Exam (elaborations)
BESC 3010 Exam 2- Questions & Answers
- Course
- Institution
BESC 3010 Exam 2- Questions & Answers
[Show more]
Content preview
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.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller ExamRoom. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
80796 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now