Answers for Assignment_8 (Fall 2008)

Answers for Assignment_8 (Fall 2008) - STAS2126...

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STAS2126 Assignment#8 (Fall 2008) Submit to Dropbox not by email…Use your first and last name as the file name… Do NOT use # symbol as part of the file name…Show your work for calculation questions not just final answer or you will lose marks Pre-Engagement Cohabitation and Marital Outcomes Is it a good idea to live together before marriage? Data from a longitudinal study were used to examine differences among couples that cohabited before engagement, after engagement, or not until marriage. Researchers collected data that looked at how the couples got along with each other and the nature of interactions. Actual results of this research are shown in the table below. 1. Was there random assignment in this study (in other words, did the researcher control who lived together before engagement, after engagement, or at marriage)? You have to think about this…answer is not given above. No…you do not have to even read the details of the study to realize that, in this situation, random assignment is not feasible. Researchers simply do not have that degree of control over people’s lives (Stop the marriage…we haven’t collected our pretest data yet!!!). 2a. Three groups are being compared in the above table. What are the three groups? Before engagement, After engagement, At marriage 2b. When comparing three groups as we are doing above what analysis is best, t-test or ANOVA? Why? ANOVA because t-test can be used to compare only TWO groups…ANOVA can be used to compare 2, 3, 4 or more groups 3. The major results of the study are shown in the table ABOVE. Which group is doing best and which group is doing worst based on these results (e.g., look at means)? Briefly refer to the means for TWO of the measures when explaining your answer. (ANY TWO MEASURES WERE ACCEPTABLE) Psychological aggression At marriage group has lowest mean and so is doing better Relationship quality At marriage group has highest mean and so is doing better Interpersonal commitment At marriage group has highest mean and so is doing better 4. According to Cohen’s d values in the above table, it appears that “Relationship quality” has an effect size twice as large as the effect size for “Observed positive interaction”. Use the formulas page to identify the % of variance for each measure. Use the % to determine exactly how many times larger the effect size is for “Relationship quality”. Relationship quality % variance = 13.8% Observed positive interaction % variance= 1.0% Effect size for relationship quality is about 14 times larger (Cohen’s d is deceptive) A demographics questionnaire gathered descriptive information about the study sample (e.g., age, race, income, education, and presence of children). Partners were also asked for the length of the current relationship, the date of their engagement, and the date that they moved in together. Also, religiosity was measured with the simple question “All things considered, how religious would you say that you are?” Scores ranged from 1 (not at all) to 7 (very religious).
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This note was uploaded on 11/16/2009 for the course BBA STAS2126 taught by Professor F.sicoly during the Fall '08 term at Laurentian.

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Answers for Assignment_8 (Fall 2008) - STAS2126...

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