Cоnduct а Test оf Hypоthesis аbout а Population Mean According to Consumer Reports, the average cost of a basic dental tooth filling in the United States is $141. The consumer researcher believes that such a procedure is less expensive now and wants to conduct a hypothesis test to confirm the belief. An analysis of the data has shown that the standard deviation is $30. The value of alpha is set at .05. State the null hypothesis and the alternate hypotheses. What is alpha? What does it mean? Find the critical value. Conduct your test: A study is conducted with a random sample of 32 recent tooth fillings from across the United States. The data indicates that the average cost of a basic dental tooth filling is now $133.13. What is your test statistic? Take action and make a business decision. What if you are incorrect in your findings?