ch3 practice quiz

8/2/2019 Ch3 Practice Quiz

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Chapter Quiz(See related pages)

Results Reporter

Out of 14 questions, you answered 13 correctly with a final grade of 93%

13 correct (93%)

1 incorrect (7%)

0 unanswered (0%)

Your Results:

The correct answer for each question is indicated by a .

1 CORRECTA key difference between calculating the sample mean and

A)We use


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D)Ratio

4 CORRECT

In a set of observations, which measure of central tendenc A)Mean

B)MedianC)Mode

D)Standard deviation

5 CORRECTThe weighted mean is a special case of the

A)Arithmetic MeanB)MedianC)ModeD)Standard deviation

6 CORRECTIn comparing two different samples of 100 observations, oof 10 and a standard deviation of 50. The two samples are

A)Exactly the same.

B)Are centered at 10, but the first sample's data is m C)Are centered at 10, but the second sample's data is

D)Are positively skewed.

7 CORRECTFor a distribution, the mean is 5, the median is 15, and the

A)Positively skewedB)Negatively skewed

C)SymmetricD)Bell-shaped

8 CORRECTWhich measure of central tendency is the largest in a posit


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A)Mean

B)MedianC)ModeD)Variance

9 CORRECTWhich of the following statistics is a measure of dispersion

A)MeanB)MedianC)ModeD)Standard deviation

10

CORRECT A disadvantage of the range is

A)Only two values are used in its calculation.

B)It is in different units than the mean.

C)It does not exist for some data sets.D)All values are used in its calculation.

11CORRECT The numerator of the mean deviation is

A)The sum of squared deviations from the mean.B)The variance.

C)The sum of the absolute values of deviations from t

D)Always reported in units squared.

12

CORRECT The standard deviation isA)Based on squared deviations from the mean.B)Expressed in the same units as the mean.C)Uses all the observations in its calculation.D)All of the above.


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13

INCORRECT The variance is

A)Found by dividing N by the mean.

B)Expressed in the same units as the original data.

C)Found by squaring the standard deviation.

D)The square root of the standard deviation.

14CORRECT In a negatively skewed distribution

A)The mean, median, and mode are all equal.B)The mean is larger than the median.C)The median is larger than the mean.

D)The standard deviation must be larger than the me

ch3 practice quiz

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