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Study Resources (Statistics)

1. A telephone company's records indicate that private customers pay on average $17.10 per month for long-distance telephone calls. A random sample of 10 customers' bills during a given month produced a sample mean of $22.10 expended for long-distance calls and a sample variance of 45. A 5% significance test.
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1. A small town has 5600 residents. The residents in the town were asked whether or not they favored building a new bridge across the river. You are given the following information on the residents' responses, broken down by gender:                                         Men          Women          Total .
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1. A study is conducted to estimate survival in patients following kidney transplant. Key factors that adversely affect success of the transplant include advanced age and diabetes. This study involves 25 participants who are 65 years of age and older and all have diabetes. Following transplant, each participant is followed.
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1. An epidemiology instructor decides to evaluate different teaching methods by splitting the class into two groups. Each group will receive the same information but presented in different ways. Students are permitted to select which group they participate in. Results show students participating in a self-taught approach scored better than.
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1. A textile fiber manufacturer is investigating a new drapery yarn, which the company claims has a population mean thread elongation of 12 kilograms with a population standard deviation of 0.5 kilograms (Assume a normal distribution). The company wishes to test the hypothesis H H 12 against Hi: <12 using.
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