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[DOC File]Confidence Intervals – 2 sample Means
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Confidence Intervals – 2 sample Means Name_____ 1. A group of 12 companies in the insurance industry has a mean annual profit as percent of revenue of 4.4 with a standard deviation of 1.6 while the mean annual profit as a percent of revenue for a group of 10 health care companies was 4.6 with a standard deviation of 1.4.
confidence interval unknown standard deviation

[DOC File]Los Angeles Mission College
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The 99% confidence interval is larger because the confidence level is larger. ... The average hemoglobin reading for a sample of 20 teachers was 16 grams per 100 milliliters, with a sample standard deviation of 2 grams. Find the 99% confidence interval of the true mean. n=20 C.I. 99% =2.861
confidence interval standard deviation calculator

[DOC File]AP Stats Chapter 10: Estimating with Confidence
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Confidence Interval for a Population Mean (sigma known) Choose an SRS of size n from a population having unknown mean and known standard deviation. A level C confidence interval for is. Here z* is the value that determines the area C between –z* and z* under the standard Normal curve.
confidence interval calculator

[DOC File]Class notes - San Diego Mesa College
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confidence interval (or interval estimate) is a range (or an interval) of values used to estimate the true value of a population parameter. A confidence interval is sometimes abbreviated as CI. Example 1: Suppose that the mean for the current gas prices in $3.00 with the standard deviation $0.25.
confidence interval for the population standard deviation

[DOC File]Confidence Intervals
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the sample mean is 521, sample standard deviation is 28. Determine a confidence interval of 95%. In the group of 345 children surveyed, the sample mean was 11.3 and the standard deviation was 1.8. Find the 99% confidence interval for this data. Determine a confidence level of 95% using the following information: Sample mean = 2.6 Standard ...
confidence level and standard deviation

[DOCX File]Purdue University - Department of Statistics
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Assume that the standard deviation is known to be $220. Find a 99% confidence interval for the mean monthly rent for unfurnished one-bedroom apartments available for rent in this community. ̅ x - z * s n , ̅ x + z * s n = 1400 -2.576 220 32 , 1400 +2.576 220 32 =(1299.817, 1500.183) Does the confidence interval give us information about the ...
standard deviation for 90% confidence

[DOC File]Confidence Interval for a Population Mean
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A physician wanted to estimate the mean length of time that a patient had to wait to see him after arriving at the office. A random sample of 36 patients showed a mean waiting time of 23.4 minutes and a standard deviation of 7.2 minutes. Find a 96% confidence interval for . 2.
confidence interval chart

[DOC File]Confidence Interval Worksheet (6
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99% versus 95% confidence interval. Find a 99% confidence interval for the mean weight µ of the population of male runners in #2 (with n=24). Is the 99% confidence interval wider or narrower than the 95% interval found in Exercise 6.12? Explain in plain language why this is true.
95% confidence level standard deviation

99 confidence interval standard deviation