Statistics for the Behavioral Sciences
3rd Edition
ISBN: 9781506386256
Author: Gregory J. Privitera
Publisher: SAGE Publications, Inc
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Chapter 13, Problem 29PR
To determine
State the three rules for identifying when the within-subjects design is likely to be a powerful test than the between-subjects design.
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Iranian researchers studied factors affecting patients’ likelihood of wearing orthodontic appliances, noting that orthodontics is perhaps the area of health care with the highest need for patient cooperation (Behenam & Pooya, 2007). Among their analyses, they compared students in primary school, junior high school, and high school. The data that follow have almost exactly the same means as the researchers found in their study, but with far smaller samples. The score for each student is his or her daily hours of wearing the orthodontic appliance. Did age of students impact how long they wore the orthodontic appliance for? Use alpha of .05.
Primary school: 16, 13, 18 (M= 15.67, s= 2.52) Junior high school: 8, 13, 14, 12 (M= 11.75, s=2.63) High school: 20, 15, 16, 18 (M= 17.25, s= 2.22)
Corporate advertising tries to enhance the image of the corporation. A study compared two ads from two sources, the wall street journal and the national enquirer. Subjects were asked to pretend that their company was considering a major investment in performax, the fictious sportswear firm in the ads. Each subject was asked to respond to the question " How trustworthy was the source in the sportswear company ad for performax?" On a 7-point scale. Higher values indicated more trustworthiness. Here is a summary of the results.
AD SOURCE. N Standard deviation Sample mean
wall street journal. 66 1.50 4.77
National Enquirer 61 1.64 2.43
a) Compare the two sources of ads using a T test. Be sure to state your null and alternative hypotheses, the test statistic with degrees of freedom, the P value and your conclusion.
b) Give a 95% confidence interval…
Chapter 13 Solutions
Statistics for the Behavioral Sciences
Ch. 13.3 - Prob. 1.1LCCh. 13.3 - Prob. 1.2LCCh. 13.3 - Prob. 1.3LCCh. 13.3 - Prob. 1.4LCCh. 13.4 - Prob. 2.1LCCh. 13.4 - Prob. 2.2LCCh. 13.4 - Prob. 2.3LCCh. 13.4 - Prob. 2.4LCCh. 13.5 - Prob. 3.1LCCh. 13.5 - Prob. 3.2LC
Ch. 13.5 - Prob. 3.3LCCh. 13.7 - Prob. 4.1LCCh. 13.7 - Prob. 4.2LCCh. 13.8 - Prob. 5.1LCCh. 13.8 - Prob. 5.2LCCh. 13 - Prob. 1FPCh. 13 - Prob. 2FPCh. 13 - Prob. 3FPCh. 13 - Prob. 4FPCh. 13 - Prob. 5FPCh. 13 - Prob. 6FPCh. 13 - Prob. 7FPCh. 13 - Prob. 8FPCh. 13 - Prob. 9FPCh. 13 - Prob. 10FPCh. 13 - Prob. 11FPCh. 13 - Prob. 12FPCh. 13 - Prob. 13CAPCh. 13 - Prob. 14CAPCh. 13 - Prob. 15CAPCh. 13 - Prob. 16CAPCh. 13 - Prob. 17CAPCh. 13 - Prob. 18CAPCh. 13 - Prob. 19CAPCh. 13 - Prob. 20CAPCh. 13 - Prob. 21CAPCh. 13 - Prob. 22CAPCh. 13 - Prob. 23CAPCh. 13 - Prob. 24CAPCh. 13 - Prob. 25CAPCh. 13 - Prob. 26CAPCh. 13 - Prob. 27CAPCh. 13 - Prob. 28PRCh. 13 - Prob. 29PRCh. 13 - Prob. 30PRCh. 13 - Prob. 31PRCh. 13 - Prob. 32PR
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- Computer-mediated communication (CMC) is a form of interaction that heavily involves technology (e.g., instant messaging, email). A study was conducted to compare relational intimacy in people interacting via CMC to people meeting face-to-face (FTF). Participants were 48 undergraduate students, of which half were randomly assigned to the CMC group and half assigned to the FTF group. The variable of interest, relational intimacy score, was measured (on a 7-point scale) for each participant after each of three different meeting sessions. Summary statistics for the first meeting session are given here. The researchers hypothesized that, after the first meeting, the mean relational intimacy score for participants in the CMC group would be lower than the mean relational intimacy score for participants in the FTF group. Test the researchers’ hypothesis using α = .10. CMC FTF Number…arrow_forwardComputer-mediated communication (CMC) is a form of interaction that heavily involves technology (e.g., instant messaging, email). A study was conducted to compare relational intimacy in people interacting via CMC to people meeting face-to-face (FTF).Participants were 48 undergraduate students, of which half were randomly assigned to the CMC group and half assigned to the FTF group. The variable of interest, relational intimacy score, was measured (on a 7-point scale) for each participant after each of three different meeting sessions. Summary statistics for the first meeting session are given here. The researchers hypothesized that, after the first meeting, the mean relational intimacy score for participants in the CMC group would be lower than the mean relational intimacy score for participants in the FTF group. Test the researchers’ hypothesis using α = .10. CMC FTF…arrow_forwardAcne is a common skin disease that affects most adolescents and can continue into adulthood. A study compared the effectiveness of three acne treatments and a placebo, all in gel form, applied twice daily for 12 weeks. The study's 517 teenage volunteers were randomly assigned to one of the four treatments. Success was assessed as clear or almost clear skin at the end of the 12 week period. The results of the study can be seen in the table below. Using the appropriate statistical test, determine if there is significant evidence that the four treatments perform differently. If so, how do they compare.arrow_forward
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