SOLUTION: #1 You measure 28 textbooks' weights, and find they have a mean weight of 41 ounces. Assume the population standard deviation is 11.9 ounces. Based on this, construct a 99% confid

Question 1120223: #1
You measure 28 textbooks' weights, and find they have a mean weight of 41 ounces. Assume the population standard deviation is 11.9 ounces. Based on this, construct a 99% confidence interval for the true population mean textbook weight.
Give your answers as decimals, to two places
_____< μ < _____
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
The half-interval is z(0.995)*sigma/sqrt(n)
=2.576*11.9/sqrt(28)
=5.79
This is added and subtracted to the mean, so the interval is (35.21 oz, 46.79 oz.)
RELATED QUESTIONS
You measure 41 textbooks' weights, and find they have a mean weight of 49 ounces. Assume... (answered by robertb)

You measure 45 textbooks' weights, and find they have a mean weight of 40 ounces. Assume... (answered by oscargut)

You measure 47 textbooks' weights, and find they have a mean weight of 59 ounces. Assume... (answered by Boreal)

You measure 30 textbooks' weights, and find they have a mean weight of 78 ounces. Assume... (answered by math_tutor2020)

You measure 45 textbooks' weights and find they have a mean weight of 56 ounces. Assume... (answered by Boreal)

You measure 22 textbooks' weights, and find they have a mean weight of 73 ounces. Assume... (answered by ewatrrr)

You measure 42 randomly selected textbooks' weights, and find they have a mean weight of... (answered by Boreal)

You measure 49 textbooks' weights, and find they have a mean weight of 65 ounces. Assume... (answered by Boreal)

You measure 26 textbooks' weights, and find they have a mean weight of 44 ounces. Assume... (answered by Boreal)