In testing if promotions (binary) Pi have an effect on sales, Si with a null hypothesis that the average treatment effect is zero, the null hypothesis could be written as:
A. E [Si (Pi = 1) - Si (Pi = 0)] = 0
B. E [Pi - Si ] = 0
C. E [Si (Pi = 1) - Si (Pi = 0)] = ETT
D. E [Pi - Si ] = 1
Answer: A
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In a simple laboratory experiment, a researcher maintained two different species of single celled protists, Paramecium caudatum and Paramecium aurelia
He recorded population growth of each species individually and then mixed a similar number of individuals from each population and recorded their growth rates when living together. The graphs below represent the results of this experiment.
Radially symmetrical animals have a nerve
__________. Fill in the blank(s) with the appropriate word(s).
The slender stalk that connects the flattened leaf blade to the stem in most eudicots is the
A. vein. B. stele. C. receptacle. D. meristem. E. petiole.
Which of the following is NOT one of the 5 general steps of biotechnology?
Amplify a small amount of DNA Chop up DNA from a donor species Identify colonies that have received DNA containing the gene of interest Grow separate colonies containing different inserted pieces of donor DNA Insert different DNA segments into human cells to be grown and studied