The Weights of Aluminum Castings Produced by a Process Are

Multiple Choice

The weights of aluminum castings produced by a process are normally distributed. A random sample of 5 castings is selected; the sample mean weight is 2.21 pounds; and the sample standard deviation is 0.12 pound. The 98% confidence interval for the population mean casting weight is _________.

A) 1.76 to 2.66
B) 2.00 to 2.41
C) 2.08 to 2.34
D) 1.93 to 2.49
E) 2.49 to 2.67