Homework Answers
Sol:
90% confidence interval for mean test scores
xbar-z*sigma/sqrt(n),xbar+z*sigma/sqrt(n)
z crit for 90%=1.645
xbar=65
sigma=12
n=100
65-1.645*12/sqrt(100),65+1.645*12/sqrt(100)
63.026,66.974
ANSWER:
90% lower limit mean=63.0
90% upper limit mean=67.0
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