of 25.7 and standard deviation of 5.2, calculate the z-score of the following raw scores. a.\nobreakspace21.6 b.\nobreakspace28.9 c.\nobreakspace24.5 d.\nobreakspace31.4

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Which of these correlation coefficients indicates the smallest amount of shared variance?

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