Use the following information to answer question. A pharmaceutical company claims that it's product will regrow hair at the rate of 1 inch per month. Independent researchers want to conduct an experiment to determine if hair growth is less than what is advertised. They conduct a study at the a = .05 level with 100 men and find that the average hair regrowth is 8 inches per month, with a sample std dev of 3. The critical value is -1.64. What is the test statistic or obtained value