Experimental studies use blinding to prevent researchers from biasing theirmeasurements of the subjects. In a study of a drug intervention, a clinician who was"blinded" was asked to guess what treatment each subject received. Data from thatexperiment are shown below. Suppose a person is to be chosen at random from thesubjects in this study.
a) What is the probability that the clinician made a correct guess for the selectedsubject?
b) What is the probability the selected subject received the drug treatment?
c) What is the probability the selected subject will be one for whom the cliniciancorrectly guessed as having received drug treatment?
d) What is the probability the selected subject will be one for whom the clinicianguessed correctly or who received the standard treatment?
e) What is the probability the selected subject will be one for whom the clinicianguessed correctly and who received the standard treatment?
f) In a few sentences, explain why the probabilities calculated in parts (d) and (e)differ.

Question

Experimental studies use blinding to prevent researchers from biasing theirmeasurements of the subjects. In a study of a drug intervention, a clinician who was"blinded" was asked to guess what treatment each subject received. Data from thatexperiment are shown below. Suppose a person is to be chosen at random from thesubjects in this study.  
a) What is the probability that the clinician made a correct guess for the selectedsubject?
b) What is the probability the selected subject received the drug treatment?
c) What is the probability the selected subject will be one for whom the cliniciancorrectly guessed as having received drug treatment?
d) What is the probability the selected subject will be one for whom the clinicianguessed correctly or who received the standard treatment?
e) What is the probability the selected subject will be one for whom the clinicianguessed correctly and who received the standard treatment?
f) In a few sentences, explain why the probabilities calculated in parts (d) and (e)differ.

Quizplus · Accepted Answer

The Answer of Experimental studies use blinding to prevent researchers from biasing theirmeasurements of the subjects. In a study of a drug intervention, a clinician who was"blinded" was asked to guess what treatment each subject received. Data from thatexperiment are shown below. Suppose a person is to be chosen at random from thesubjects in this study.  
a) What is the probability that the clinician made a correct guess for the selectedsubject?
b) What is the probability the selected subject received the drug treatment?
c) What is the probability the selected subject will be one for whom the cliniciancorrectly guessed as having received drug treatment?
d) What is the probability the selected subject will be one for whom the clinicianguessed correctly or who received the standard treatment?
e) What is the probability the selected subject will be one for whom the clinicianguessed correctly and who received the standard treatment?
f) In a few sentences, explain why the probabilities calculated in parts (d) and (e)differ.

Experimental Studies Use Blinding to Prevent Researchers from Biasing Theirmeasurements