instruction:
In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
question:
Tetrachoric correlation is _ artificially dichotomous variables.
answer:
two


question:
Phosphates are made of _ phosphorus atom surrounded by four oxygen atoms.
answer:
one


question:
Healthy lungs are an intricate weave of more than _ hundred million tiny air sacs.
answer:

three