Question

introduction to statistics review
independent practice
a sleep study is set up in which those with chronic sleep disorders are given a new medication. some patients received a sugar pill and others received the medication. what element of experimental design is known to be part of this study?
a. stratification
b. blinding
c. randomization
d. replication
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Explanation:

In the study, some patients get a sugar - pill (placebo) and others get the actual medication. Blinding occurs when participants don't know if they are getting the real treatment or a placebo. There's no indication of stratification (grouping by characteristics), randomization (random assignment process details aren't given), or replication (repeating the experiment) in the description.

Answer:

B. blinding