Week 1 - Preactice Quiz

Week 1 - Preactice Quiz - A difference between calculating...

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A difference between calculating the sample mean and the population mean is A. Only in the symbols, we u B. We divide the sum of the observations by n - 1 instead of n. C. The observations are ranked and select the middle value for the population mean. D. There are no differences. The correct answer is a. (n-1) occurs in the sample standard deviation and answer c is describing the calculation of the median.
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2. Which of the following measures of location is affected most by extreme values? A. B. Mean C. Mode D. Geometric mean The correct answer is b. An extreme value changes the sum or total drastically and, hence, the mean. 3. Which level of measurement is required for the median? A. B. Ordinal C. Interval D. Ratio The correct answer is b. The data must be ranked or ordered to find the mean.
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4. Which level of measurement is required for the mode? A. B. Ordinal C. Interval D. Ratio The correct answer is a. You can find a mode for any level of data. 5. In a set of observations, which measure of central tendency reports the value that occurs most often? A. B. Median C. Mode D. Geometric mean The correct answer is c. That's the definition of the mode.
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6. The weighted mean is a special case of the A. B.
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Week 1 - Preactice Quiz - A difference between calculating...

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