/*! 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 103. Foster care versus orphanages Do... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 4: Q 103. (page 269)

Foster care versus orphanages Do abandon children placed in foster homes do better than

similar children placed in an institution? The Bucharest Early Intervention Project found that

the answer is a clear 鈥淵es.鈥� The subjects were 136 young children abandoned at birth and living in

orphanages in Bucharest, Romania. Half of the children, chosen at random, were placed in foster

homes. The other half remained in the orphanages.55 (Foster care was not easily available in Romania at the time and so was paid for by the study.) What conclusion can we draw from this study? Explain.

Short Answer

Expert verified

No conclusions were drawn for the study.

Step by step solution

01

Given information

Number of young children, n=136
Half of the children were placed in foster families at random. The remaining half remained in orphanages.

02

Concept

Most statistical studies try to draw conclusions that go beyond the data itself. In order to make population inferences, participants in a study must be randomly picked from the greatest population. Cause and effect can be inferred from a well-designed experiment in which treatments are randomly assigned to experimental units.

03

Explanation

Foster care was not readily available in Romania at the time of the study, so foster care was paid for by the study, according to the question. However, it's probable that the researchers influenced the study because they gathered money for foster care and wanted the study to come out in favor of it. As a result, we can't trust the study's findings and, as a result, we can't draw any conclusions from it.

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

High-speed Internet Laying fiber-optic cable is expensive. Cable companies want to make sure that, if they extend their lines out to less dense suburban

or rural areas, there will be sufficient demand and the work will be cost-effective. They decide to conduct a survey to determine the proportion of households in a rural subdivision that would buy the service. They select a sample of 5 blocks in the subdivision and survey each family that lives on those blocks.

(a) What is the name for this kind of sampling method?

(b) Suppose there are 65 blocks in the subdivision. Use technology or Table D to select 5 blocks to be sampled. Explain your method clearly.

Growing in the shade Ability to grow in shade may help pines 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, lightly reduced to 25% of normal by shade cloth, or light reduced to5% of normal. At

the end of the study, they dried the young trees and weighed them.

Dead trees On the west side of Rocky Mountain National Park, many mature pine trees are dying due to infestation by pine beetles. Scientists would like to

use sampling to estimate the proportion of all pine trees in the area that have been infected.

(a) Explain why it wouldn鈥檛 be practical for scientists to obtain an SRS in this setting.

(b) A possible alternative would be to use every pine tree along the park鈥檚 main road as a sample. Why is this sampling method biased?

(c) Suppose that a more complicated random sampling plan is carried out, and that 35% of the pine trees in the sample are infested by the pine beetle. Can

scientists conclude that 35% of all the pine trees on the west side of the park are infested? Why or why not?

The manager of a sports arena wants to learn more about the financial status of the people who are attending an NBA basketball game. He would like to give a survey to a representative sample of the more than 20,000fans in attendance. Ticket prices for the game vary a great deal: seats near the court cost over \(100each, while seats in the top rows of the arena cost \)25each. The arena is divided into 30numbered sections, from 101to 130Each section has rows of seats labeled with letters from A (nearest the court) to ZZ (top row of the arena).

Explain why it might be difficult to give the survey to an SRS of 200 fans.

The Community Intervention Trial for Smoking Cessation asked whether a community-wide advertising campaign would reduce smoking. The researchers located 11pairs of communities, each pair similar in location, size, economic status, and so on. One community in each pair participated in the advertising campaign and the other did not. This is

(a) an observational study.

(b) a matched pairs experiment.

(c) a completely randomized experiment.

(d) a randomized block design, but not matched pairs.

(e) a stratified random sample.
See all solutions

Recommended explanations on Math Textbooks

Pure Maths

Read Explanation

Discrete Mathematics

Read Explanation

Geometry

Read Explanation

Theoretical and Mathematical Physics

Read Explanation

Calculus

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.