A large body of literature on the effect of
peer pressure has shown that the mean influence score for a scale of peer
pressure is 520 with a standard deviation of 80. An investigator would like to
show that a minor change in conditions will produce scores with a mean of only
500, and he plans to run a t test to compare his sample mean with a population
mean of 520.
a. What is the effect size in question?
b. What is the value of d if the size of
his sample is 100?
c. What is the power of the test?
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