MEASURE OF DISPERSION

Which of the following is not a measure of dispersion?

• range

• variance

• standard deviation

• mode

Which of the measures of location is used in computing for the variance of a distribution?

• mean

• median

• mode

• midrange

It is defined as the square root of the variance.

• coefficient of variation

• midrange

• standard deviation

• kurtosis

If the dispersion is small, then the values in the distribution is close to the median.

• true

• false

Which of the measures of dispersion only uses two values in the distribution?

• range

• standard deviation

• variance

• mean deviation

Which of the following is a characteristic of the range? Check all that apply.

• All values in the distribution are used in the calculation.

• It is influenced by extreme values.

• It is dependent on the mean.

• It is easy to compute and to understand.

Which of the following is a property of the standard deviation? Check all that apply.

• It can be negative.

• All the values in the distribution are used in computing for the standard deviation.

• It is in the same units as the original data

• It is the most widely reported measure of dispersion.

The table shows the distribution of sizes of branded trousers sold in a departmental store. Calculate the standard deviation of the distribution of data.

• 3.29

• 3.59

• 10.85

• 12.69

Calculate the standard deviation of the set of data.

• 137.64

• 130.25

• 11.73

• 11.41

The stem-and-leaf plot is for the sample height (in centimetre) for a rose plants herbs. Determine the first quartile for this set of data.

• 135 cm

• 171 cm

• 156 cm

• 188 cm