When might imperfect multicollinearity not require the collecting of more data to remedy the likely imprecise estimates of the affected variables?

A. When the treatment effect is positive
B. When the imperfect multicollinearity is confined to control variables only
C. When the model suffers from heteroscedasticity as well
D. When you are only conducting hypothesis tests


Answer: B

Biology & Microbiology

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Foraging behaviors are those having to do with which of the following? (Check all that apply.) 

_____ how an animal avoids becoming the prey of a larger predator _____  how an animal finds its food _____  how much food an animal eats _____ what an animal eats _____ when an animal eats

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What is the type of diffusion in which water moves down a concentration gradient?

What will be an ideal response?

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Below is a figure from an experiment that was performed to measure the effect of carbonate ion (CO32-) concentration on the calcification (growth) rate of coral reefs. At which point on the graph is the ocean pH the lowest?


A) A
B) B
C) C
D) D

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