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

Biology & Microbiology

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