Question

CHAPTER NINE: One-Population Hypothesis Testing:

Perform the five-step hypothesis testing approach for the following problem below, including an appropriate diagram as illustrated in class.

The mean time using the present technology that Donald Co. uses to make widgets takes 12 minutes a widget.  Donald Co. is experimenting with a new method, and conducted a sample by making 30 widgets with the new method.  The sample using the new method obtained a mean of 11.2 minutes per widget, with a sample standard deviation of 3.8 minutes.  At the 0.01 significance level, can we conclude that the mean time using the new method is less than 12 minutes?

Please include an appropriate diagram as well as the 5 steps.

Answer 1