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 kilograms; and the sample standard deviation is 0.12 kilograms.The 98% confidence interval for the population mean casting weight is ___.
A)1.76 to 2.66
B)2.01 to 2.41
C)2.08 to 2.34
D)1.93 to 2.49
E)2.49 to 2.67

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The Answer of 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 kilograms; and the sample standard deviation is 0.12 kilograms.The 98% confidence interval for the population mean casting weight is ___.
A)1.76 to 2.66
B)2.01 to 2.41
C)2.08 to 2.34
D)1.93 to 2.49
E)2.49 to 2.67

The Weights of Aluminum Castings Produced by a Process Are