11. Given the following frequency distribution, SUICIDES BY METHOD, 1992 (in hundreds)

METHOD MALES FEMALES

Firearms 163 24

Poison 32 22

Hanging 37 9

Other 15 6

Total 247 61

SOURCE: Statistical Abstracts of the U.S., 1995.

Comparison of these two distributions would be facilitated by

a. Converting frequencies to relative frequencies

b. Expressing the frequencies more exactly

c. Expanding the Other category

d. Ignoring the Other category.

12. In the following well-constructed frequency distribution

X f

135149.99 1

120134.99 0

105119.99 1

90104.99 1

7589.99 2

6074.99 5

Total 10

The cumulative frequency for the interval 105119.99 equals

a. 1

b. 9

c. 10

d. None of the above

13. Automobile speeds are clocked along a remote stretch of interstate 80. If, in fact, motorists are obeying the posted 70 miles per hour speed limit, the frequency distribution of clocked speeds probably will be

a. Bimodal

b. Normal

c. Positively skewed

d. Negatively skewed

14. One inevitable byproduct of grouping data is the loss of

a. The identities of individual observations

b. Some data

c. Some regularities or patterns in the data

d. All of the above

15. Relative frequency distributions allow us to focus on

a. The part or fraction of the total frequency that occupies each class

b. The relative density of observations among difference classes or categories within the same distribution

c. The shapes of two or more distributions based on different total numbers of observations

d. All of the above

16. The assignment of exact percentile ranks requires

a. Excessive computations

b. Ungrouped data

c. Accurate computations

d. A large total number of observations

17. Cumulative frequencies indicate

a. How many observations fall at or below a particular class

b. How many observations fall at or above a particular class

c. Either a or b depending on your perspective

d. Neither a nor b

18. For the following frequency distribution

X f

8089 4

7079 2

6069 11

5059 3

Total 20

The interval 7079 has an approximate percentile rank of

a. 20

b. 30

c. 80

d. None of the above

19. In a frequency distribution for ungrouped data,

a. Class intervals are of size one

b. Observations are over-summarized

c. Duplicate observations can't occur

d. The range of possible observations should be very large

20. What's wrong with the following frequency distribution?

X f

220239 1

200219 0

160199 0

140159 11

120139 17

100119 21

7099 14

6069 8

3059 7

2029 2

019 1

Total 82

a. Gaps between classes

b. Unequal classes

c. Not exactly ten classes

d. Nothing is wrong

Bonus Question:

Make a Grouped Frequency Distribution, including, Class, Frequency, Relative Frequency, Cumulative Frequency, Cumulative Percent

A Bar Graph

A Stem and Leaf Display

Find the Mode, Median, Mean, Range and Interquartile Range

21, 22, 40, 30, 48, 0, 23, 3, 41, 34, 25, 23, 34, 43, 52, 27, 4, 50, 49, 23, 19, 7, 10 (total of 23 numbers)