Ex 4 practice problem answers f 23

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Northern Virginia Community College *

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210

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Psychology

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Dec 6, 2023

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PSY 210 Exam 4 study guide sp 23 1. A researcher believes that the amount of popcorn that movie-goers eat is affected by both the type of movie and whether they had eaten before the movie or not. State hypotheses and interpret the results given α = .05.

2. A graduate student in psychology believes that there is a relationship between consumption of alcoholic beverages and blood pressure. He measures the number of alcoholic beverages over one week and blood pressure for N= 8 men. The results are below. Use α = .05 2tail : a. State hypothesis for the correlation: b. Is the relationship significant? c. State the conclusion in APA format. Also evaluate the regression equation and state the conclusion in APA format, using α = .05. d. what is the regression equation? e. Using the regression equation, if a student has5 alcoholic drinks a week, what would you expect her blood pressure to be?

3. A social psychologist is interested in how long people will wait to respond to cries from help from and unknown and person and whether the age of the voice they hear makes any difference. A total of N= 20 participants sit in a room and hear one of 4 voices calling out for help. Compete the ANOVA table, state hypotheses and interpret results using α = .01, stating results in APA format. ANOVA DV_TimeToHelp Sum of Squares df Mean Square F Sig. Between Groups 56.950 .001 Within Groups 2.125 Total

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4. An IO psychologist is testing several types of keyboards for effectiveness. She has n=5 people in each of 3 groups use different types of keyboards to type a paragraph and then she records the number of errors they make. Given the SPSS results below, state the hypotheses and conclusions in APA format including post hoc tests if appropriate. α=.05 H 1 : Keyboard type affects errors (or effectiveness), µ1≠µ2≠µ3 H 0 : Keyboard type does not affect errors (or effectiveness), µ1=µ2=µ3 Analysis of variance suggests that the keyboard type affects errors/effectiveness, F(2,12) = 9.13, p = .004, η 2 =.60. Post hoc comparisons using Tukey’s SD indicates there were differences between the means of keyboard A (M=1, SD = 1.73) and Keyboard B (M=5.0, SD = 2.24) and Keyboard C (M = 6.0, SD = 2.88). There was no difference between keyboards B and C.

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