Statistical Techniques in Business and Economics - Chapter 4

The test scores for a class of 147 students are computed. What is the location of the test score associated with the third quartile?

111

The median of a sample will always equal the:

50th percentile.

Pearson's coefficient of skewness is a measure of a distribution's symmetry.

True

A dot plot is best applied when _____________________.

A single variable is summarized

Outliers are clearly presented in a _____________.

Box plot

A scatter diagram of sales versus production may be constructed by plotting the minimum, first quartile, median, third quartile, and maximum values of each variable.

False

The 50th percentile of a distribution is the same as the distribution mean.

False

The coefficient of skewness is the standard deviation divided by the mean.

False

In a distribution, the second quartile corresponds with the __________.

Median

If the coefficient of skewness is equal to zero, the shape of the distribution is __________.

Symmetric

Which of the following is not a measure of dispersion?

The 50th percentile

A dot plot can be used to show _________________.

The distribution for a quantitative variable

What statistics are needed to draw a box plot?

The minimum, maximum, median, first and third quartiles.

What does the interquartile range describe?

The range of the middle 50% of the observations

A dot plot is useful for showing individual observations.

True

A dot plot is useful for showing the range of the data.

True

A dot plot shows the symmetry of a distribution.

True

A relationship between two nominal variables is summarized by a contingency table.

True

A stem-and-leaf diagram shows the actual data values.

True

If a distribution is negatively skewed, the distribution is not symmetrical and the long tail is to the left.

True