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BESC 3010 CH7- Questions & Answers
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BESC 3010 CH7- Questions & Answers
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BESC 3010 CH7- Questions & AnswersImagine 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 accurate confidence interval? Correct Ans-Sample B
How is a confidence interval affected when the sample standard deviation decreases?
Correct Ans-It becomes narrower
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