A random sample of 50 four-year-olds attending day care centers provided a yearly tuition average of $3987 and the population standard deviation of $630. Find the 90% confidence interval of the true mean.

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anonymous · Answer

http://www.algebra.com/algebra/homework/Probability-and-statistics/Probability-and-statistics.faq.question.135301.html

anonymous · Answer

try that link. im pretty sure the answer is there :P

anonymous · Answer

Thanks so much. :) Im not the best at math and im really suffering with statistics.

anonymous · Answer

Any time :)

anonymous · Answer

heres the answer to you other problem u posted

anonymous · Answer

[x=-4+/- sqrt0/4]


a=2 b=4 c=2

-b+/-sqrtb2-4ac

-4+/-sqrt4^2-4(2)(2)/2(2)= -4+/-sqrt16-16/4= [-4+/-(0/4)]