Learning Materials
Features
Discover
Chapter 8: Q. 38 (page 496)
Teens" online profiles Describe a possible source of error that is not included in the margin of error for the confidence interval in Exercise 36
There are possible sources of errors.
Over 30 million students worldwide already upgrade their learning with 91影视!
All the tools & learning materials you need for study success - in one app.
Get started for free
AIDS and risk factors In the National AIDS
Behavioral Surveys sample of adult heterosexuals, had both received a blood transfusion and had a sexual partner from a group at high risk of A I D S. We want to estimate the proportion in the population who share these two risk factors.
Prayer in school A New York Times/CBS News Poll asked the question, 鈥淒o you favor an amendment to the Constitution that would permit organized prayer in public schools?鈥� Sixty-six percent of the sample answered 鈥淵es.鈥� The article describing the poll says that it 鈥渋s based on telephone interviews conducted from Sept. 13 to Sept. 18 with adults around the United States, excluding Alaska and Hawaii. . . . The telephone numbers were formed by random digits, thus permitting access to both listed and unlisted residential numbers.鈥� The article gives the margin of error for a confidence level as percentage points.
(a) Explain what the margin of error means to someone who knows little statistics.
(b) State and interpret the 95% confidence interval.
(c) Interpret the confidence level.
A quality control inspector will measure the salt content (in milligrams) in a random sample of bags of potato chips from an hour of production. which of the following would result in the smallest margin of error in estimating the mean salt content ?
(a) confidence; .
(b) confidence; .
(c) confidence; .
(d) confidence; .
(e) at any confidence level.
R8.4. We love football! A recent Gallup Poll conducted telephone interviews with a random sample of adults aged 18 and older. Data were obtained for people. Of these, said that football is their favorite sport to watch
on television.
(a) Define the parameter in this setting. Explain to someone who knows no statistics why we can鈥檛 just say that of all adults would say that football is their favorite sport to watch on television.
(b) Check conditions for constructing a confidence interval for .
(c) Construct a 95% confidence interval for p.
(d) Interpret the interval in context.
Rating dorm food Latoya wants to estimate what proportion of the seniors at her high school like the cafeteria food. She interviews an SRS of of the seniors living in the dormitory. She finds that think the cafeteria food is good.
What do you think about this solution?
We value your feedback to improve our textbook solutions.
Explanations 
Textbooks 
Flashcards 
91影视 AI 
Notes 
Study Plans 
Study Sets 
Find a degree 
Magazine