Is a reduction in the number of research participants as some drop out of the study over time.
a) attrition
b) experimenter bias
c) single blinding
d) generalizability

The correct answer is letter A

Explanation: Attrition is a reduction in the number of research participants as some drop out of the study over time.

it is due to the halo effect as the impression of the boy created earlier.on the mind of the principle affected his decision

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the correct answer is :

{b.}   ( american workers lose job opportunities )

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