<span>I would say its C) the fall of Communist states in Europe</span>
Researchers often use computers in their experiments to keep from influencing the participants and to keep themselves <u>blind</u> regarding the conditions to which the participants have been assigned.
<h3><u>Why is research blinding crucial?</u></h3>
Blinding is crucial to prevent bias (such as observer bias and demand characteristics) and guarantee the internal validity of a study.
Participants may alter their behavior in ways that affect the outcome that researchers are aiming to measure if they are aware of whether they are in a control or treatment group. If those providing the treatment are aware of the participants' assigned groups, they may treat them differently, which could either directly or indirectly affect the outcome.
Learn more about research blinding with the help of the given link:
brainly.com/question/3453118?referrer=searchResults
#SPJ4
Computation of intelligence quotient is mental age/chronological age (real age)*100.
Harvey is 8 years old (Chronological age)
4 years old (mental age)
=(4/8)*100
= 0.5*100
=50 intelligence quotient
Based on Binet's scale 70% and below belongs to the cluster of below normal IQ levels and Harvey is included in this cluster.
