• April 19th, 2016

Communications

Paper, Order, or Assignment Requirements

When you are working on this assignment, make sure that you include the calculation process. You may find the step-by-step process to calculate the t-test and chi square in the course package (p. 77-83). Also, after you decide whether to reject (or fail to reject) the null hypothesis, you need to also conclude whether or not you are 95% confident that there is a difference between 2 groups in the scores.

CASE STUDY 10

STATISTICAL ANALYSIS (III)

 

In a study dealing with the relationship between exposure to different film materials and comforting behavior, a sample of 44 college students was selected and randomly assigned to one of the three film conditions: comedy, tragedy, and horror. After viewing a 30-minute film, each subject’s comforting behavior in an interaction with a distressed confederate was observed by the experimenter through a two-way mirror. The subject’s comforting behavior was rated on a nine-point scale (9 being most sensitive and 1 being least sensitive). The raw scores of the subjects in each condition were reported as follows:

 

Comedy Horror Tragedy
5 9 5
9 2 3
7 4 8
8 3 9
8 3 2
9 6 3
1 4 6
9 8 4
8 2 6
6 1 1
8 2 9
9 4 2
7 5 3
8 2 9
3 5  
N = 15 N = 15 N = 14

 

Based on the data provided, complete the following:

 

  1. Calculate a t-test on the mean scores in each pair of film conditions. For each test: (a) state the degrees of freedom and critical value for each test, and (b) state whether or not the difference is significant. You must show all your work in order to receive full credit.

 

    1. Comedy and horror

 

 

 

 

 

    1. Horror and tragedy

 

 

 

 

    1. Comedy and tragedy

 

 

 

 

 

  1. For the purpose of another statistical analysis, the data above have been transformed and entered in the table below. Comforting scores have been divided into three groups: low (1 through 3), medium (4 through 6), and high (7 through 9) comforting. The number in each cell represents the number of subjects who fall in that cell. Calculate a χ2 test to analyze the differences in comforting behavior between the conditions. You also need to (a) state the degrees of freedom and critical value for the test, and (b) state whether or not the difference is significant. You must show all your work to receive full credit.

 

    Film Condition
    Comedy Horror Tragedy
Comforting Level High 11 2 4
Medium 2 6 4
Low 2 7 6

 

 

 

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