Intro to Confidence Intervals

Quiz
•
Mathematics
•
12th Grade
•
Hard
Anthony Clark
FREE Resource
20 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A sample of 20 cupcakes found the interval for average calories to be (150, 350). Which is the correct interpretation of the 95% confidence interval?
We are 95% confident that the true mean caloric content can be found with a sample of 150 to 350 cupcakes.
We are 95% confident that the interval (150, 350) captures the true average caloric content.
We are 95% confident that a sample of 20 cupcakes will find 250 calories per cupcake.
None of these are correct.
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of the following changes to a study would result in a narrower confidence interval?
increasing the confidence level, increasing the sample size
decreasing the confidence level, decreasing the sample size
increasing the confidence level, decreasing the sample size
decreasing the confidence level, increasing the sample size.
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the margin of error for the interval (6.8, 12.9)?
9.85
3.05
3.50
6.8
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
If the 95% Confidence Interval for a population mean is (114.56, 125.54), then is it likely that the true population mean µ is greater than 130?
Yes
No
Not Enough Information
What?
5.
DRAG AND DROP QUESTION
1 min • 2 pts
A 95% confidence interval was conducted on American adults aged 45-64 and found that the between 15.7% and 19.4% had diabetes as of 2016.
a) What is the population proportion that has diabetes according to this confidence interval? (a)
b) What was the margin of error associated with this data? (b)
17.55%
1.85%
11.55
5.775
11.55%
5.775%
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Percentiles of the bootstrap distribution are provided. Use the percentiles to report a 95% confidence interval for the parameter.
6.593 hours to 7.78 hours
6.322 hours to 8.082 hours
6.438 hours to 7.947 hours
6.174 hours to 8.304 hours
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Identify the confidence interval used in the figure below if each shaded area is equal to 0.05.
90%
95%
98%
99%
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