Proportion Confidence Intervals
Authored by Barbara White
Mathematics
9th - 12th Grade
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Identify the confidence interval used in the figure below if each shaded area is equal to 0.05.
90%
95%
98%
99%
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
To find a z-score, use InvNorm(1-c).
True
False
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The confidence level of an interval estimate of a parameter is the probability that the interval estimate will contain the parameter.
True
False
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The symbol for the sample proportion is __________.
Zc
p̂
E
q
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A research company wants to estimate the proportion of people who like oatmeal. They want the confidence level to be 95%. The company gets 325 people to sign up for the survey, but on the day that the survey is issued, only 250 people show up and take the survey. What happens to the confidence interval?
It gets larger
It gets smaller
It stays the same
Too little information given
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Find the value of zc for a 90% confidence interval.
-1.96
1.645
1.440
-1.598
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The __________ is the maximum likely difference between the point estimate of a parameter and the actual value of the parameter.
Point Estimate
Inference
Confidence Level
Maximum Error of Estimate
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