/*! 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 53. Improving response rate How can ... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 4: Q 53. (page 254)

Improving response rate How can we reduce the rate of refusals in telephone surveys? Most people who answer at all listen to the interviewer鈥檚 introductory remarks and then decide whether to continue. One study made telephone calls to randomly selected households to ask for opinions about the next election. In some calls, the interviewer gave her name, in others she identified the university she was representing, and in still others, she identified both herself and the university. For each type of call, the interviewer either did or did not offer to send a copy of the final survey results to the person interviewed. Do these differences in the introduction affect whether the interview is completed?

Short Answer

Expert verified

Subjects: Randomly chosen people.

Explanatory variables: interviewer information, if caller got survey results.

Treatments: No survey results were given by name and caller.

Response variable: Whether or not an interview was done.

Step by step solution

01

Given information

The experimental units, explanatory and response variables, and treatments must all be identified.

02

Concept

The treatments are randomly assigned to all of the experimental units in a completely randomized design.

In a double-blind experiment, neither the subjects nor the people who interact with them and assess the response variable are aware of the treatment they received.

Observational research looks at people and assesses factors of interest without trying to affect their responses.

Individuals are purposely subjected to a treatment in order to measure their responses in an experiment.

03

Explanation

People picked at random as subjects.

Explanatory variables include interviewer information and whether the caller received survey findings.

Treatments include six different combinations of caller information and survey data. These are the six treatment areas:

1) There were no survey results offered by name or caller.

2) The university's identification and caller data did not provide.

3) There were no survey results listed by name, university, or beneficiary.

4) To submit the survey details, include the name and sender.

5) Caller's name and university for survey observations

6) The caller volunteered to submit the survey results by providing his or her name, university, and phone number.

Whether or not an interview was conducted is a response variable.

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

In an interesting experiment, researchers examined the effect of ultrasound on birth weight. Pregnant women participating in the study were randomly assigned to one of two groups. The first group of women received an ultrasound; the second group did not. When the subjects鈥� babies were born, their birth weights were recorded. The women who received the ultrasounds had heavier babies.

Based on your answers to Questions 1 and 2, describe an improved design for this experiment

Learning biology with computers An educator wants to compare the effectiveness of computer software for teaching biology with that of a textbook presentation. She gives a biology pretest to each group of high school juniors, then randomly divides them into two groups. One group uses the computer, and the other studies the text. At the end of the year, she tests all the students again and compares the increase in biology test scores in the two groups.

(a) Is this an observational study or an experiment? Justify your answer.

(b) If the group using the computer has a much higher average increase in test scores than the group using the textbook, what conclusions if any, could the educator draw?

Look, Ma, no hands! Does talking on a hands-free cell phone distract drivers? Researchers recruit 40student subjects for an experiment to investigate this question. They have a driving simulator equipped with a hands-free phone for use in the study.

(a) Researchers are considering the design shown in the figure below. What type of design is this?

(b) Explain how blocking could be used to improve the design in (a).

(c) Why is it important to randomly assign the treatments within each block?

Does eating dinner with their families improve students鈥� academic performance? According to an ABC News article, 鈥淭eenagers who eat with their families at least five times a week are more likely to get better grades in

school.鈥�19 This finding was based on a sample survey conducted by

researchers at Columbia University.

What are the explanatory and response variables?

Stronger players A football coach hears that a new exercise program will increase upper-body strength better than lifting weights. He is eager to test this new program in the off-season with the players on his high school team. The coach decides to let his players choose which of the two treatments they will undergo

for three weeks鈥攅xercise or weight lifting. He will use the number of push-ups a player can do at the end of the experiment as the response variable.

(a) Which principle of experimental design does the coach鈥檚 plan violate? Explain how this violation could lead to confounding.

(b) Comment on the coach鈥檚 choice of response variable.
See all solutions

Recommended explanations on Math Textbooks

Probability and Statistics

Read Explanation

Mechanics Maths

Read Explanation

Logic and Functions

Read Explanation

Decision Maths

Read Explanation

Discrete Mathematics

Read Explanation

Pure 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.