Research Methods for the Behavioral Sciences (MindTap Course List)
6th Edition
ISBN: 9781337613316
Author: Frederick J Gravetter, Lori-Ann B. Forzano
Publisher: Cengage Learning
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Textbook Question
Chapter 6, Problem 5E
A researcher conducts a study with 6-year-old children at a summer computer camp for gifted children. However, the researcher suspects that different results would be obtained if the study were conducted with regular 6-year-old children. Does this study have a problem with internal validity or external validity?
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There is some evidence..... There appears to be some evidence suggesting that earlier retirement may lead to memory decline (Rohwedder & Willis, 2010). The researchers gave a memory test to men and women aged 60 to 64 years in several countries that have different retirement ages. For each country, the researchers recorded the average memory score and the percentage of individuals in the 60 to 64 age range who were retired. Note that a higher percentage retired indicates a younger retirement age for that country. The provided data are similar to the results from the study.
The following data are passed:
% Retired (X)
Memory score (Y)
39
9.3
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10.9
59
10.7
70
9.1
74
6.4
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9
According to a book published in 2011, 45% of the undergraduate students in the United States show almost no gain in learning in
their first two years of college (Richard Arum et al., Academically Adrift, University of Chicago Press, Chicago, 2011). A recent sample
of 1500 undergraduate students showed that this percentage is 36%. Can you reject the null hypothesis at a 10% significance level
in favor of the alternative that the percentage of undergraduate students in the United States who show almost no gain in learning
in their first two years of college is currently lower than 45%. Use both the p-value and the critical-value approaches.
Round your answers for the observed value of z and the critical value of z to two decimal places, and the p-value to four decimal
places.
Zobserved= i
p-value = i
Critical value = i
Hence we can conclude that the percentage of undergraduate students in the U.S. who show almost no gain in learning in their first
two years of college is currently
v…
The General Social Survey (GSS) found that 571 out of 670 (85%) Americansanswered the question on experimental design correctly. Do these data provideconvincing evidence that more than 80% of Americans have a good intuitionabout experimental design?
Chapter 6 Solutions
Research Methods for the Behavioral Sciences (MindTap Course List)
Ch. 6.1 - Describe, compare, and contrast the five research...Ch. 6.1 - Define research strategy, research design, and...Ch. 6.2 - Define the concept of external validity and a...Ch. 6.2 - Define the concept of internal validity and a...Ch. 6.3 - Identify and explain the common threats to...Ch. 6.4 - Describe how extraneous variables can become...Ch. 6.4 - Describe how environmental variables can be...Ch. 6.5 - Define experimenter bias, demand characteristics,...Ch. 6 - In addition to the key words, you should also be...Ch. 6 - For each of the following scenarios, identify...
Ch. 6 - How is the descriptive strategy different from the...Ch. 6 - Explain the difference among the terms research...Ch. 6 - A researcher conducts a study with 6-year-old...Ch. 6 - A researcher finds that college students are more...Ch. 6 - Explain how using college students as participants...Ch. 6 - What is the novelty effect, and how does it affect...Ch. 6 - Suppose that you wake up in the morning with all...Ch. 6 - What is the primary threat to internal validity...Ch. 6 - Describe how experimenter bias can be a threat to...Ch. 6 - Describe how participant reactivity can be a...Ch. 6 - Selection bias and individual differences are both...
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