A researcher wanted to examine if soil type had any effects on the heights of daylilies. Ten bulbs of daylilies were planted in each of the three different types of soil. The thickness of the soil X) was also measured for each pot. After three months, the heights of the plants
Y) were measured. Below are the group means of the study.

-If ANCOVA is used, which group will have the highest adjusted mean height?
A) Group 1 ('1.)
B) Group 2 ('2.)
C) Group 3 ('3.)
D) All groups would have the same adjusted mean.
E) Any of the above situations is possible (not enough information provided).

Question

A researcher wanted to examine if soil type had any effects on the heights of daylilies. Ten bulbs of daylilies were planted in each of the three different types of soil. The thickness of the soil  X) was also measured for each pot. After three months, the heights of the plants
 Y) were measured. Below are the group means of the study.

-If ANCOVA is used, which group will have the highest adjusted mean height?
A) Group 1 ('1.) 
B) Group 2 ('2.) 
C) Group 3 ('3.) 
D) All groups would have the same adjusted mean. 
E) Any of the above situations is possible (not enough information provided).

Quizplus · Accepted Answer

Without knowing b_w, any adjustment of means is possible.)

A Researcher Wanted to Examine If Soil Type Had Any