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Construct Confidence Interval For Population Mean. Refer to the above table. At the end of the program the students are given a standardized reading test. σ x σ n 9 36 15. Please enter the necessary parameter values and.
A confidence interval for a mean gives us a range of plausible values for the population mean. Calculate the 95 confidence interval for the population mean. This calculator will compute the 99 95 and 90 confidence intervals for the mean of a normal population given the sample mean the sample size and the sample standard deviation. A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. How do you construct a 90 confidence interval for the population mean μ. However we can compute confidence intervals for the population mean.
We are 95 confidence that the true mean is between 4465 and 5935.
For 95 confidence interval z α2 196. The motivation for creating a confidence interval for a mean. X-z σ n where z is from the standard distribution tables in the reference and is 196 for a CI of 95. To calculate a CI for the population mean average under these conditions do the following. Refer to the above table. The sample mean standard deviation sample size Descriptive statistics needed.