A cognitive psychologist is interested in whether the quantity of information that can be held in short-term memory varies depending on the type of information to be learned.She tests 18 participants, where each participant receives either: digits only, letters only, and a mixture of digits and letters. The maximum short-term memory span for each participant under each condition is listed below. undefined Create a dataset with the data provided.Make sure to name your variables and set all characteristics appropriately.

A cognitive psychologist is interested in whether the quantity of information that can be held in short-term memory varies depending on the type of information to be learned. She tests 18 participants, where each participant receives either: digits only, letters only, and a mixture of digits and letters. The maximum short-term memory span for each participant under each condition is listed below.

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Create a dataset with the data provided. Make sure to name your variables and set all characteristics appropriately.

 

PSYC 311

In Class Assignment 8

 

One-way ANOVA

 

Part I. To be completed in SPSS.

 

A cognitive psychologist is interested in whether the quantity of information that can be held in short-term memory varies depending on the type of information to be learned.  She tests 18 participants, where each participant receives either: digits only, letters only, and a mixture of digits and letters. The maximum short-term memory span for each participant under each condition is listed below.

 

Create a dataset with the data provided.  Make sure to name your variables and set all characteristics appropriately.

 

DATA SET

 

Digits Letters Mixed
6 5 6
8 5 5
9 7 4
8 5 6
6 4 7
7 6 5

 

  1. Conduct the appropriate one-way ANOVA to examine whether there was a significant difference among the stimuli.  As part of this analysis, request post-hoc comparisons for all pairs of groups and descriptive statistics.

 

  1. Explain why post-hoc comparisons are appropriate for the current analysis.  Also explain under what circumstances post-hoc comparisons would not have been appropriate.

 

 

  1.  Interpret fully and clearly the results of your analysis within the context of this sample problem.  While you should describe the outcome in ordinary prose, you should also provide the statistical information required to verify your information according to APA format.

 

  1. Explain how each portion of the ANOVA table is calculated, ultimately leading to the F statistic.

 

 

 

Part II. Complete the ANOVA table below using the study description. Answer the questions to determine if there is in fact a significant difference between the three groups.

 

A psychologist would like to examine the effects of sugar consumption on the activity level of preschool children.  Three samples of children are selected with n = 5 in each sample.  One group gets no sugar, one group gets a small dose, and the third group gets a large dose.  The psychologist records the activity level for each child.  The data from this experiment are presented below.

  1. Do these data indicate any significant differences among the three groups? Test with

α = .05.

  1. Compute η2 , the percentage of variance accounted for by the treatment.
  2. Write a paragraph to summarize the results in APA format.

No sugar      Small dose      Large dose     

5                   3                    6

3                   3                    8

1                   7                    5

1                   4                    2

     5                   3                    4        

 

 

       Source                   SS                 df                     MS              F     

Between Treatments      10                ___________________  

Within Treatments                        ______________________   

Total                              58      ________________________

 

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