The standard deviation of the population of elementary school math-
achievement scores is 7.78. A random sample of 20 elementary school children
was selected and yielded a mean achievement score of 80.04.
a. Calculate the standard error of the mean.
b. Use the z test to establish whether this sample could be representative of
the general population of elementary school children whose mean math
achievement score is known to be 78.00.
a SEm=1.74
Psychology
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Answer the following statement true (T) or false (F)
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