Sixty-four male students were ordered, after they had violated university alcoho

Question

Sixty-four male students were ordered, after they had violated university alcohol rules, to meet with a school counselor. Borsari and Carey(2005) randomly assigned these students to one of two conditions. Those in the first condition were assigned to undergo a newly developed brief motivational interview, an intervention in which educational material relates to the student's own experiences; those in the second condition were assigned to attend a standard alcohol education session in which educational material is presented with no link to students experiences. based on inferential statistics, the researchers concluded that those in the BMI group had fewer alcohol-related problems at follow-up, on average, than did those in the AE group. what is the population of interest, and what is the sample in the study? a.What is the population of interest, and what is the sample in this study? b. Was a random selection likely used? Explain your answer. c. Was a random assignment likely used? Explain your answer. d. What is the independent variable and what are its levels? What is the dependent variable? e. What is the null hypothesis and what is the research hypothesis? f. What decision did the researchers make? (Respond using the language of inferential statistics) g.If the researchers were incorrect in their decision, what kind of error did they make? Explain your answer What are the consequences of this type of error, both in general and in this situation?

Explanation / Answer

a. Population is university students with alcohol problems.

Sample in the study was Sixty four male students who violated university alcohol rules

b.No random selection was not used in the study. Incidental sampling was used in the study. Students who violated the rules were selected for the study.

c. Random assignment of interventions was used in the study. The students were randomly selected for each intervention.

d. Independent variable is the type of intervention- BMI and AE. Dependent variable was incidence of alcohol problems

e. Null hypothesis- There will be no significant difference between the group administered with BMI and the group administered with AE

g. The researchers concluded that the group administered with BMI had lower alcohol problems in the followup

h. If the researchers were incorrect in their decision, it would make a type I error ( alpha error) by rejecting null hypothesis when it is true. This would result in a false positive; the researchers made an erroneous decision by concluding that one intervention is better than other when, in fact, both of them are the same.

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