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Chapter 4: Q 3.1. (page 244)

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.

Did the experimental design take the placebo effect into account? Why is this important?

Short Answer

Expert verified

The concept did not recognize the placebo effect.

Step by step solution

01

Given information

Pregnant women participating in the study were randomly assigned to one of two groups

02

Concept

A placebo is an inactive treatment, sometimes called a 'sugar pill.

03

Explanation

The placebo effect was not included in the concept.

The placebo is a supportive therapy that has no "real" influence on the dependent variable, and the placebo effect is defined as a participant's favorable response to the placebo.

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Most popular questions from this chapter

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 20,000 fans in attendance. Ticket prices for the game vary a great deal: seats near the court cost over \(100 each, while seats in the top rows of the arena cost \)25 each. The arena is divided into 30 numbered sections, from 101 to 130 Each section has rows of seats labeled with letters from A (nearest the court) to ZZ (top row of the arena).

3 Which would be a better way to take a cluster sample of fans: using the lettered rows or the numbered sections as clusters? Explain.

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 20,000 fans in attendance. Ticket prices for the game vary a great deal: seats near the court cost over \(100 each, while seats in the top rows of the arena cost \)25 each. The arena is divided into 30 numbered sections, from 101 to 130 Each section has rows of seats labeled with letters from A (nearest the court) to ZZ (top row

of the arena).

Random digits In using Table D repeatedly to choose random samples, you should not always begin at the same place, such as line 101 Why not?

Students as customers A high school student the newspaper plans to survey local businesses about the importance of students as customers. From telephone book listings, the newspaper staff chooses 150 businesses

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Do reducing diets work? Dr. Linda Stern and her colleagues recruited 132obese adults at the Philadelphia Veterans Affairs Medical Center in Pennsylvania. Half of the participants were randomly assigned to a low-carbohydrate diet and the other half were assigned to a low-fat diet. Researchers measured each participant鈥檚 change in weight and cholesterol level after six months and again after one year. Subjects in the low-carb diet group lost significantly more weight than subjects in the low-fat diet group during the first six months of the study. At the end of a year, however, the average weight loss for subjects in the two groups was not significantly different.

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