Question

7:57 LTE X MATH216-Test # 4.docx 1. Researchers wanted to determine if carpeted rooms contained more bacteria than uncarpeted rooms. To determine the amount of bacteria in a room, researchers pumped the air from the room over a Petri dish at the rate of one cubic foot per minute for eight carpeted rooms and eight uncarpeted rooms. Colonies of bacteria were allowed to form in the 16 Petri dishes. The results are presented in the table below. The data seem to be normally distnibuted with no outiers. Do carpeted rooms have more bacteria than uncarpeted rooms at the 0.05 level of significance? 2. Nexium is a drug that can be used to reduce acid produced in the body and heal damage to the esophagus due to acid reflex. The manufacturer of Nexium claims that more then 94% of patients taking the medication are healed within 8 weeks. In clinical trials, 213 of 224 patients suffering from acid reflux disease were healed after 8 weeks. Test the manufacture's claim at the 01 level of significance. 3. Based on data from the National Health Survey, men aged from 25 to 34 have heights with a standard deviation of 2.9 inches. Test the claim that men in a higher age bracket -45 through 54-have heights with a different variability. The heights of 25 randomly selected men in the 45 to 54 age bracket are listed below. If you reject the null hypothesis, you want a risk of no more than five percent of being incorrect. 71.22 65.80 66.24 69.62 7049 7 0.00 71.46 65.72 68.10 72.14 71.58 66.85 69.88 68.69 72.7 67.34 68.40 68,96 68.70 72.69 68.67 67.79 63.97 67.19 a Open With Print

Answer 1