Research Methods for the Behavioral Sciences
5th Edition
ISBN: 9780357231913
Author: Frederick J Gravetter; Lori-Ann B. Forzano
Publisher: Cengage Limited
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Textbook Question
Chapter 11.3, Problem 5LO
Explain how a factorial study can combine different research designs (between and within subjects) and different research strategies (experimental and nonexperimental) and identify these features when they appear in a research report.
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3. Does stress affect the recall ability of police witnesses? This issue was studied in an experiment that tested
eyewitness memory a week after a nonstressful interrogation of a cooperative suspect and a stressful interrogation
[the way of questioning] of an uncooperative suspect. The numbers of details recalled a week after the incident are
summarized in the margin (based on data from "Eyewitness Memory of Police Trainees for Realistic Role Plays," by
Yuille et al., Journal of Applied Psychology, Vol. 79, No. 6). Use 0.01 level of significance to test the claim in the
article that stress decreased the amount recalled. Assume equal population variances.
Nonstress
Stress
n1 = 40
X1 = 53.3
S1 = 11.6
n2 = 40
X2 = 45.3
S2 = 13.2
a. Claim (in symbolic form):
Но:
На:
b. level of significance:
test-statistic:
tail of distribution:_
c. Decision Rule: Reject Ho if
d. Computation
e. Decision (Reject Ho or Failed to reject Ho)
f. Conclusion
W. Thomas Boyce, a professor and pediatrician at the University of British Columbia, Vancouver, has studied interactions between individual differences in physiology and differences in experience in determining health and well-being. Dr. Boyce found that some children are more sensitive to their environments. They do exceptionally well when the environment is supportive but are much more likely to have mental and physical health problems when the environment has challenges.
You decide to do a similar study, conducting a factorial experiment to test the effectiveness of one environmental factor and one physiological factor on a physical health outcome. As the environmental factor, you choose two levels of stressful life events. As the physiological factor, you choose three levels of immune reactivity. The outcome is number of respiratory illnesses in the previous 12 months, and the research participants are kindergartners.
Chapter 11 Solutions
Research Methods for the Behavioral Sciences
Ch. 11.1 - Define a factorial research design, including the...Ch. 11.2 - Define a main effect for one factor and an...Ch. 11.2 - Explain how the existence of an interaction can...Ch. 11.2 - Describe and explain the independent relationship...Ch. 11.3 - Explain how a factorial study can combine...Ch. 11.3 - Identify the statistical analyses that are...Ch. 11.4 - Describe three specific applications of the...Ch. 11 - In addition to the key words, you should also be...Ch. 11 - In a classic study, Shrauger (1972) examined the...Ch. 11 - Suppose a researcher conducts a two-factor study...
Ch. 11 - The following matrix represents the results (the...Ch. 11 - The following data show the pattern of results...Ch. 11 - Under what circumstances will the main effects in...Ch. 11 - Prob. 7ECh. 11 - In Figure 11.5, we show three combinations of main...Ch. 11 - For a two-factor research study with two levels...Ch. 11 - A researcher would like to use a factorial study...Ch. 11 - A two-factor analysis of variance is used to...Ch. 11 - Prob. 1EACh. 11 - In Figure 11.5, we show three combinations of main...
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- What is a unique advantage of the Latin Square design? It reduces the carryover effect while maximizing the strength of the IV manipulation. The Latin Square design uses multiple langauges. It counterbalances while reducing the number of groups/people needed to control for order effects. It is useful in an independent groups designs when matching participants on the dependent variable. Previous O O Oarrow_forwardYou're trying to find out how many students who graduate with accounting degrees from large universities are employed at graduation. You design an experiment where you collect information on several variables from recent graduates from the University of Florida accounting program. Specifically, you survey 198 alumni about their employment status, age at graduation, gender, and grade point average. What's the population, and what's the sample? The population is everyone at the University of Florida, and the sample is the 198 alumni who returned the survey. The population is the 198 alumni who returned the survey, and the sample is accounting alumni from large universities. The population is college students at large universities, and the sample is accounting students. The population is accounting program alumni at large universities, and the sample is the 198 alumni who returned the survey. Researchers are interested in increasing female participation in the technology…arrow_forwardA factorial experiment was designed to test for any significant differences in the time needed to perform English to foreign language translations with two computerized language translators. Because the type of language translated was also considered a significant factor, translations were made with both systems for three different languages: Spanish, French, and German. Use the following data for translation time in hours. Language Spanish French German System 1 10 15 10 14 19 System 2 6. 14 14 10 16 20 Test for any significant differences due to language translator system (Factor A), type of language (Factor B), and interaction. Use a = .05. Complete the following ANOVA table (to 2 decimals, if necessary). Round your p-value to 4 decimal places. Source of Variation Sum of Squares Degrees of Freedom Mean Square F p-value Factor A 1 Factor B 2 Interaction Error 52 6 8.6666 Total 11arrow_forward
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