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BESC 3010 Exam 2- Questions & Answers
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BESC 3010 Exam 2- Questions & Answers
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BESC 3010 Exam 2- Questions &Answers
When the range of confidence for a confidence interval becomes higher - from 80% to 99%, for
example - then the confidence interval will... Correct Ans-become wider
Imagine a sample with n = 64 and a mean of 121 that comes from a population with a standard
deviation of 16. Based on these data, what would be the 80% confidence interval for the
population mean? (Use z-scores of ±1.28 for the 80% confidence level.) Correct Ans-(118.44,
123.56)
What is the point estimate for the population mean if the population standard deviation is 10,
the sample size is 100, and the sample mean is 80? Correct Ans-80
For which measures is it possible to compute a confidence interval? Correct Ans-Any
population parameter
As the standard deviation for a distribution increases, then the corresponding confidence
interval will... Correct Ans-become wider.
As the mean for a sample becomes greater, the width of the corresponding confidence interval
will... Correct Ans-stay the same.
Imagine a sample with n = 49 and a mean of 183 that comes from a population with a standard
deviation of 21. Based on these data, what would be the 99.9% confidence interval for the
population mean? (Use z-scores of ±3.29 for the 99.9% confidence level.) Correct Ans-
(173.13, 192.87)
Imagine a sample with n = 400 and a mean of 68 that comes from a population with a standard
deviation of 20. Based on these data, what would be the 90% confidence interval for the
, population mean? (Use z-scores of ±1.64 for the 90% confidence level.) Correct Ans-(66.36,
69.64)
A confidence interval specifies a range of values for a parameter estimate, whereas a(n) _____
specifies just a single value for that parameter. Correct Ans-point estimate
Which is generally more precise (in the statistical sense): a point estimate or a confidence
interval? Correct Ans-A point estimate
Which is generally more accurate (in the statistical sense): a point estimate or a confidence
interval? Correct Ans-A confidence interval
A point estimate for the population mean is based on... Correct Ans-the sample mean.
"Estimation" refers to a class of... Correct Ans-inferential statistics.
How is the point estimate affected when the sample standard deviation increases? Correct
Ans-It does not change
Imagine that samples - Sample A with n = 20 and Sample B with n = 200 - are drawn from the
same population and confidence intervals are computed for the same variables, which sample
will likely have the more precise confidence interval? Correct Ans-Sample B
How is a confidence interval affected when the sample standard deviation decreases?
Correct Ans-It becomes narrower
When the range of confidence for a confidence interval becomes lower - from 90% to 80%, for
example - then the confidence interval will... Correct Ans-become narrower.
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