Learning Materials
Features
Discover
Chapter 8: Q. T8.2 (page 549)
The weights (in pounds) of three adult males are,and. What is the standard error of the mean for these data?
a.
b.
c.
d.
e.
The standard error of the mean is
Over 30 million students worldwide already upgrade their learning with Vaia!
All the tools & learning materials you need for study success - in one app.
Get started for free
You want to compute a confidence interval for the mean of a population with an unknown population standard deviation. The sample size is . What critical value should you use for this interval?
a.
b.
c.
d.
e.
Suppose we want a 90% confidence interval for the average amount spent on books by freshmen in their first year at a major university. The interval is to have a margin of error of \(2. Based on last year’s book sales, we estimate that the standard deviation of the amount spent will be close to \)30. The number of observations required is closest to
(a) 25. (b) 30. (c) 608. (d) 609. (e) 865.
Three branches According to a recent study by the Annenberg Foundation, only of adults in the United States could name all three branches of government. This was based on a survey given to a random sample ofU.S. adults.
a. Construct and interpret a confidence interval for the proportion of all U.S. adults who could name all three branches of government.
b. Does the interval from part (a) provide convincing evidence that less than half of all U.S. adults could name all three branches of government? Explain your answer.
Bottling cola A particular type of diet cola advertises that each can contains ounces of the beverage. Each hour, a supervisor selects cans at random, measures their contents, and computes a confidence interval for the true mean volume. For one particular hour, the confidence interval is ounces to ounces.
a. Does the confidence interval provide convincing evidence that the true mean volume is different than ounces? Explain your answer.
b. Does the confidence interval provide convincing evidence that the true mean volume is ounces? Explain your answer.
Most people can roll their tongues, but many can’t. The ability to roll the tongue is
genetically determined. Suppose we are interested in determining what proportion of students can roll their tongues. We test a simple random sample of students and find that can roll their tongues. The margin of error for a confidence interval for the true proportion of tongue rollers among students is closest to which of the following?
a.
b.
c.
d.
e.
What do you think about this solution?
We value your feedback to improve our textbook solutions.
Explanations 
Textbooks 
Exams 
GCSE 
IGCSE 
AS 
A Level 
International A Level 
University Admissions Tests 
Flashcards 
Vaia AI 
Notes 
Study Plans 
Study Sets 
Find a job 
Find a degree 
Student Deals 
Magazine 
Mobile App