
Unit 7B Confidence Intervals
Authored by Sarah Lozano
Mathematics
11th - 12th Grade
Used 4+ times

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15 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
When interpreting the confidence interval, make sure that you are describing the
statistic
parameter
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A __________ gives an interval of plausible values for the _____________.
confidence interval, statistic
point estimate, parameter
point estimate, statistic
confidence interval, parameter
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Complete the equation:
point estimate +/- _____
standard deviation
margin of error
critical value
confidence level
4.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
What is the format for interpreting a confidence interval?
The interval from ___ to ___ captures the true mean in context.
C% of samples of the same size taken from the same population will capture the parameter in question
There is convincing evidence that C% gives the interval (___, ___) capturing the parameter in question.
We are C% confident that the interval from ___ to ___ captures the [parameter in context].
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What can you do to reduce the margin of error?
increase the confidence level
decrease the confidence level
increase sample size
decrease sample size
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Are the conditions met?
A recent poll of 738 randomly selected customers of a major US cell-phone carrier found that 170 of them had walked into something or someone while talking on a cell phone.
Yes
No
There is not enough data to determine.
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which z-value is used for a 95% confidence interval?
1.65
1.96
2.58
2.33
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