EP635- HW4and HW5

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EP635- HW4and HW5

Written Assignment 3 (AR3 signature assignment)

Independent samples t test significance testing

Instructions

Download the file unit 3_SPSSHW3_data.sav. This data is related to participants’ perception on cross-racial adoption. Besides the demographic related questions and 10 questions/statements measuring participants’ attitudes, there is a composite score of attitude toward adoption, which is the focus of this assignment. Please refer to the textbook (Brace et. al., 2013, p. 91) for more information about the data.

The purpose of the analysis is to determine whether there is a statistically significant difference in cross-racial adoption score between males and females. You are expected to:

Grading Guidelines

  1. State the null and alternative hypotheses (2 points)
  2. State the independent variable and its levels (1 point)
  3. State the dependent variable and its measurement scale (1 point)
  4. Test the hypothesis (Hint: use a parametric test) (2 points)
  5. Report and interpret the results (please note that the report should follow APA format. Refer to chapter 5 of Brace et. al., 2013 on how to report the results). (7 points)
  6. Report the implications of the findings for how, if at all, educators should adapt their approach to parents when discussing issues about adopted children. (5 points)
  7. Save and submit the SPSS syntax and output files used to complete items 1-5 above. The file names should begin with your first and last name followed by the homework number (e.g., John Doe HW1.sav; John Doe HW1.sps; John Doe HW1.spv). (2 points)

Unit 4- HW- Comprehension Question:

Instructions

Respond to chapter 5 comprehension question 12 In Warner (2013, p. 217). Suppose that a student conducts a study in which the manipulated independent variable is the level of white noise (60 vs. 65 dB). Ten participants are assigned to each level of noise; these participants vary widely in age, hearing acuity, and study habits. The outcome variable is performance on a verbal learning task (how many words on a list of 25 words each participant remembers). The t value obtained is not statistically significant. What advice would you give to this student about ways to redesign this study that might improve the chances of detecting an effect of noise on verbal learning recall?

Unit 5- Comprehension Question- Instructions

Respond to chapter 22 question 5 Warner (2013, p. 1004)

Consider this study conducted by Kim Mooney (1990) at the University of New Hampshire. SBP was measured at six points in time using a Finapres noninvasive blood pressure monitor:

  • Time 1: When participants arrived at the laboratory and before they signed an informed consent form
  • Time 2: After participants read and signed an informed consent form that told them that they would be doing a stressful social role play (about being accused of shoplifting) that would be videotaped (they were told that they had 5 minutes to think about what they would say in this situation)
  • Time 3: After a 5-minute period (during which they prepared what to say)
  • Time 4: During the stressful social role play
  • Time 5: Ten minutes after the role play was completed
  • Time 6: Twenty minutes after the role play was completed

At each point in time, for each of 65 participants, SBP was measured; the variables sys1, sys2, …, sys6 correspond to the measurements of blood pressure made at the six points in time just described. (The blood pressure monitor used in this study looked at peripheral arterial pressure in the middle finger, and so the blood pressure readings tended to be systematically higher than the readings usually obtained by more conventional blood pressure measurement methods.)

  1. Before looking at the SPSS output for this study, answer these questions:
    1. What research questions can the researcher answer using these data? (2 point)
    2. What form would the formal null hypothesis take? (1 point)
  2. After looking at the SPSS output for this study (see Figure 22.21, pp. 1005-1006), answer these questions. Also, write up the results as they would appear in a journal article. (2 points)
    1. Is there any evidence that the sphericity assumption is violated? (2 point)
    2. Overall, was there a statistically significant difference in SBP across the six points in time? (1 point)
    3. At what time was SBP highest, and how great was the increase in SBP across time? (2 point)

Unit 5- Written Assignment- ANOVA

Instructions

Load the data file unit 5_SPSSHW4_data_ANOVA.sav. This file contains the data collected during a study of the effects of time on memory for details of a crime. A total of 35 participants watched a video of a crime. They were then interviewed one, two or three days later. Participants’ memory for the details of the crime was scored out of a total of 50.

  1. First, to check whether the allocation of participants to conditions was random, conduct an analysis of the average ages of the participants in the three groups. What statistical test will you run? (3 points)
  2. Is the result good news for the experimenters? Why? Indicate whether there are significant differences in age between the groups. (2 points)
  3. Test the hypothesis that the duration of the delay between encoding and recall will affect the accuracy of recall and report the result of your analysis. This is another statistical test. (5 points)
  4. Produce a boxplot showing recall at each delay. (2 points)
  5. Perform post‐hoc tests to determine whether each increase in delay results in a significant decrease in recall. Why do you run a post-hoc? Report your results. (6 points)
  6. Save and submit the SPSS syntax and output files used to complete items 1-5 above. The file names should begin with your first and last name followed by the homework number (e.g., John Doe HW6.sps; John Doe HW6.spv). (2 points)