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The Ajax Company just bought a new machine that makes boots. In a random sample of...

The Ajax Company just bought a new machine that makes boots. In a random sample of forty boots produced by the new machine, they find that the mean weight is 1520 grams with a standard deviation of 210 grams. Their old machine produced boots with a true mean weight of 1450 grams.
a. Find a 95% confidence interval for the true mean weight using the new machine.
b. Interpret the confidence interval in context.
c. Find the error bound of the above interval.
d. Is there evidence that the true mean weight for the new machine is different than that of the old machine? Justify!

Math   Statistics-And-Probability   
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