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HOMEWORK 3 40 POINTS Instructions: Answer each question by typing your answers and inserting SPSS output where indicated. Be sure you have reviewed the week’s SPSS video tutorial and completed ... the reading. Problem Set 1: An educational psychologist wants to determine how grades are affected by cooperation versus competition in classroom assignments. She randomly divides the class into two groups and gives them the same assignment. Group 1 (n = 10) is given instructions that encourage cooperating with fellow classmates to complete the assignment, and Group 2 (n = 9) is given instructions that encourage competing with fellow classmates to complete the assignment. She then collects and scores the assignments (total possible points = 100). Using the table below, set up a data file in SPSS. Remember to name your variables in “Variable View” as shown in the SPSS tutorial presentations. Assign Values to the “Instructions” variable as follows: 1 = cooperation; 2 = competition. 1. Create a table of Descriptive Statistics using the “Explore” function that shows descriptive statistics for cooperation and competition groups separately. Paste the table here: (5 pts) Descriptives Instructions Statistic Std. Error 2. Compare the means of each group. What can you say about the grades of the Cooperation group compared to the Competition group? (5 pts) 3. Using the same data, create a boxplot in SPSS to show the difference in grades between the two groups. Paste the boxplot here: (5 pts) 4. Based on the boxplot and descriptive statistics, which group shows more variability in grades? Support your answer with knowledge from the presentations and/or reading from this week. (5 pts) Problem Set 2: A cognitive psychologist wants to examine the difference in reaction times between people using cell phones while driving versus people not using cell phones. She places volunteers in a driving simulator. Half of the volunteers are instructed to use a cell phone to either text or talk, while the other half are instructed to drive normally with no cell phone use. She measures reaction times at a particular point in the driving task and records them in the table below. She assigns values to the “cell phone” variable as follows: 1 = yes (uses cell phone); 2 = no (doesn’t use cell phone). 1. Using the data in the table above, set up a data file in SPSS and create a table of descriptive statistics using the “Explore” command for each “cell phone” group separately. Paste the table here: (5 pts) Descriptives CellPhone Statistic Std. Error 2. Compare the means of the two groups. Which group took longer on average to react to the driving situation? (5 pts) 3. Using the same data, create a paneled histogram showing the distribution of reaction time in each sample. Paste the histogram here: (5 pts) 4. Compare the overall central tendency and variability of each group, using the descriptive table and graph. What do these measures indicate about the effect of using cell phones while driving? (5 pts) [Show More]

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