In an experiment to test a memory supplement, 200 subjects were assigned randomly to take the supplement or a placebo (100 in each group). The memory score of each group was then measured. Can you support the claim that there is a difference in the mean memory scores between the supplement and placebo groups? Conduct the test with a significance level of 10%. Results and p-values many test runs are shown below. Supplement Placebo 5.23 sample mean sample std dev sample size 6.61 5.03 4.10 100 100 Reported p-values two tail left tail right tail F-test for variances 0.033 pooled variance t-test 0.032 0.984 0.016 unequal variance t-test matched pairs t-test 0.038 0.981 0.019 0.048 0.976 0.024

If the alternative hypothesis states that alcohol affects short-term memory, the null hypothesis states O alcohol does not affect short-term memory O alcohol decreases short-term memory alcohol does not decrease short-term memory

Using SPSS, analyze the relationship between respondents’ marital status (MARITAL) and whether they believe it is alright for a couple to live together without intending to get married (COHABOK) using crosstabulation.  Which marital status category is most disapproving of nonmarital cohabitation?  Which marital status category is most approving of nonmarital cohabitation?  Is the relationship between marital status and attitude toward nonmarital cohabitation statistically significant at the .05 level?  Compute and interpret an appropriate measure of association for this relationship.

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Ophthalmology The following data are from a study on Botox injections. Patients received a high-dose injection in one eye (experimental treatment = treatment E) and a low-dose injection in the other eye (control treatment = treatment C). Patients were asked to rate the level of pain in each eye on a 1-10 scale, with higher scores indicating more pain. The assignment of treatments to eyes was randomized. The subjects came back over several visits. Data from the last visit are given in the table below. Effect of Botox injection on eye pain Subject 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pain score at the last visit Pain in E eye Pain in C eye 1.3 7.3 0.0 0.0 3.0 0.0 3.5 0.0 0.0 2.0 0.0 3.0 5.0 0.3 0.0 4.3 USE SALT 8.7 1.4 0.9 9.6 7.9 9.1 5.1 2.2 2.6 7.9 4.4 4.6 9.1 7.4 0.4 0.7 UNİ TANTE ELANIKE Cunnnen win wich to compare the nain score in the E eve vs. the pain score in the C eye.

One of your colleagues is interested in running individual t-tests to compare dogs and cats for each of the 25 personality metrics. You are advocating for using just two principal components that summarize much of the dataset. What is your reasoning? By chance alone, you colleague is likely to detect at least one significant test result, even if it is not truly significant – this is known as a type 1 error By chance alone, you colleague is likely to detect at least one significant test result, even if it is not truly significant – this is known as a type 2 error By chance alone, you colleague is likely to detect at least five significant test results, even if it is not truly significant – this is known as a type 1 error By chance alone, you colleague is likely to detect at least five significant test results, even if it is not truly significant – this is known as a type 2 error