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Inferences

Total questions: 37

Worksheet time: 3hrs 31mins

Name
Class
Date
1.
1.  Carlos wants to know the favorite sport of people at his school so he asks his baseball team.
a)
Biased
b)
Unbiased
2.
7. A public library asked every 10th person who entered to name the type of book they were getting
a)
Biased
b)
Unbiased
3.
3.  A hospital wants to open a gym. They ask the night-shift ER staff when they would use the gym.
a)
Biased
b)
Unbiased
4.
_______ is a part of a group being surveyed.
a)
Sample
b)
Population
c)
Random Sample
d)
Quartile
5.
Kim surveys 100 moviegoers that entered the movie theater in the first hour.  What type of sampling method is this?
a)
Random
b)
Convenience
c)
Biased
6.
Every member of the larger group has an equal chance of being chosen.
a)
secondary sample
b)
systematic sample
c)
stratified sample
d)
random sample
7.
You want to know what is the most favorite sport of 7th graders at BMS.  You ask 7th graders who want to participate to go to the office 5th period to complete a survey.  This is...
a)
Biased, because it is a convenience sample
b)
Unbiased
c)
Biased because it is an interval sample
d)
Biased because it is a volunteer sample
8.
Amy’s current grades for her assignments in math class are 85, 90, 95, and 80. What grade does she have to earn on her next assignment to attain an average of 90? 
a)
88
b)
90
c)
95
d)
100
9.
Betsy has scored a 94, 80, 89, 91 and 90 on her math tests. What must Betsy score on her next test to have a mean of exactly 90? 
a)
96
b)
91
c)
90
d)
89
10.
Blake’s test scores are 86, 70, 72, 100, 96, and 80. Which score must Blake earn on his next test to have a mean grade of exactly 85? 
a)
91
b)
88
c)
85
d)
84
11.
What is an outlier?
a)
A value that is much less or much greater than the other values in a data set.
b)
The difference between the upper and lower quartiles of a data set.
c)
The mean of the distances from each data value in a set to the mean of a set.
d)
The difference between the greatest and least numbers in a data set.
12.
Find the Mean. 
a)
5.8
b)
5
c)
5.6
d)
6
13.
What is the median of this set of data?
10, 90, 80, 60, 50, 40, 70, 30, 20, 100
a)
50
b)
60
c)
55
d)
45
14.
Ervin bowled 7 games last weekend. His scores are: 155, 165, 138, 172, 127, 193, 142. What is the range of Ervin's scores?
a)
193
b)
127
c)
60
d)
66
15.
Find the median of these numbers:
4, 2, 7, 5, 3, 5
a)
4
b)
5
c)
4.5
d)
6
16.

Professor Cooper teaches 24 students algebra. She makes box plots representing test scores on the first two tests as shown.

What is the difference in the interquartile range of Test 1 and the interquartile range of Test 2?

a)

2 points

b)

5 points

c)

7 points

d)

10 points

17.
a)

a

b)

b

c)

c

d)

d

18.

The table below shows the results of a survey of 200 people attending a hockey game.


The attendance for the hockey game is about 25,000 visitors each game. Based on the table, how many people out of 25,000 could be expected to buy a pennant?

a)

1375

b)

1650

c)

2750

d)

3850

19.
a)

a

b)

b

c)

c

d)

d

20.
a)

a

b)

b

c)

c

d)

d

21.
a)

0

b)

1

c)

3

d)

8

22.
a)

1

b)

2

c)

3

d)

4

23.

Find the maximum of the data set.

11 6 12 11 9 10 11 7

a)

11

b)

6

c)

12

d)

10

24.

Find the range of the data set.

11 6 12 11 9 10 11 7

a)

11

b)

6

c)

18

d)

9

25.

Find the median of the data set.

11 6 12 11 9 10 11 7

a)

11

b)

10.5

c)

9.625

d)

12

26.

Find the Lower Quartile (Q1) of the data set.

11 6 12 11 9 10 11 7

a)

11

b)

10.5

c)

9.625

d)

8

27.

Find the Upper Quartile (Q3) of the data set.

11 6 12 11 9 10 11 7

a)

11

b)

10.5

c)

9.625

d)

8

28.

Find the mode of the data set.

11 6 12 11 9 10 11 7

a)

11

b)

6

c)

12

d)

8

29.
What is the minimum value?
a)
64
b)
58
c)
66
d)
61
30.
What is the median?
a)
62
b)
58
c)
66
d)
60
31.
What value is the lower quartile (Q1)?
a)
66
b)
58
c)
60
d)
64
32.
What data value is the upper quartile (Q3)?
a)
64
b)
62
c)
66
d)
58
33.

Which box and whisker plot has the smaller median?

a)

Top plot

b)

Bottom plot

34.

Which city, Nashville or Dallas, has the largest maximum temperature?

a)

Nashville

b)

Dallas

35.
What percent of the data is between 25 and 30 on the number line?
a)
25%
b)
`50%
c)
75%
d)
100%
36.
11. What percentage of the data is between 90 and 140?
a)
25 %
b)
50%
c)
75%
d)
100%
37.
Roger bowled 7 games last weekend. His scores are: 155, 165, 138, 172, 127, 193, 142. What is Roger's median score?
a)
127
b)
155
c)
156
d)
193

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