The Ball Corporation's beverage can manufacturing plant in Fort Atkinson, Wisconsin, uses a metal supplier that provides metal with a known thickness standard deviation σ = .000959 mm. If a random sample of 58 sheets of metal resulted in an x-bar = 0.2731 mm, calculate the 99 percent confidence interval for the true mean metal thickness.
Answer to relevant QuestionsFind a confidence interval for assuming that each sample is from a normal population. a. x-bar = 24, s = 3, n = 7, 90 percent confidence b. x-bar = 42, s = 6, n = 18, 99 percent confidence c. x-bar = 119, s = 14, n = 28, 95 ...A random sample of 25 items is drawn from a population whose standard deviation is unknown. The sample mean is x-bar = 850 and the sample standard deviation is s = 15. Use Appendix D to find the values of Student's t. a. ...Should p be assumed normal? a. n = 25, π = .50 b. n = 60, π = 20 c. n = 100, π = .08 A sample of 50 homes in a subdivision revealed that 24 were ranch style (as opposed to colonial, tri-level, or Cape Cod). (a) Construct a 95 percent confidence interval for the true proportion of ranch style homes. (b) Check ...The EPA city/hwy mpg range for a Saturn Vue FWD automatic 5-speed transmission is 20 to 28 mpg. (a) Estimate using Method 3 from Table 8.11. (b) If you owned this vehicle, how large a sample (e.g., how many tanks of gas) ...
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