50.1K

Verified Solution

Link Copied!

Ad Lib Cntrol	Two per Day Control	Food Deprived	Water Deprived	Food and Water Deprived
18	20	6	15	12
20	25	9	10	11
21	27	8	9	8
16	23	6	12	13
15	25	11	14	11
90	120	40	60	55

Data represent the effects of food and/or water deprivation onbehavior. Treatments 1 and 2 represent control conditions; animalreceived ad lib food and water (1) or else food and water twice perday (2). In treatment 3 animals were food deprived, in treatment 4they were water deprived, and in treatment 5 they were deprived ofboth food and water. The dependent variable is the number of trialsto reach a predetermined criterion. Assume we compared the combinedcontrol groups (treatments 1 and 2) with the combined experimentalgroups, the control groups with each other, the singly deprivedtreatments with the doubly deprived treatment, and the singlydeprived treatments with each other

1. Fill out the table below based on the comparisons (linearcontrasts)

Groups	Ad Lib Cntrol	Two per Day Control	Food Deprived	Water Deprived	Food and Water Deprived	Sum aj	Sum a^2j	Omega= Sum(ajX-barj)
Sample Means
aj
bj
cj
dj

1. Compute:

Sum ajbj

Sum ajcj

Sum ajdj

Sum bjcj

Sum bjdj

Sum cjdj

Are the four contrasts orthogonal? Explain.

1. Use the results of your computations for part a) to completethe following table.

Source	df	SS	MS	F	Sig (Y or N)
Treatments
     Contrast 1
     Contrast 2
     Contrast 3
     Contrast 4
Error
Total

1. Interpret the results for Contrast 1.
2. Taking into account all four contrasts, what do the resultstell us about the effect of food/ water deprivation on the learningtask?