Data Analysis

Contains 3  Questions

(Attempt=2/3)

1)  We are evaluating the sheet metal scrap rate in a contractor proposal. Based on a sample of 24 parts you calculate a mean rate of 6.50% (treat as 6.50) and a standard deviation of 1.20. Calculate a 80% confidence interval to be used to support negotiations. (Carry intermediate calculations to three decimal places.)
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  [removed] 6.18 ≤ μ ≤ 6.82

  [removed] 6.41≤ μ ≤ 6.59

  [removed] 6.08≤ μ ≤ 6.92

  [removed] 6.43≤ μ ≤ 6.57

2)  Your organization has a goal of 14 days for the average processing of a purchase request (PR) from notification to final approval. They are only concerned if it takes longer than 14 days. A sample of 25 PRs produced a mean of 15.5 days and a standard deviation of 1.5 days. Test at the 10% level of significance whether they are meeting their goal. Select the correct answer out of each pair of choices. (Carry intermediate calculations to three decimal places.)
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  [removed] The tp is 1.711

  [removed] The tp is 1.318

  [removed] The tc is 5.00

  [removed] The tc is 25.00

  [removed] We would REJECT the null hypothesis

  [removed] We would FAIL TO REJECT the null hypothesis

  [removed] We would conclude that the organization IS meeting their goal.

  [removed] We would conclude that the organization IS NOT meeting their goal

3)  We are estimating the spares requirement for a radar power supply. The power supply was designed with a mean (μ) life of 6500 hours. The standard deviation (σ) determined from testing is 750 hours. What is the likelihood that a power supply would fail between 7225 and 7670 hours?
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  [removed] .0444 or 4.44%

  [removed] .3340 or 33.40%

  [removed] .1066 or 10.66%

  [removed] .4406 or 44.06%