AnswersMathematics for College Liberal Arts Sem 1 1207350 BCPS 2025-26Boxplots and Outliers

Weighted Averages Answers

4 verified answers
1
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A prior study determined the point estimate of the population proportion as 58% ( = 0.58). The analysts decide to conduct a second study on the same topic and would like its margin of error, E, to be 4% when its confidence level is 95% (z*-score of 1.96).

Question illustration
A
12
B
23
C
585
D
808
2
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Sameer polled a random selection of 120 of the 250 workers at his office to determine whether they were satisfied with their office supply ordering process. The survey showed that 90 of the workers polled were satisfied.

A
7%
B
10%
C
12%
D
18%
3

Zarina wants to determine a confidence interval based on a random poll she conducted about the percent of attendees at a conference who are vegetarian. She determined the margin of error for her poll results using the equation below.E = 1.96

Question illustration
A
With 90% confidence, between 4% and 30% of the attendees are vegetarian.
B
With 90% confidence, between 26% and 34% of the attendees are vegetarian.
C
With 95% confidence, between 4% and 30% of the attendees are vegetarian.
D
With 95% confidence, between 26% and 34% of the attendees are vegetarian.
4

The most recent poll of 50 randomly-selected members of a school club with a total of 80 members showed that 38 are planning to vote for Talia as president of the club. Talia correctly determined that the margin of error, E, of the poll using a 95% confidence interval (z*-score 1.96) is approximately 12%.

A
between 26% and 50%
B
between 38% and 62%
C
between 51% and 75%
D
between 64% and 88%
5

The latest poll of 400 randomly selected residents showed that 288 of them are hoping that the old town cinema stays open on Main Street.

A
4%
B
5%
C
7%
D
8%
6

Yolanda conducted a poll and out of the 270 people she surveyed, 60% were planning to live in their town for the rest of their lives. She decided to conduct another poll asking the same question, and again found that 60% of the people in the second poll were planning to live in their town for the rest of their lives.

A
30 people
B
90 people
C
810 people
D
2,430 people
7

A recent poll of 85 randomly selected cable subscribers found that 39% would be willing to pay extra for a new nature channel.

A
between 10% and 39%
B
between 29% and 49%
C
between 31% and 47%
D
between 38% and 40%
8

With a desired confidence of 90%, which has a z*-score of 1.645, which statements are true? Check all that apply.E = z*

Question illustration
A
The sample size is 93.
B
The sample size is 310.
C
The point estimate of the population proportion is 0.4.
D
The point estimate of the population proportion is 0.75.
E
The margin of error is approximately 4%.
F
The margin of error is approximately 6%.
9

The yearbook committee polled 80 randomly selected students from a class of 320 ninth graders to see if they would be willing to pay more for a yearbook if their names were printed on the front. Of the students who were surveyed, 26 of them said they would be willing to pay extra.

A
4%
B
6%
C
8%
D
9%
10

With a desired confidence of 99%, which has a z*-score of 2.58, which statements are true? Check all that apply.E = z*

Question illustration
A
The sample size is 40.
B
The sample size is 64.
C
The point estimate of the population proportion is 0.16.
D
The point estimate of the population proportion is 0.625.
E
The margin of error is approximately 12%.
F
The margin of error is approximately 16%.

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