The Weights of Aluminum Castings Produced by a Process Are

question 64

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 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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Definitions:

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