Sections 8.1-8.2 Review
Quiz
•
Mathematics
•
9th - 12th Grade
•
Practice Problem
•
Easy
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Joseph Martin
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9 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The interval (223.45, 278.05) was found to be a 95% confidence interval for the mean braking distance of 2023 Toyota Tacoma's. Find the margin of error of this interval.
54.6
27.3
250.75
1.96
Tags
CCSS.HSS.IC.B.4
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following changes to a study will result in a narrower confidence interval?
Decreasing the sample size
Increasing the standard deviation
Decreasing the confidence level
Increasing the confidence level
Tags
CCSS.HSS.IC.B.4
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following values below represents the critical value z* for a 99.8% confidence interval?
3.091
0.001
2.576
0.998
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The Graduate Schools of Business and Law and Human sciences want to study the 8,000 recent PhD graduates. The researches take a random sample of 135 recent PhD graduates and found that 9% of PHD graduates are unemployed. Are the 3 conditions met to form a 95% confidence interval?
No, the random sample condition was not met.
Yes, all 3 conditions are met.
No, the 10% condition was not met.
No because np and n(1-p) are not both greater than 10.
Tags
CCSS.HSS.IC.B.4
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The Graduate Schools of Business and Law and Human sciences want to study the 8,000 recent PhD graduates. The researches take a random sample of recent PhD graduates (n = 135) and found that 9% of PHD graduates are unemployed. Which option shows how we would calculate a 95% confidence interval for the proportion of grads who are unemployed?
Tags
CCSS.HSS.IC.B.4
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The Graduate Schools of Business and Law and Human sciences want to study the 8,000 recent PhD graduates. The researches take a random sample of recent PhD graduates (n = 135) and found that 9% of PhD graduates are unemployed. Determine a 95% confidence interval for the proportion of recent PhD graduates who are unemployed.
(0.042, 0.138)
(0.049, 0.131)
(0.027, 0.153)
Tags
CCSS.HSS.IC.B.4
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The Graduate Schools of Business and Law and Human sciences want to study the 8,000 recent PhD graduates. The researches take a random sample of recent PhD graduates (n = 135) and found that 9% of PhD graduates are unemployed. The researchers found that a 95% confidence interval for the proportion of unemployed PhD graduates was (0.042, 0.138). Interpret this interval.
There is a 95% probability that the interval from 0.042 to 0.138 captures the true proportion of all recent PhD graduates who are unemployed.
If many random samples of recent PhD graduates are taken, about 95% of the created confidence intervals will capture the true population proportion
We are 95% confident that the interval from 0.042 to 0.138 captures the proportion of recent PhD graduates who are unemployed.
We are 95% confident that the interval from 0.042 to 0.138 captures the true proportion of all recent PhD graduates who are unemployed.
Tags
CCSS.HSS.IC.B.4
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