MATH 21 Worksheet #8 One-Sample Hypothesis Tests (Sections 10.2 10.4) Name _ Complete the following problems. This worksheet is due on and will count toward 30 inclass worksheet points. 1. A student is interested in the mean life span of males in his town. He has heard claims that the mean age at death for males in his town is 69 years, but suspects that it is less. He randomly selects 43 male deaths from the past year. The mean age at death far these 48 men was 67.5 years, with a standard deviation of 2.71 years. Test the student's claim at the 0.05 level of signicance. Step 5: There sufficient evidence to conclude that \f3. ATV commercial claimsthat the mean cost of a funeral today is above $8000 A survey of 233 funerals showed that they had a mean cost of $8150, with a standard deviation of 5379. Test the commercial's claim at the 0.01 level of signicance. Step 5: There sufficient evidence to conclude that 4. The piston diameter of a certain hand pump is 0.4 inch. The manager determines that the diameters are normally distributed, with a mean of 0.4 inch and a standard deviation of 0.004 inch. After recalibrating the production machine, the manager randomly selects 21 pistons and determines that the standard deviation is 0.0035 inch. Is there significant evidence for the manager to conclude that the standard deviation has decreased at the a = 0.01 level of significance? Step 5: There sufficient evidence to conclude that5. The author of a blackiack strategy book claims that the dealer wins more than 67% of all hands deallt A blackjack player played 100 hands against a computer dealer. and the computer dealer won 68 ofthe hands. Use these data to test the author's claim at the 0.01 level of signicance. Step 5: There sufficient evidence to conclude that