RESEARCH STUDY: Dr. Ickes is interested in studying the pote…

RESEARCH STUDY: Dr. Ickes is interested in studying the potential causal relationship between doing homework and academic achievement. In January, Dr. Ickes has her students report their Fall GPA (a measure of academic achievement) and estimate how many hours they spent doing homework during a typical week in the Fall semester. In April, Dr. Ickes measures the same variables again (the estimated number of hours spent doing homework during a typical week in the Spring semester and their Spring GPA). She finds the following correlations. In considering the three criteria for causation, which of the following questions will Dr. Ickes’ study NOT be able to address?

RESEARCH STUDY: Dr. Guidry conducts a study examining the re…

RESEARCH STUDY: Dr. Guidry conducts a study examining the relationship between the number of friends one has and the experience of daily stress and life satisfaction. She randomly samples 1,500 elderly men and women in Nashville, Tennessee. Below are her findings: Life satisfaction and experience of daily stress: r = –.57, 95% CI Number of friends one has and experience of daily stress: r = .09, 95% CI Number of friends one has and life satisfaction: r = .36, 95% CI Dr. Guidry finds that the relationship between the number of friends one has and life satisfaction is stronger for men than for women. In this study, gender (male or female in this study) is considered a(n)

Extra Credit (1 point, no penalty for incorrect answer). A r…

Extra Credit (1 point, no penalty for incorrect answer). A researcher reports a significant relationship between hours spent doing homework and academic achievement (i.e., the more time spent doing homework, the higher their GPA). A colleague questions the internal validity of this claim. The colleague is curious as to whether the relationship between homework and academic achievement could be explained by interest in one’s classes. Specifically, the colleague thinks that students who are interested in their classes will both do more homework and have higher GPAs. Which of the following is a solution to this possible threat to internal validity?

RESEARCH STUDY: Dr. Finkel is a social psychologist who stud…

RESEARCH STUDY: Dr. Finkel is a social psychologist who studies romantic relationships. Several researchers have found that there is a link between income and marital satisfaction (e.g., Dakin & Wampler, 2012). Dr. Finkel is curious as to whether there is a causal link between the two variables, such that having a higher income causes higher levels of marital satisfaction. He is confident that he cannot reasonably or ethically manipulate people’s income level, so he decides to use a multivariate design. He is also curious as to whether there is a causal link between these two variables or if two other variables (number of arguments and life satisfaction) can explain the relationship. He measures these variables in a sample of 124 married couples recruited from a local community center. Below are his results: PLEASE NUMBER YOUR RESPONSES 1-5 BELOW. Which of these variables serve as the criterion variable in Dr. Finkel’s study? According to the results in the table, what is the strongest predictor of the criterion? Describe the results of the strongest predictor in a complete sentence. Be as specific as possible. How are standardized betas different from bivariate correlation (r)? A friend looks at the data from this study and says, “The only reason the income is associated with marital satisfaction is life satisfaction —people more satisfied with life probably make more money, and people more satisfied with life are probably also more satisfied with their marriages. What do you say back to your friend?  

CASE REPORT: A 70-year-old man is admitted to the hospital w…

CASE REPORT: A 70-year-old man is admitted to the hospital with congestive heart failure. He gives a history of angina pectoris of several years’ duration, with recent exacerbation of symptoms, such as onset of left-sided chest pain after exercise and, occasionally,dyspnea.The pain is usually relieved by ceasing the strenuous activity and placing nitroglycerin tablets sublingually. Hypertension may increase during the attack, and arrhythmias may occur. According to this report, the patient has a history of: