SOLUTION: You measure 45 textbooks' weights and find they have a mean weight of 56 ounces. Assume the population standard deviation is 6.6 ounces. Based on this, construct a 95% confidence i

Algebra ->  Probability-and-statistics -> SOLUTION: You measure 45 textbooks' weights and find they have a mean weight of 56 ounces. Assume the population standard deviation is 6.6 ounces. Based on this, construct a 95% confidence i      Log On


   

Question 1170284: You measure 45 textbooks' weights and find they have a mean weight of 56 ounces. Assume the population standard deviation is 6.6 ounces. Based on this, construct a 95% confidence interval for the true population mean textbook weight.
Give your answers as decimals, to two places
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
the half-interval is z*sigma/sqrt(n)
for 95% the z is 1.96
so half-interval is 1.96*6.6/sqrt(56)=1.93 oz.
(54.07, 57.93) oz