PSY 305 Assignment 3

Instructions- Calculate this ANOVA by hand.  Check your work by also calculating the ANOVA in SPSS or EXCEL.  Be sure to do any multiple comparison tests and interpret the results.

SS_T = SX² – T²/an                             (also called [X] – [T])

SS_T =                                                  (a = number of groups, n = number in each group)

SS_T =

SS_A = SA²–   T²                                 (also called  [A] – [T])

n        an

SS_A =

SS_A =

SS_S/A = SX² – SA²                                        (also called [Y] – [A] )

N

SS_S/A =

Now divide by its df to change it to variance.  Variance is called Mean Square.

Complete ANOVA summary table on next page.

ANOVA Summary Table

Source                                   SS                   df                     MS                  F

A-group

S/A (error)

Total

Find F-critical.

Are the groups significantly different?

Write the results statistically.

What do you do next?  Why?

Which groups are different?

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