AnswersConcepts in Probability and Statistics - MA3120 B-CRTwo-Way Tables

Two-Way Tables Answers

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a =

Question illustration
Answer:

7

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b =

Answer:

31

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c =

Answer:

28

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d =

Answer:

13

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e =

Answer:

65

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A summer camp has 32 campers. A total of 22 of them swim, 20 play softball, and 5 do not swim or play softball. Which values complete the table?

A
a = 15, b = 10, c = 7, d = 5, e = 12
B
a = 15, b = 7, c = 5, d = 10, e = 12
C
a = 14, b = 7, c = 5, d = 12, e = 10
D
a = 14, b = 12, c = 7, d = 5, e = 10
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Which statement is true about the marginal frequencies in this table?

A
191 students play sports and 150 students do not.
B
153 students do not participate in sports and seventy-five 12th graders were surveyed
C
153 students do not participate in sports and 190 do.
D
191 students play sports and ninety-seven 10th graders were surveyed.
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Which statement is true about the joint frequencies in this table?

A
Twenty-three 9th graders and fifteen 11th graders prefer math.
B
Fourteen 11th graders prefer math and eight 10th graders prefer science.
C
Thirty-five 12th graders prefer math and nine 10th graders prefer science.
D
Twenty-three 9th graders and thirty-two 12th graders prefer math.
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What is the relative frequency for students who have been to Alaska?

Answers:
Selection 1:14/50
Selection 2:15/50
Selection 3:21/50
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✔ 15/5015/3621/5036/50

A
✔ 15/50
B
15/36
C
21/50
D
36/50
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6/506/21✔ 21/5021/36

A
6/50
B
6/21
C
✔ 21/50
D
21/36
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Residents of three counties were polled to find the percentage of residents who are Republican or Democrat.

Question illustration
Answers:
⇒ 10.1:10.1
Blank 2:16.5
Blank 3:58.9
Blank 4:41.1
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Question text not available

Answer:

16.5

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Question text not available

Answer:

58.9

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Question text not available

Answer:

41.1

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Which statements are correct? Check all that apply.

A
More 7th graders were surveyed than 8th graders.
B
The marginal relative frequency for action movies is 44%.
C
The joint relative frequency for 8th graders who like comedy movies is 16%.
D
Most students prefer drama movies.
E
Half of the 7th graders prefer action movies.
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Students from School A and School B were asked whether they watch TV or use the Internet after finishing their homework. The Venn diagram and the two-way table show the results from the two surveys. Which statement is true?

A
More students do both activities at A than at B.
B
More students watch TV at B than at A.
C
More students do neither activity at B than at A.
D
More students were surveyed at A than at B.

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