A coffee machine is supposed to dispense 12 ounces of coffee in each cup. An inspector selects a random
sample of 40 cups of coffee and finds they have an average amount of 12.2 ounces with a standard deviation of
0.3 ounce. Use a 99% confidence interval to test whether the machine is dispensing acceptable amounts of
coffee.

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The Answer of A coffee machine is supposed to dispense 12 ounces of coffee in each cup. An inspector selects a random
sample of 40 cups of coffee and finds they have an average amount of 12.2 ounces with a standard deviation of
0.3 ounce. Use a 99% confidence interval to test whether the machine is dispensing acceptable amounts of
coffee.

A Coffee Machine Is Supposed to Dispense 12 Ounces of Coffee