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Published byGyles Walker Modified over 5 years ago

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Quiz 2 Measures of central tendency Measures of variability

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**a) arithmetic mean b) median c) mode d) midrange**

1. Which measure of central tendency divides a sample into two parts of equal size (i.e., n/2)? a) arithmetic mean b) median c) mode d) midrange

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**2.What is the coefficient of variation for a test with mean 25 and SD 10?**

b) 10% c) 25% d) 2.5%

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**3. Compute the z-score for a test score of 35 from a test that had a mean of 50 and SD of 10.**

b) 3.5 c) -3.5 d) -1.5

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**4. Given a z-score of 1.20 what was the test score on a test with mean of 40 and SD of 12?**

b) 52.0 c) 54.4 d) 25.6

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**5. In normally distributed data approximately ____% of scores lie within +/–1 SD of the mean?**

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**6. Which phrase best describes the following distribution?**

a) negatively skewed b) positively skewed c) normally distributed

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**7. What is the median of the following ordered list of numbers?**

23, 45, 66, 67, 68, 80, 102 a) 64.4 b) 66.5 c) 67.0 d) 67.5

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**8. Standard deviation is defined as the _________.**

a) square root of the variance b) square of the variance c) mean divided by the variance d) range divided by 2

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