Statistics for The Behavioral Sciences (MindTap Course List)
10th Edition
ISBN: 9781305504912
Author: Frederick J Gravetter, Larry B. Wallnau
Publisher: Cengage Learning
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Textbook Question
Chapter 18, Problem 21P
- In problem 13 in Chapter 17, we Discussed a study by Loftus and Palmer (1974) examining how different phrasing of questions can influence eyewitness testimony. In the study, students watched a video of an automobile accident and then were questioned about what they had seen. One group of participants was asked to estimate the speed of the cars when ''they smashed into each other.” Another group of was asked to estimate the speed of the cars when "the y hit each other.'' Suppose that the actual speed of the cars was 22 miles per hour.
- For the 50 people in the “smashed-into'' group, assume that 32 overestimated the actual speed
17 underestimated the speed, I was exactly right. ls this result significantly different from what would be expected by chance? Use a two tailed
test with a = .05.
In a classic study, Loftus and Palmer (1974) investigated the relationship between memory for eyewitnesses and the question they are asked.
In the study participants watched a film of an automobile accident and then were questioned about the accident. One group was asked how fast the cars were going when they “smashed into” each other.
A second group was asked about the speed when the car. “Hit” each other, and a third group was not asked any question about the speed of the cars. A week later, the participants returned to answer additional questions about the accident, including whether they recalled. Seeing any broken glass. Although there was no broken glass in the film, several students claimed to remember seeing it. The following table shows the frequency distribution of response for each group.
Response to the Question
Did You See Any Broken Glass?
Verb Used to Ask About the Speed
Verb Used as Ask About t, he Speed
Smashed into Hit
Control (Not Asked)
Response about Broken Glass
Yes: No
- Does the proportion of participants who claim to remember broken glass differ significantly from group to group? Test with a = .05.
- Compute Cramer’s V to n1easnfle the size of the treatment effect.
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Chapter 18 Solutions
Statistics for The Behavioral Sciences (MindTap Course List)
Ch. 18 - 1. Insurance companies charge young drivers more...Ch. 18 - 2. Güven, Elaimis, Binokay, and Tan (2003) studied...Ch. 18 - In problem 9 in Chapter 17, we described a study...Ch. 18 - 4. Problems 5 and 6 in Chapter 17 cited a study...Ch. 18 - 5. A researcher would like to determine whether...Ch. 18 - 6. A recent survey of practicing psychotherapists...Ch. 18 - 7. In 2005, Fung et al. published a study...Ch. 18 - 8. In problem 13 in Chapter 9, wepresented a study...Ch. 18 - Prob. 9PCh. 18 - Prob. 10P
Ch. 18 - Prob. 11PCh. 18 - 12. One of the original methods for testing ESP...Ch. 18 - Prob. 13PCh. 18 - Prob. 14PCh. 18 - 15. In Example 11.2 (p. 343) we presented a...Ch. 18 - Stressful or traumatic experiences can often...Ch. 18 - Prob. 17PCh. 18 - Prob. 18PCh. 18 - Prob. 19PCh. 18 - In Problem 14 in Chapter 11, we described a study...Ch. 18 - In problem 13 in Chapter 17, we Discussed a study...Ch. 18 - Prob. 22PCh. 18 - Prob. 23PCh. 18 - Prob. 24PCh. 18 - Prob. 25P
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