Confidence Intervals
Quiz
•
Mathematics
•
12th Grade
•
Practice Problem
•
Hard
Anthony Clark
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11 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of the following is the definition of a "point estimate?"
The midpoint of the confidence interval
The sample size
The population
The standard deviation
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the point estimator for the interval (5 , 13)?
9
10
11
8
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
An IQ test was given to a simple random sample of 75 students at a certain college. The sample mean score was 105.2. Scores on this test are known to have a standard deviation of 10. It is desired to construct a 90% confidence interval for the mean IQ scores of the students at the college. Find the point estimate.
10
105.2
.90
75
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
An IQ test was given to a simple random sample of 75 students at a certain college. The sample mean score was 105.2. Scores on this test are known to have a standard deviation of 10. It is desired to construct a 90% confidence interval for the mean IQ scores of the students at the college. Find the Critical Value for the mean.
1.67
1.28
-1.67
-1.28
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
In a survey of 104 students, it was found that 79 went to the homecoming game this year.
Calculate a 99% confidence interval for p.
(.59, .79)
(.62, .85)
(.60, .90)
(.65, .87)
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the point estimate, p̂, of this sample?
.322
.342
.465
.511
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the margin of error of this sample?
.21
.344
.14
.342
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