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