Confidence Intervals for Sample Means
Authored by Anthony Clark
Mathematics
12th Grade
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10 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which confidence would result in a wider interval (assuming nothing else changed), 91% or 97%?
97%, z* is larger for higher confidence intervals
97%, the standard error is larger for higher confidence intervals
91%, z* is larger for lower confidence intervals
91%, the standard error is smaller for lower confidence intervals
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Does the interval (3, 14) support the claim that the mean of a data set is 2.9
Yes
No
Not enough information.
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of the following is an example of an interval estimate?
point estimate
critical value
confidence interval
statistic
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A __________ gives an interval of plausible values for the _____________.
confidence interval, statistic
point estimate, parameter
point estimate, statistic
confidence interval, parameter
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Increasing the sample size __________ the confidence interval.
increases
decreases
does not affect
there is not enough evidence to determine the answer
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A sample of 20 cupcakes found the interval for calories to be (150, 350). Which is the correct interpretation of the 95% confidence interval?
We are 95% confident that the true mean calorie content can be found with a sample of 150 to 350 cupcakes.
We are 95% confident that the true mean calorie content in cupcakes is between 150 and 350 calories.
We are 95% confident that a sample of 20 cupcakes will find 250 calories per cupcake.
None of these are correct.
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A 90% confidence interval for the mean speed driven by cars on East Main St. is given by (21, 45). What was the sample mean of this study?
12
24
33
None of these.
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