Margin Error Confidence Interval
Quiz
•
Mathematics
•
11th Grade
•
Practice Problem
•
Hard
Anthony Clark
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20 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A 99% confidence interval for a population mean is (100, 200). What is the margin of error?
50
100
150
200
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
To decrease the margin of error in a confidence interval, you should:
Increase the confidence level
Decrease the sample size
Increase the sample size
Decrease the confidence level
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
If the margin of error in a confidence interval is 8 and the sample mean is 200, what is the lower bound of the confidence interval?
192
196
200
208
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A survey estimates that 45% of voters favor candidate A with a margin of error of 4%. What is the confidence interval for the proportion of voters who favor candidate A?
(0.41, 0.49)
(0.39, 0.51)
(0.43, 0.47)
(0.45, 0.49)
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The amount added and subtracted to the statistic.
Margin of error
Statistic
Population
Point estimator
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The National Honor Society at Central High School plans to sample a random group of 100 seniors from all high schools in the state to determine the average number of hours per week spent on homework. A 95 percent confidence interval for the mean number of hours spent on homework will then be constructed using the sample data. Before selecting the sample, the National Honor Society decides that it wants to decrease the margin of error. Which of the following is the best way to decrease the margin of error?
Increase the confidence level to 99%
Use the population standard deviation
Use the sample standard deviation
Decrease the sample size
Increase the sample size
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the margin of error of this sample?
.21
.344
.14
.342
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