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QNT 561 FINAL EXAM

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1) A difference between calculating the sample mean and the population mean is

A) Only in the symbols, we use instead of μ and n instead of N

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.

2) Which of the following measures of central location is affected most by extreme values?

A) Median

B) Mean

C) Mode

D) Geometric mean

3) Which level of measurement is required for the median?

A) Nominal

B) Ordinal

C) Interval

D) Ratio

4) Which level of measurement is required for the mode?

A) Nominal

B) Ordinal

C) Interval

D) Ratio

5) In a set of observations, which measure of central tendency reports the value that occurs most often?

A) Mean

B) Median

C) Mode

D) Geometric mean

6) The weighted mean is a special case of the

A) Mean

B) Median

C) Mode

D) Geometric mean

7) The relationship between the geometric mean and the arithmetic mean is

A) They will always be the same.

B) The geometric mean will always be larger.

C) The geometric mean will be equal to or less than the mean.

D) The mean will always be larger than the geometric mean.

8) Suppose you compare the mean of raw data and the mean of the same raw data grouped into a frequency distribution. These two means will be

A) Exactly equal.

B) The same as the median.

C) The same as the geometric mean.

D) Approximately equal.

9) In a set of 10 observations the mean is 20 and the median is 15. There are 2 values that are 6, and all other values are different. What is the mode?

A) 15

B) 20

C) 6

D) None of the above.

10) Which of the measures of central tendency is the largest in a positively skewed distribution?

A) Mean

B) Median

C) Mode

D) Cannot tell from the...

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