. A manufacturer of college textbooks is interested in the strength of the bindings produced by a particular binding machine. Strength can be measured by recording the force required to pull the pages from the binding. Assume the population standard deviation is 0.4 pounds. Suppose a random sample of 80 bindings yields a sample mean of 4 pounds. Find a 96% confidence interval for the population mean force in pounds needed to pull the pages from the binding. Make sure to state and check all conditions and interpret your interval in context.

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