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- Ankit16) The following summary table presents the results from an ANOVA comparing three treatment conditions withn=8 participants in each condition. Complete all missing values. (Hint: start with the df column.) Source SS df MS Between treatments F = Within treatments Total 93 TERRELL PSYC 241 Page 2 of 3 Homework questions based on problems from Gravetter and Wallnau (2014) 18) 15Based on these tables, would you accept or reject the hypothesis that individuals in bad neighborhoods commit more crime?
- 3. To test the null hypothesis HO: µ1 = µ2 = µ3 using samples from normal populations with unknown but equal variances, we A) cannot safely use ANOVA. B) can safely employ ANOVA. C) would prefer three separate t-tests. D) would need three separate z-tests.Which of the following correctly describes the null and alternative hypotheses for an analysis of variance between three treatment groups (µ1 µ2 µ3)? A) Ho: µ1= µ2, Ha: µ1? µ2 B)Ho: µ1 = µ2 = µ3, Ha: µ1? µ2 C) Ho: µ1 = µ2 = µ3, Ha: At least 2 means differ D) Ho: µ1 = µ2 = µ3, Ha: All means differ THANK YOU!11)
- 3. Which of the following is not correct? a) a high R2 does not mean that the regression is correct b) a high R2 does not mean that there is no omitted variable bias c) one should always choose a regression with a higher R2. d) a high R2 does not necessarily mean that you have the most appropriate set of regressorsThe article “The Effect of Restricting Opening Hours on Alcohol-Related Violence” (S. Duailibi, W. Ponicki, et al., American Journal of Public Health, 2007:2276–2280) presented homicide rates for the years 1995–2005 for the town of Diadema, Brazil. In 2002, a law was passed requiring bars to close at 11 pm each night. After the law's passage, the homicide rate dropped by an average of 9 homicides per month, a statistically significant decrease. Which of the following is the best conclusion? a) It is reasonable to conclude that the law is responsible for a reduction of 9 homicides per month. b) It is reasonable to conclude that the law is responsible for a reduction in homicides, but the actual amount might be somewhat more or less than 9 per month. c) It is reasonable to conclude that the homicide rate decreased, but the law may not have anything to do with the decrease. d) It is plausible that the homicide rate may not have decreased at all after the passage of the law.Reviewers from the Oregon Evidence-Based Practice Center at the Oregon Health and Science University investigated the effectiveness of prescription drugs in assisting people to fall asleep and stay asleep (source: S. Carson, M.S. McDonagh, et al., “Drug class review: Newer drugs for insomnia,” Oregon Health and Science University, 2008, http://www.ncbi.nlm.nih.gov). Suppose a study of two drugs, Sonata and Ambien, was conducted and the resulting data are contained in a file titled Shuteye. The samples reflect an experiment in which individuals were randomly given the two brands of pills on separate evenings. Their time spent sleeping was recorded for each of the brands of sleeping pills. (A) Does the experiment seem to have dependent or independent samples? Explain your reasoning. (B) Do the data indicate that there is a statistical difference in the mean time spent sleeping for people using the two drugs? Test using alpha = 0.02. Conduct a statistical procedure to determine this. (C)…
- 3. Let X, X2, .. X5, be a random sample from a population having mean u and variance o?, and let ô, =(x, + X, + X, + X,) and ô, =(2x, + X, + X, - X,) be two estimates of u. * Which of these two estimators is unbiased? * Which is the better estimator, and why? %3D10.) The data in the table is from a study entitled “Does It Pay to Plead Guilty? Differential Sentencing and theFunctioning of the Criminal Courts,” by Brereton and Casper, Law and Society Review, Vol. 1, No. 1.Plea of Guilty Plea of Not GuiltySentenced to Prison 392 58Not Sentenced to Prison 564 14a.) What is the probability of picking one of the subjects and selecting someone that was sentenced toprison?b.) What is the probability of picking four subjects that all avoided prison?c.) What is the probability of selecting someone that pled not guilty or was sentenced to prison?There is a theory that music increases productivity of workers. The new vice president formanufacturing operations, however, believes that music can distract the workers’concentration. To prove his point, he requested the operations manager to conduct anexperiment for one week and find out if music indeed has an effect on workers’ productivity.Two groups of assembly line workers were randomly assigned to the three music conditions(without music, and with light instrumental). Furthermore, the average productivity ofworkers during the week prior to the experiment was obtained as baseline data. Thefollowing data were reported. Test the null hypothesis that productivity is the same foremployees who listen to music and those who do not. Test also the null hypothesis thatthere is no difference in the productivity of individual workers before and after listening tomusic while at work. Test both null hypotheses at α = .05.