Use this scenario to answer the following question:A clinical psychologist is trying to find the most effective method for treating patients suffering fromaddiction. The psychologist randomly selects 18 people suffering from an addiction and randomlyassigns them to receive either individual counseling, group counseling, or no counseling for a year.The number of times that each patient relapsed was recorded below (note some other values havebeen provided to you to speed up your calculations. Is there sufficient evidence to indicate, at the5% level of significance, that the type of therapy received impacts rates of relapse?IndividualGroupCounseling Counseling CounselingNo1226.312711T=123616.SS=1658G=54ΣΧ328Question 20Find n?. Round to the second decimal place.

The formula to compute the effect size is, η2=SSbetweenSStotal

Answered: Use this scenario to answer the…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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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…
Research Scenario: A substance abuse counselor wants to demonstrate the effect of situational stress on alcohol cravings. He recruits two groups of men who are similar in respect to the history of alcohol use and demographic variables. He divides these participants into two groups. In one group (n=11), the men are exposed to a stressful situation and then asked to complete a measure rating their alcohol cravings on a scale from 0-10, where 0 represents no cravings and 10 represents intense cravings. In the second group (n = 10), the men are exposed to a neutral situation and asked to complete the same measure. The data are contained in the table below. Does a stressful situation result in more intense alcohol cravings than a non-stressful situation?Stressful Situation Neutral Situation Stressful Situation Neutral Situation 5 3 7 8 7 2 4 3 8 1 6 6 3 2 9 8 6 9 6 3 8
Recent research indicates that the effectiveness of antidepressant medication is directly related to the severity of the depression (Khan, Brodhead, Kolts & Brown, 2005). Based on pretreatment depression scores, patients were divided into four groups based on their level of depression. After receiving the antidepressant medication, depression scores were measured again and the amount of improvement was recorded for each patient. The following data are similar to the results of the study. LowModerate HighModerate ModeratelySevere Severe 0.5 2.7 3.4 2.6 1.7 0.8 2.6 5.3 3.3 1.9 1.1 4 2.6 1.4 4.3 2.6 1.4 2.9 3.6 4.6 3.1 3.2 4.8 1.4 From this table, conduct an one-way ANOVA. Calculate the F-ratio and p-value. Be sure to round your answers to three decimal places. Assume all population and ANOVA requirements are met.F-ratio: p-value:
Betsy is interested in predicting how many 75-year-olds will develop Alzheimer’s disease and is using as predictors level of education and general physical health graded on a scale from 1 to 10. But she is interested in using other predictor variables as well. Answer the following questions:What criteria should she use in the selection of other predictors? Why?Name two other predictors that you think might be related to the development of Alzheimer’s disease.With the four predictor variables—level of education and general physical health and the two new ones that you named in (b)—draw out what the model of the regression equation would look like.
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An experimenter investigated the effects of blue light exposure on people’s sleep quality. Researchers get 50 people and randomly assign 25 people to be exposed to blue light for 20 min. before bed and the other 25 people to have no blue light exposure 25 min. before bed. Each participant is sent to bed at 10pm and woken up at 7am the next morning. When all participants are woken up, they must fill out a sleep quality questionnaire. The scores seen below represent participants’ sleep quality ratings where higher numbers indicate better sleep quality. Does the blue light exposure negatively impact sleep quality? Blue light No Blue light 11 13 14 16 10 14 11 17 8 13 15 14 12 15 13 18 9 12 11 12 1. Analyze the data by hand or with SPSS/PSPP/JASP using the most…
In a study assessing helping behavior among college students on their way to class, you recruit 10 students. You tell some participants that they are late for class and need to rush. You tell others they are right on time. Finally, you tell others they have lots of time before class. As they walk across campus, they come across a man (actually a confederate) who appears to need help. You measure the extent to which the participant noticed that the confederate needed help (1 = did not notice to 9 = really noticed). State the null hypothesis. Ho: µ1 = µ2 = µ3 Ho: X1 ≠ X2 ≠ X3
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 = 15 n = 20 M = 18 M = 22 SS = 172.5 SS = 135.0 a. What research design was used to answer this question? b. What was the scale of measurement for the dependent variable? c. What was the scale of measurement for the independent variable? d. Does the drug have a significant effect on aggression? Use an alpha level of .05, two tails. e. Compute r2 and write an…
According to the February 2008 Federal Trade Commission report on consumerfraud and identity theft, 23% of all complaints in 2007 were for identity theft. Inthat year, Arkansas had 1,601 complaints of identity theft out of 3,482 consumercomplaints ("Consumer fraud and," 2008). Does this data provide enoughevidence to show that Arkansas had a higher proportion of identity theft than23%? Test at the 5% level.
Recent research indicates that the effectiveness of antidepressant medication is directly related to the severity of the depression (Khan, Brodhead, Kolts & Brown, 2005). Based on pretreatment depression scores, patients were divided into four groups based on their level of depression. After receiving the antidepressant medication, depression scores were measured again and the amount of improvement was recorded for each patient. The following data are similar to the results of the study. LowModerate HighModerate ModeratelySevere Severe 0 1.3 3.9 3.3 3.1 3.1 3.8 4.3 1.5 4.5 3.3 1.8 1.9 2.9 3.6 3.8 1.8 0.7 2 3.7 1.6 1.6 2.1 3.3 From this table, conduct an one-way ANOVA. Calculate the F-ratio and p-value. Be sure to round your answers to three decimal places. Assume all population and ANOVA requirements are met.F-ratio: p-value:

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