/*! 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. 95 Football on TV聽A Gallup poll co... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 4: Q. 95 (page 280)

Football on TVA Gallup poll conducted telephone interviews with a random sample of 1000adults aged 18and older. Of these, 37%said that football was their favorite sport to watch on television. The margin of error for this estimate is 3.1percentage points.

a. Would you be surprised if a census revealed that 50%of adults in the population would say their favorite sport to watch on TV is football? Explain your answer.

b. Explain how Gallup could decrease the margin of error

Short Answer

Expert verified

A.Yes, I would be surprised if a census revealed that 50%of the population would say their favorite sport to watch on TV is football.

b.Gallup could decrease the margin of error by increasing the sample size.

Step by step solution

01

Part (a) Step 1: Given Information

We are given following information:

Total random samples (age 18and more) =1000

The total number of samples out of 1000whose favorite sport is football to watch on TV is 370.

The margin of error for this estimate is 3.1percentage points.

We need to explain will we be surprised if a census revealed that 50%of the adult population would say their favorite sport to watch on TV is football.

02

Part (a) Step 2: Explanation

Yes, I would be surprised if a census revealed that 50%of the population would say their favorite sport to watch on TV is football. Because we expect the parameter to fall within the range of 33.1%to40.1%, a value of 50%seems unlikely and unusual.

03

Part (b) Step  1: Given Information

We need to explain decrease of margin of error due to Gallup.

04

Part (b) Step 2: Explanation

Gallup could decrease the margin of error by increasing the sample sizes.

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

Weight? Wait what? Marcos asked a random sample of 50mall shoppers for their weight. Twenty-five of the shoppers were asked directly and the other 25 were asked anonymously by means of a 鈥渟ecret ballot.鈥� The mean reported weight was13 pounds heavier for the anonymous group. Explain why the two means are so different.

SRS of engineers? A corporation employs 2000 male and 500 female engineers. A stratified random sample of 200 male and 50 female engineers gives every individual in the population the same chance to be chosen for the sample. Is it an SRS? Explain your answer.

Killing weeds A biologist would like to determine which of two brands of weed killer, X or Y, is less likely to harm the plants in a garden at the university. Before spraying near the plants, the biologist decides to conduct an experiment using24individual plants. Which of the following two plans for randomly assigning the treatments should the biologist use? Why?

Plan A: Choose the12healthiest-looking plants. Then flip a coin. If it lands heads, apply Brand X weed killer to these plants and Brand Y weed killer to the remaining12plants. If it lands tails, do the opposite.

Plan B: Choose12of the24plants at random. Apply Brand X weed killer to those12plants and Brand Y weed killer to the remaining12plants.

Boosting preemies Do blood-building drugs help brain development in babies born prematurely? Researchers randomly assigned 53babies, born more than a month premature and weighing less than 3pounds, to one of three groups. Babies either received injections of erythropoietin (EPO) three times a week, darbepoetin once a week for several weeks, or no treatment. Results? Babies who got the medicines scored much better by age 4on measures of intelligence, language, and memory than the babies who received no treatment.

a. Explain how this experiment used comparison.

b. Explain the purpose of randomly assigning the babies to the three treatments.

c. Name two variables that were controlled in this experiment and why it was beneficial to

control these variables.

d. Explain how this experiment used replication. What is the purpose of replication in this

context?

SRS of students? At a party, there are 30 students over age 21 and 20students underage21. You choose at random 3 of those over 21 and separately choose at random 2 of those under 21 to interview about their attitudes toward alcohol. You have given every student at the party the same chance to be interviewed. Is your sample an SRS? Explain your answer.
See all solutions

Recommended explanations on Math Textbooks

Logic and Functions

Read Explanation

Calculus

Read Explanation

Pure Maths

Read Explanation

Mechanics Maths

Read Explanation

Applied Mathematics

Read Explanation

Decision 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.