Question: Select the correct entries from the dropdown menus to complete the following table of possible results when analyzing the effect of a third variable Z

Select the correct entries from the dropdown menus to complete the following table of possible results when analyzing the effect of a third variable Z on the relationship between two variables X and Y.

Compared with Bivariate Table, Partial Tables Show Pattern Implications for Further Analysis Likely Next Step
Same relationship between X and Y (gammas for partial tables within 0.10 of bivariate gamma)

Interaction,

Direct,

Spurious/intervening

Incorporate Z,

Disregard Z

Analyze another Z variable
Weaker relationship between X and Y (gammas from partial tables at least 0.10 weaker than bivariate gamma)

Interaction,

Direct,

Spurious/intervening

Incorporate Z,

Disregard Z

Focus on relationship between Z and X or among X, Y, and Z
Mixed (at least 0.10 difference in gammas between partial tables and between partial tables and bivariate table)

Interaction,

Direct,

Spurious/intervening

Incorporate Z,

Disregard Z

Analyze subgroups (categories of Z) separately

Consider the following bivariate table showing the relationship between job satisfaction (low or high) and longevity, that is, the time working for the company (low = less than 2 years, high = 2 years or more), among workers for a fast-food chain.

Job Satisfaction (X)
Longevity (Y) Low High Totals
Low 14 (28.0%) 27 (58.7%) 41
High 36 (72.0%) 19 (41.3%) 55
Totals 50 (100.0%) 46 (100.0%) 96
Gamma = -0.5703

The data in the table suggest that there is no, a positive, a negative, or a perfect association between job satisfaction (X) and longevity (Y).

Here are the partial tables showing the bivariate relationship between X and Y after controlling for gender.

Job Satisfaction (X)
Longevity (Y) Low High Totals
Low 11 (68.8%) 26 (72.2%) 37
High 5 (31.3%) 10 (27.8%) 15
Totals 16 (100.0%) 36 (100.0%) 52
Gamma = -0.0833

B. Women

Job Satisfaction (X)
Longevity (Y) Low High Totals
Low 3 (8.8%) 1 (10.0%) 4
High 31 (91.2%) 9 (90.0%) 40
Totals 34 (100.0%) 10 (100.0%) 44
Gamma = -0.0690

Compared with the bivariate table, the partial tables show the same, a mixed, a weaker, or a stronger relationship between job satisfaction and longevity. This is evidence of a direct, an interactive, a spurious or intervening, or a fallaciousrelationship between the X and Y variables and implies that you should incorporate, modify, disregard, elaborate the variable Z (gender) in further analysis.

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