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Exam 4: Describing Data: Displaying and Exploring Data

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Question 41

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A large oil company is studying the number of gallons of gasoline purchased per customer at self-service pumps.The mean number of gallons is 10.0 with a standard deviation of 3.0 gallons.The median is 10.75 gallons.What is the Pearson's coefficient of skewness?

A) -1.00
B) -0.75
C) +0.75
D) +1.00

E) None of the above
F) B) and C)

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Question 42

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A box plot shows

A) The mean and variance
B) The relative symmetry of a distribution for a set of data
C) The percentiles of a distribution
D) The deciles of a distribution

E) A) and B)
F) B) and C)

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Question 43

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In a positively skewed distribution,where is the 99^th percentile located? _______________

The Pearson's coefficient of skewness (Sk)measures the amount of skewness and may range from -3.0 to +3.0.It is computed by subtracting the median from the mean,multiplying the result by 3 and dividing by ________________.

In a box plot,outliers are shown in the first quartile.

A dot plot shows

What chart or graph is useful for illustrating frequencies? ____________________.

What unit of measurement is used to express the coefficient of skewness? _________

A box plot shows the relative symmetry of a distribution.

The percentile range is the distance between any two ____________.

A dot plot is useful for quickly graphing frequencies in a small data set.

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

A box plot shows a distribution's mean and mode.

The coefficient of skewness is useful for comparing distributions with different units.

If Pearson's coefficient of skewness is negative,then the distribution is skewed to the right.

A box plot of sales versus production may be constructed by plotting the data on a graph labeled with sales on the Y-axis and production on the X-axis.

A quartile can be a decile,but a decile cannot be a percentile.

A scatter diagram of sales versus production may be constructed by plotting the data on a graph labeled with sales on the Y-axis and production on the X-axis.

What does the interquartile range describe?

What statistic can be used to measure the relative symmetry of a distribution? ___________________________________