# [Solution]An Omaha electronics firm has received a shipment of

Chapter 9 Homework1. Bostonâs welfare department has stated that the average annual per capita income for aparticularly depressed section of the city is \$4,800, and…

Chapter 9 Homework1. Bostonâs welfare department has stated that the average annual per capita income for aparticularly depressed section of the city is \$4,800, and the population standard deviation is\$900. A citizenâs group has sampled 40 families from that section and found the average percapita income to be \$4,500. At a 5% level of significance, would you accept or reject the welfaredepartmentâs figures? a. What type of hypothesis test is this (two-tailed, lower or upper tail)?State null and alternative hypotheses.b. Use the level of significance (ɑ) to determine the âcritical valueâ (cut-off point), draw on adistributionc. What does the level of significance mean in this problem?d. Compute the test statistice. Make a decision: Accept or Reject Hof. Interpret your decision2. An Omaha electronics firm has received a shipment of 200 special components designed tomaintain a constant power output, 64 watts, with a standard deviation of 4 watts. A sample of 36of these components produced an average of 64.8 watts. The firm in interested in knowing, atthe .02 significance level, if the manufacturerâs claim of 64 watts is true. a. What type ofhypothesis test is this (two-tailed, lower or upper tail)? State null and alternative hypotheses.b. Use the level of significance (ɑ) to determine the âcritical valueâ (cut-off point), draw on adistributionc. What does the level of significance mean in this problem?d. Compute the test statistice. Make a decision: Accept or Reject Hof. Interpret your decision3. For the domestic airline industry the amount of time each plane must spend in maintenance isa critical factor. The records show that for a sample of 49 planes, Central Airways averagedowntime is 12 hours. The industry average is 11 hours, and the standard deviation is 3.5 hours.At a significance level of .10, should the company conclude that its downtime differssignificantly from the industry average? a. What type of hypothesis test is this (two-tailed, loweror upper tail)? State null and alternative hypotheses.b. Use the level of significance (ɑ) to determine the âcritical valueâ (cut-off point), draw on adistributionc. What does the level of significance mean in this problem?d. Compute the test statistice. Make a decision: Accept or Reject Hof. Interpret your decision

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