/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Q. 94 Far from home? A researcher want... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 4: Q. 94 (page 280)

Far from home? A researcher wants to estimate the average distance that students at a large community college live from campus. To find out, she surveys a simple random sample of students from the registrar鈥檚 database.

a. Will the researcher鈥檚 sample result be exactly the same as the true population's mean? Explain your answer.

b. Which would be more likely to produce a sample result closer to the true population value: an SRS of 100students or an SRS of 50students? Explain your answer.

Short Answer

Expert verified

a.No, the researcher鈥檚 sample result will not be the same as the true population's mean.

b. An SRS of 100 students would be more likely to produce a sample result close to the true population value.

Step by step solution

01

Part (a) Step 1:Given Information

There are some random samples of students drawn by a researcher from the registrar鈥檚 database.

We need to explain will researcher's sample result will be exactly same as true population's mean.

02

Part (a) Step 2: Explanation

No, the researcher鈥檚 sample result will not be exactly the same as the true population's mean because different random samples will give us different statistics, and it is unlikely that these statistics will match the parameter exactly.

03

Part (b) Step 1: Given Information

We are given two random samples of students.

50students random samples

100students random samples

We need to explain which sample will give result closer to true population value

04

Part (b) Step 2: Explanation

An SRS of 100students would be more likely to produce a sample result close to the true population value because larger samples will reduce the variability and give accurate results.

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.

Over 30 million students worldwide already upgrade their learning with 91影视!

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

Weekend birthdays Over the years, the percentage of births that are planned cesarean

sections has been rising. Because doctors can schedule these deliveries, there might be

more children born during the week and fewer born on the weekend than if births were

uniformly distributed throughout the week. To investigate, Mrs. McDonald and her class

selected an SRS of 73people born since1993 . Of these people, 24were born on Friday,

Saturday, or Sunday. To determine if these data provide convincing evidence that fewer than43%37 of people born since 1993were born on Friday, Saturday, or Sunday, 100simulated SRSs were selected. Each dot in the graph shows the number of people that were born on Friday, Saturday, or Sunday in a simulated SRS of 73people, assuming that each person

had a 43%chance of being born on one of these three days.

a. Explain how the graph illustrates the concept of sampling variability.

b. Based on the data from the study and the results of the simulation, is there convincing

evidence that fewer than 43%of people born since 1993were born on Friday, Saturday,

or Sunday? Explain your answer.

In the experiment of the preceding exercise, the subjects were randomly assigned to the

different treatments. What is the most important reason for this random assignment?

a. Random assignment eliminates the effects of other variables such as stress and body

weight.

b. Random assignment is a good way to create groups of subjects that are roughly

equivalent at the beginning of the experiment.

c. Random assignment makes it possible to make a conclusion about all men.

d. Random assignment reduces the amount of variation in blood pressure.

e. Random assignment prevents the placebo effect from ruining the results of the study.

A gardener wants to try different combinations of fertilizer (none, 1cup, 2cups) and mulch (none, wood chips, pine needles, plastic) to determine which combination produces the highest yield for a variety of green beans. He has 60green-bean plants to use in the experiment. If he wants an equal number of plants to be assigned to each treatment, how many plants will be assigned to each treatment?

a. 1

b. 3

c. 4

d. 5

e.12

Growing in the shade- The ability to grow in shade may help pine trees found in the dry forests of Arizona to resist drought. How well do these pines grow in shade? Investigators planted pine seedlings in a greenhouse in either full light, light reduced to 25% of normal by shade cloth, or light reduced to 5% of normal. At the end of

the study, they dried the young trees and weighed them. Identify the experimental units and the treatments.

Sealing your teeth- Many children have their molars sealed to help prevent cavities. In an experiment, 120children aged6鈥�8were randomly assigned to a control group, a group in which sealant was applied and reapplied periodically for 36months, and a group in which fluoride varnish was applied and reapplied periodically for 42months. After 9years, the percent of initially healthy molars with cavities was calculated for each group. Identify the experimental units and the treatments.
See all solutions

Recommended explanations on Math Textbooks

Calculus

Read Explanation

Theoretical and Mathematical Physics

Read Explanation

Pure Maths

Read Explanation

Applied Mathematics

Read Explanation

Logic and Functions

Read Explanation

Discrete Mathematics

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.