# Chapter 7 Statistics

```Chapter 7 Statistics
Type of Display
Bar Graph
Box Plot
Circle graph
Double Bar Graph
Histogram
Line Graph
Line plot
Best Used to…
Show the number of items in specific categories
Show measures of variation for a set of data’ also useful
for very large sets of data
Compare parts of the data to the whole
Compare two sets of categorical data
Show frequency of data divided into equal intervals
Show change over a period of time
Show frequency of data with a number line
Vocabulary
Use the following list of vocabulary and lesson references to study and prepare. (You can even use
www.studystack.com to create your own virtual flashcards using these vocabulary words and
definitions).
biased sample: A sample in which one or more parts of the population are favored over others.
convenience sample: A sample which includes members of the population that are easily
accessed.
box plot (box and whisker): A diagram that divides a set of data into four parts using the median
and quartiles.
population: A large group of data from which a sample of statistical data is selected.
sample Some portion of a larger group selected to represent that group.
random sample A sample that is chosen without any preference, representative of the entire
population.
statistics The study of collecting, organizing, and interpreting data.
survey A question or set of questions designed to collect data about a specific group of people.
systematic random sample A sample in which the items in the sample are selected according to
a specified time or item interval.
unbiased sample A sample that is selected so that it is representative of the entire population.
voluntary response sample A sample that involves only those who want to participate.
Chapter 7 CRCT Practice Questions
1. Which statistic gives the most accurate information for the following set of test scores?
2, 85, 87, 88, 89
range
A.
mode
B.
mean
C.
median
D.
Hint
2. A realtor is examining data on average home prices in four separate neighborhoods for
the past year. Which graph gives the most accurate representation of the home prices in
a neighborhood?
A.
B.
C.
D.
Hint
3. Meng conducted a survey to determine the favorite flavor of ice cream in his hometown.
Fifteen of the fifty people he surveyed liked strawberry best. How many of the 3,500
residents in the town would you expect to like strawberry best?
750
A.
560
B.
1,050
C.
150
D.
Hint
4. The manager of a computer store analyzed software sales by category for the past
month. The results are shown below. If the manager plans to order 150 software
packages for the upcoming month, how many of them should be home productivity?
36
A.
26
B.
32
C.
38
D.
Hint
5. Ben asked some of his neighbors about their main type of exercise. Of those asked 21%
said they walk or jog to keep fit. If 65,000 people live in Ben's city, how many people
could be expected to walk or jog for exercise?
21,000
A.
51,350
B.
35,480
C.
Hint
13,650
D.
6. The eighth grade class of 225 students is planning an ice cream social. If the director of
the ice cream social knows that 7 out of 10 students prefer vanilla, how many students
should be expected to eat vanilla ice cream?
A.
B.
C.
D.
Hint
7. To determine what people think about the construction of a new school, the school
board asks citizens to call a certain number and express their opinions. Describe the
sample used by the school board.
The sample is biased because it is a convenience sample.
A.
The sample is biased because it is a voluntary response sample.
B.
The sample is unbiased because it is a simple random sample.
C.
The sample is unbiased because it is a systematic random sample.
D.
Hint
8. Which is an appropriate display to show all of the individual finishing times for 20
runners in a race?
circle graph
A.
Venn diagram
B.
bar graph
C.
stem-and-leaf plot
D.
Hint
9. Which is an appropriate display to show how much the temperature changes throughout
the day?
A.
B.
C.
D.
Hint
10 Use this bar graph, which shows how some students traveled to school on 3 days.
.
Which day had the greatest number of bike riders?
All three days
A.
Friday
B.
Monday
C.
Wednesday
D.
Hint
11 The box-and-whisker plots show the test scores of two different classes. Which class had
. a greater range of test scores?
2nd period
A.
1st period
B.
There is no range.
C.
the ranges are the same
D.
Hint
12 Every Friday, the French Club sells bagels and the Spanish Club sells doughnuts to raise
. money for charity. The double dot plot shows how many items the clubs sell over several
weeks. Which club typically sells more items?
Both clubs sell the same number of
A. items.
No inference can be made from the
C. graph.
French Club
B.
Spanish Club
D.
```