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HOMEWORK. 1. Height has an approximately bell-shaped
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1. Height has an approximately bell-shaped distribution. For a sample of heights of college students
collected, the males had x =69 s =3 and the females had x = 66
a) Use the empirical rule to describe the distribution of heights for females.
Approximate 68% of the observations fall within the interger (__, __) ?
2. Here is the five-number summary for the distribution of a cigarette tax (in cents) for all the states in a
certain country. Use this information to answer parts a through d.
Minimum=6, Q1=35, Median=50, Q3=96, Maximum=160
a) About what proportion of the states have cigarette taxes (i) greater than 35 cents and (ii) greater
than 96 cents?
About __% of the states have cigarette taxes greater than 35 cents.
About __% of the states have cigarette taxes greater than 96 cents.
3. The scores on an exam have mean =85, standard deviation =11, minimum 61, Q1=72, median =75,
Q3=94, and maximum =107. State which of these values are used in a box plot and then sketch the box
Select all that apply:
4. A survey was conducted to determine how many miles per day employees of a company used public
transportation. The sample values are below.
0 0 7 0 0 0 11 0 9 0
a) Identify the five-number summary, and draw a box plot.
__, __, __, __, __
(type integers or decimals. Using ascending order. Do not round)
5. For a sample of 238 female heights, the mean was 64.1 inches and the standard deviation was 2.3
inches. The shortest person in this sample had a height of 55 inches.
a. Find the Z-score for the height of 55 inches. (round to one decimal as needed)
b. What does the negative sign for the z-score represent?
c. Is this observation a potential outlier according to the three standard deviation criterion? Explain.
6. The six full-time employees of a tanning salon near campus had annual incomes last year $8200,
$8400, $8400, $8500, $8700, $8900. The owner made $490,00.
a. For the seven annual incomes at the salon, report the mean and the median.
b. why is it misleading for the owner to boast to her friends that the average salary at the salon
is more than $70,000?
7. Explain what is wrong with the following pie chart, which depicts the federal government breakdown
by category for 2010.
Choose the correct answer below.
The pie chart only shows the bottom portion for two of the slices, which alone makes those two slices
In general, the sizes of the slices at the front of the pie are smaller than they should be, and the sizes of
the slices at the back of the pie are larger than they should be.
The colors of the pie chart are too similar, which makes the different slices difficult to distinguish.
In general, the sizes of the slices at the front of the pie are larger than they should be, and the sizes of the
slices at the back of the pie are smaller than they should be.
8. What information can a time plot show that a histogram cannot
A time plot identifies the mean, median, and mode.
A time plot shows the shape of the distribution.
A time plot connects the data points over time to show time trends.
A time plot shows the viewer the number of observations at each level.
This question was answered on: Feb 21, 2020
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