Question

In: Statistics and Probability

A child psychologist treats four children who are afraid of snakes with a behavioral modification procedure...

A child psychologist treats four children who are afraid of snakes with a behavioral modification procedure called systematic desensitization. In this procedure, children were slowly introduced to a snake over four treatment sessions. Children rated how fearful they are of the snake before the first session (baseline) and following each treatment session. Higher ratings indicated greater fear. The hypothetical data are listed in the table.

Sessions
Baseline 1 2 3 4
7 7 5 4 3
7 6 6 4 4
6 6 7 7 3
7 7 5 4 3

(a) Complete the F-table. (Round your value for F to two decimal places.)

Source of
Variation		 SS df MS Fobt
Between
groups
Between
persons		   
Within
groups (error)		   
Total      


(b) Compute a Bonferroni procedure and interpret the results. (Assume experimentwise alpha equal to 0.05.)

Ratings of fear significantly decreased from Session 1 to Session 4. Ratings of fear also significantly decreased from Session 2 to Session 4.

Ratings of fear significantly decreased from baseline to Session 3. Ratings of fear also significantly decreased from Session 1 to Session 4.     

Ratings of fear significantly decreased from baseline to Session 3. Ratings of fear also significantly decreased from baseline to Session 4.

None of the pairwise comparisons are significant.
Ratings of fear significantly decreased from baseline to Session 4.

Solutions

Expert Solution

Answer:

b) Ratings of fear significantly decreased from Session 1 to Session 4. Ratings of fear also significantly decreased from Session 2 to Session 4.

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orchestra answered 2 years ago
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