Use this scenario to answer the following question: A clinical psychologist is trying to find the most effective method for treating patients suffer addiction. The psychologist randomly selects 18 people suffering from an addiction and ran assigns them to receive either individual counseling, group counseling, or no counseling for a The number of times that each patient relapsed was recorded below (note some other value been provided to you to speed up your calculations. Is there sufficient evidence to indicate, 5% level of significance, that the type of therapy received impacts rates of relapse?

Four studies were done to measure the risk of heart attack among males who were age 60 years at enrollment. Each study subject was followed for the entire follow-up period; there were no drop-outs or loss to follow-up. Details from each of these studies is shown below.    # of subjects  Time followed Number of cases  Study 1 100 10 years 10 0.10 Study 2 200 7 years 14 0.07 Study 3 300 5 years 18 0.06 Study 4 400 2 years 8 0.02 Is it correct to conclude that the risk (shown in th last column) of heart attack was greatest in Study 1? Choose the best answer.   a) It is incorrect. For each study, one must divide the number of new cases by the total number of accumulated person*years in order to compare the risks. b)It is incorrect. The follow-up period is different for each study. One cannot directly compare a 10-year risk with (for example) a 7-year risk.

A researcher conducts an independent-measures study examining how the brain chemical serotonin is related to aggression.  One sample of rats serves as a control group and receives a placebo that does not affect normal levels of serotonin.  A second sample of rats receives a drug that lowers brain levels of serotonin.  Then the researcher tests the animals by recording the number of aggressive responses each of the rats display.  The data are as follows.                                                Control         Low Serotonin                                                    n = 10                 n = 15                                                M = 14               M = 19                                                SS = 180.5         SS = 130.0 A. Does the drug have a significant effect on aggression?Use an alpha level of .05, two      tails.   H0 = ________________________________________   df = _________________________________________             tcritical =…

When people are anxious, they tend to be depressed. When they are depressed, they tend to be anxious. The relationship between anxiety and depression is well-known to psychologists, but why that relationship exists is not well understood. Does one lead to the other? Are they both part of the same disorder? Suppose you are exploring how measures of anxiety and depression predict future suicide attempts among women aged 20 to 29. You use the Beck Depression Inventory (BDI) to measure depression and the Beck Anxiety Inventory (BAI) to measure anxiety in a sample of 842 women aged 20 to 29. Both inventories consist of 21 questions with a possible 3 points per question. Thus, each measure ranges in value from 0 to 63.   1. Which of the following measures or tests would be appropriate to apply to the two numerical scores (without any recoding) to ascertain the strength of the relationship between the BDI and the BAI in your sample of women aged 20 to 29? (Hint: By “recoding” we mean…