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how to find the sample mean with confidence interval. You can find the upper and lower bounds of the confidence interval by adding and subtracting the margin of error from the mean. Find a 90 confidence interval for ยต the average annual prot per employee for retail sales.
In This Lesson Students Will Calculate The Minimum Sample Size Needed To Estimate The Mean Construct A Confi Confidence Interval Student Guide Guided Notes from www.pinterest.com
For example the population mean m is found using the sample mean x. Use the confidence level and sample data to find a confidence interval for estimating the population m. Confidence level 1 a.
Each apple is a green dot our observations are marked purple.
Now the true mean might not be inside the confidence interval but in 95 of the cases it will be. Confidence Interval x z o n to x z o n. We use the following formula to calculate a confidence interval for a difference in population means. A group of 56 randomly selected students have a mean score of 308 with a standard deviation.
