Statistics Quiz

A numerical measure of linear association between two variables is the

• variance.

• covariance.

• standard deviation.

• coefficient of variation.

The closing stock price of MNM Corporation for the last 7 trading days is shown below.

• 24.

• 25.

• 26.

• 27.

Growth factors for the population of Atlanta in the past five years have been 1, 2, 3, 4, and 5. The geometric mean is

• 15.

• √15.

• √120.

• ⁵√120.

Which of the following symbols represents the mean of the population?

• σ²

• σ

• μ

• x̄

Which of the following is not a measure of variability of a single variable?

• Range

• Covariance

• Standard deviation

• Interquartile range

The variance of the sample

• cannot be negative.

• cannot be positive.

• cannot be zero.

• cannot be less than one.

Which difficulty of range as a measure of variability is overcome by interquartile range?

• The sum of the range variances is zero

• The range is difficult to compute

• The range is influenced too much by extreme values

• The range is negative

The descriptive measure of variability that is based on the concept of a variation about the mean is the

• range.

• interquartile range.

• absolute value of the range.

• standard deviation.

The most frequently occurring value of a data set is called the

• midrange.

• mode.

• mean.

• median.

The value of the sum of the deviations from the mean, i.e., \(\sum (x - \bar{x})\) must always be

• less than the zero.

• negative.

• either positive or negative depending on whether the mean is negative or positive.

• zero.