
Confidence Intervals for Means
Authored by Salko Kolarevic
Mathematics
9th - 12th Grade
Used 15+ times

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17 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 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
5 mins • 1 pt
Thirty randomly selected students took the calculus final. If the sample mean was 92 and the standard deviation was 9.4, construct a 99 percent confidence interval for the mean score of all students from which the sample was gathered.
89.08 < μ < 94.92
87.27 < μ < 96.73
87.29 < μ < 96.71
87.77 < μ < 96.23
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which of the following does NOT have an affect on the width of a confidence interval?
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which of the following changes to a study would result in a narrower confidence interval?
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In a crash test of 15 troopers, collision repair costs are found to have a distribution that is approximately normal, with a mean of $1800 and a standard deviation of $950. Construct a 99% confidence interval for the repair cost for the population.
(1070, 2530)
(1273, 2326)
(1799, 1801)
(1776, 1823)
6.
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
I have no idea what you're asking of me
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A 90% confidence interval for the mean speed driven by cars on Due West Road is given by (21, 45). What was the sample mean of this study?
12
24
33
None of these.
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