Confidence Intervals for Means Intro

Quiz
•
Mathematics
•
12th Grade
•
Hard
Anthony Clark
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of the following changes to a study would result in a narrower confidence interval?
increasing the confidence level, increasing the sample size
decreasing the confidence level, decreasing the sample size
increasing the confidence level, decreasing the sample size
decreasing the confidence level, increasing the sample size.
2.
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
3.
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
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A sample size of n = 64 is drawn from a population whose standard deviation is σ = 5.6.
Find the margin of error for a 99% confidence interval for µ.
1.799
1.798
1.803
5.
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 Standard Error.
75
10
105.2
1.155
6.
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
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of the following actions would produce a confidence interval with a smaller width assuming all other contingencies remained constant?
Using a higher confidence level
Using a lower confidence level
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