Discussion:
Q: Procyon Mfg. produces tennis balls. Weights are supposed to be normally distributed with a mean of 2.035 ounces and a standard deviation of 0.002 ounces. A sample of 25 tennis balls shows a mean weight of 2.036 ounces. Atα = .025 in a right-tailed test, is the mean weight heavier than it is supposed to be?