1. The following data set represents the repair costs (in dollars) for a random sample of 30 dishwashers. (Adapted from Consumer Reports) 5. In a survey of 2000 adults from the U.S. age 65 and over, 1320 received a flu shot. (Adapted from The Centers for Disease Control and Prevention) 6. Refer to the data set in Exercise 1. Assume the population of dishwasher repair costs is normally distributed 32. In Exercises 29″�34, consider each claim. If a hypothesis test is performed, how should you interpret a decision that (a) rejects the null hypothesis? (b) fails to reject the null hypothesis? 37. A refrigerator manufacturer claims that the mean life of its refrigerators is about 15 years. You are asked to test this claim. How would you write the null hypothesis if 33. A tea drinker’s society estimates that the mean consumption of tea by a person in the U.S. is more than 7 gallons per year. In a sample of 100 people, you find that the mean consumption of tea is 7.8 gallons per year with a standard deviation of 2.67 gallons. At α=0.07, can you support the society’s claim? 35. The number of years it took a random sample of 32 former smokers to quit permanently is listed. At α = 0.05 test the claim that the mean time it takes smokers to quit smoking permanently is 15 years. (Adapted from The Gallup Organization) 42. A weight loss program claims that program participants have a mean weight loss of at least 10 pounds after one month. You work for a medical association and are asked to test this claim. A random sample of 30 program participants and their weight losses (in pounds) after one month is listed below. At α = 0.03, do you have enough evidence to reject the program’s claim?
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