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- How do you present a 90 confidence interval?
- What is the standard deviation for 90 confidence interval?
- What does a 90 confidence interval tell us?
How do you present a 90 confidence interval?
For a 95% confidence interval, we use z=1.96, while for a 90% confidence interval, for example, we use z=1.64.
What is the standard deviation for 90 confidence interval?
The standard deviation for each group is obtained by dividing the length of the confidence interval by 3.92, and then multiplying by the square root of the sample size: For 90% confidence intervals 3.92 should be replaced by 3.29, and for 99% confidence intervals it should be replaced by 5.15.
What does a 90 confidence interval tell us?
With a 95 percent confidence interval, you have a 5 percent chance of being wrong. With a 90 percent confidence interval, you have a 10 percent chance of being wrong. A 99 percent confidence interval would be wider than a 95 percent confidence interval (for example, plus or minus 4.5 percent instead of 3.5 percent).
