Login Registrieren

Warning: foreach() argument must be of type array|object, bool given in /var/www/html/web/app/themes/studypress-core-theme/template-parts/header/mobile-offcanvas.php on line 20

The Practice of Statistics for AP

David Moore,Daren Starnes,Dan Yates

$Math Studyset Vaia Explanations$ Math

4th Edition · 809 pages

ISBN: 9781319113339

Chapter 10: Q. 26 (page 670)

A large university is considering the establishment of a schoolwide recycling program. To gauge interest in the program by means of a questionnaire, the university takes separate random samples of undergraduate students, graduate students, faculty, and staff. This is an example of what type of sampling design?
(a) Simple random sample
(b) Stratified random sample
(c) Convenience sample
(d) Cluster sample
(e) Systematic sample

Short Answer

Expert verified

This is an example of (b) Stratified random sample .

Step by step solution

01

Given information

We are given that a large university is considering the establishment of a schoolwide recycling program. The university takes separate random samples of undergraduate students, graduate students, faculty, and staff . We have to find that what type of sampling design, this example belongs to.

02

Simplify

As we know the overall population is divided into sub populations based on a variable called strata. that is undergraduate students, graduate students, faculty, and staff .

Therefore,this example will be Stratified Random Sample.

Unlock Step-by-Step Solutions & Ace Your Exams!

Full Textbook Solutions
Get detailed explanations and key concepts
Unlimited Al creation
Al flashcards, explanations, exams and more...
Ads-free access
To over 500 millions flashcards
Money-back guarantee
We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Are teens or adults more likely to go online daily? The Pew Internet and American Life Project asked a random sample of $800$ teens and a separate random sample of $2253$ adults how often they use the Internet. In these two surveys, $63 %$ of teens and $68 %$ of adults said that they go online every day. Construct and interpret a $90 %$ confidence interval for $p_{1} - p_{2}$ ?

National Park rangers keep data on the bears that inhabit their park. Below is a histogram of the weights of $143$ bears measured in a recent year.

Which statement below is correct?

(a) The median will lie in the interval ( $140, 180$ ), and the mean will lie in the interval ( $180, 220$ ).

(b) The median will lie in the interval ( $140, 180$ ), and the mean will lie in the interval ( $260, 300$ ).

(c) The median will lie in the interval ( $100, 140$ ), and the mean will lie in the interval ( $180, 220$ ).

(d) The mean will lie in the interval ( $140, 180$ ), and the median will lie in the interval ( $260, 300$ ).

(e) The mean will lie in the interval ( $100, 140$ ), and the median will lie in the interval ( $180, 200$ ).

Refer to Exercise $15$ .

(a) Carry out a significance test at the $α = 0.05$ level.

(b) Construct and interpret a $95 %$ confidence interval for the difference between the population proportions. Explain how the confidence interval is consistent with the results of the test in part (a).

T10.11. Researchers wondered whether maintaining a patient's body temperature close to normal by heating the patient during surgery would affect wound infection rates. Patients were assigned at random to two groups: the normothermic group (patients' core temperatures were maintained at near normal, $36.5 ° C$ , with heating blankets) and the hypothermic group (patients" core temperatures were allowed to decrease to about $34.5 ° C$ ). If keeping patients warm during surgery alters the chance of infection, patients in the two groups should have hospital stays of very different lengths. Here are summary statistics on hospital stay (in number of days) for the two groups:

$\begin{array}{lccc} Group & n & \bar{x} & s_{x} \\ Normothemic & 104 & 12.1 & 4.4 \\ Hypothermic & 96 & 14.7 & 6.5 \end{array}$

(a) Construct and interpret a $95 %$ confidence interval for the difference in the true mean length of hospital stay for normothermic and hypothermic patients.

(b) Does your interval in part (a) suggest that keeping patients warm during surgery affects the average length of patients' hospital staves? Justify your answer.

Down the toilet A company that makes hotel toilets claims that its new pressure-assisted toilet reduces the average amount of water used by more than $0.5$ a gallon per flush when compared to its current model. To test this claim, the company randomly selects $30$ toilets of each type and measures the amount of water that is used when each toilet is flushed once. For the current-model toilets, the mean amount of water used is $1.64$ a gal with a standard deviation of $0.29$ gal. For the new toilets, the mean amount of water used is $1.09 gal$ with a standard deviation of $0.18 gal$ .

(a) Carry out an appropriate significance test. What conclusion would you draw? (Note that the null hypothesis is not $H_{0} : μ_{1} - μ_{2} = 0_{-})$

(b) Based on your conclusion in part (a), could you have made a Type I error or a Type Il error? Justify your answer.

See all solutions

Recommended explanations on Math Textbooks

Calculus

Read Explanation

Logic and Functions

Read Explanation

Discrete Mathematics

Read Explanation

Applied Mathematics

Read Explanation

Geometry

Read Explanation

Mechanics Maths

Read Explanation

View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.

Sign-up for free