MATH 225 Week 6 Assignment; Confidence Interval for Mean Population Standard Deviation Known
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00 MATH225 Confidence Intervals for the Mean (Population Standard Deviation Known) 116840017831511684001082555 Population Point Estimate Mean = π Mean = π₯Μ Population Proportion = p Sample Proportion = πΜ Review Example: The average number of chips per bag from the potato chips available at a supermarket is unknown. A random sample of potato chip bags from the supermarket yields a sample man of 250.6 chips. Assume the sample distribution of the mean has a standard deviation of 18.9. Use the Empirical Rule to construct a 99.7% confidence interval for the true population mean number of potato chips. **The your confidence levelβ¦the your confidence interval. 1143000302026Example: Example: A random sample of registered voters were asked about an issue on the ballot of an upcoming election. The proportion of those surveyed who plan to vote βYesβ oh the issue is 0.54, with a margin of error of 0.06. Construct a confidence interval for the proportion of registered voters that plan to vote βYesβ on the issue. Most Common Confidence Intervalsβ Level of Confidence Zc 90% 1.645 95% 1.96 99% 2.575 What if we donβt have a common level of confidence? Example: Find the critical value zc necessary to form a confidence interval at the level of confidence shown below. c = 0.92b) c = 0.87 Example: In a random sample of 55 refrigerators, the mean repair cost wa
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