Question

1- The accuracy of a potato chip bag filling machine was studied. A simple random sample...

1-

The accuracy of a potato chip bag filling machine was studied. A simple random sample of 12 bags had a sample mean fill weight of 8.12 oz. and a sample standard deviation of 0.1 oz. The distribution of the fill weights is assume NORMAL.

Find a 99% confidence interval LOWER LIMIT for the population mean fill weight.

Note: Enter X.XX AT LEAST ONE DIGIT BEFORE THE DECIMAL, TWO AFTER and round up. Thus, 27 is entered as 27.00, 3.5 is entered as 3.50, 0.3750 is entered as 0.38

2-

Assuming potato chip bag fill weights are normally distributed, consider a new random sample of n=5 fill weights. Do NOT use any prior mean and standard deviation assumptions. The new study fill weight data values are:

7.5 8.1 9.2 7.8 8.4

Calculate a 95% Confidence Interval UPPER LIMIT for the population mean fill weight.

Note: Enter X.XX AT LEAST ONE DIGIT BEFORE THE DECIMAL, TWO AFTER and round up. Thus, 27 is entered as 27.00, 3.5 is entered as 3.50, 0.3750 is entered as 0.38

3-

Assuming potato chip bag fill weights are normally distributed, consider a new random sample of n=5 fill weights. Do NOT use any prior mean and standard deviation assumptions. The new study fill weight data values are:

7.5 8.1 9.2 7.8 8.4

What is the critical value for a 99% confidence interval?

Note: Enter X.XX AT LEAST ONE DIGIT BEFORE THE DECIMAL, TWO AFTER and round up. Thus, 27 is entered as 27.00, 3.5 is entered as 3.50, 0.3750 is entered as 0.38

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Answer #1

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