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how do you find the sample mean of a confidence interval. Assuming the following with a confidence level of 95. The number of observations n.
Statistics 101 Confidence Intervals Population Deviation Known Confidence Interval Statistics Math Statistics Notes from www.pinterest.com
Look in the last row where the confidence levels are located and find the confidence level of 95. In our example lets say the researchers have elected to use a confidence interval of 95 percent. So our 99 confidence interval is 1116 1724.
You can find the upper and lower bounds of the confidence interval by adding and subtracting the margin of error from the mean.
The formula for confidence interval can be calculated by subtracting and adding the margin of error from and to the sample mean. The lower end of the interval is 75 045 705 inches. Now if we use 0 as the test value these differences will be exactly equal to our sample means. Not only will we see how to conduct a hypothesis test about the difference of two population means we will also construct a confidence interval for this difference.
