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Confidence Interval Standard Deviation and Variance
Authored by Barbara White
Mathematics
12th Grade
Used 3+ times

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19 questions
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1.
FILL IN THE BLANK QUESTION
1 min • 1 pt
2.
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1 min • 1 pt
3.
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1 min • 1 pt
4.
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1 min • 1 pt
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Confidence intervals allow us to....
Find a range for the sample mean using the population standard deviation.
Find the population mean to four decimal places.
Find a range for the population mean using a sample mean.
Find the probability that the population mean is the same as the sample mean.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When calculating Confidence Intervals, if we don't know the population standard deviation, we need to:
Make it up.
Estimate sigma with s, and use the z distribution.
Give up.
Estimate sigma with s, and use the t distribution.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When calculating Confidence Intervals, if we know the population standard deviation, but the population is NOT normally distributed, we...
Use z if the sample size is at least 30
Always use t.
Always use z.
Use z if the sample size is less than 30.
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