Question

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

Answer 1

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