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Q: What are the two ways to shorten a confidence interval?
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What is the Z value for 67 percent confidence interval estimation?

The answer will depend on whether the interval is one-sided or two-sided; and if two-sided, whether it is symmetrical.For a symmetrical two-sided confidence interval, the Z value is 0.974114The answer will depend on whether the interval is one-sided or two-sided; and if two-sided, whether it is symmetrical.For a symmetrical two-sided confidence interval, the Z value is 0.974114The answer will depend on whether the interval is one-sided or two-sided; and if two-sided, whether it is symmetrical.For a symmetrical two-sided confidence interval, the Z value is 0.974114The answer will depend on whether the interval is one-sided or two-sided; and if two-sided, whether it is symmetrical.For a symmetrical two-sided confidence interval, the Z value is 0.974114


What is z value for 90 percent confidence interval?

For a two-tailed interval, they are -1.645 to 1.645


What is the Z score for a confidence level of 0.01?

The answer depends on whether the confidence interval is one sided or two sided.


What is the critical value of z for an 88 percent confidence interval?

The two tailed critical value is ±1.55


What z value is associated with the 99 percent confidence interval?

2.326 (one sided) or 2.578 (two sided)


What is z value for 90 percent confidence interval estimation?

The answer will depend on whether the interval in one or two sided. One-sided: Z < 1.28 or Z > -1.28 Two-sided: -1.64 < Z < 1.64


What is the critical z value that corresponds to a confidence level of 92 percent?

It depends on whether the interval is one sided or two sided. The critical value for a 2-sided interval is 1.75


What is the formula for obtaining confidence interval for rate ratio of two age adjusted rates?

95% confidence interval for rate can be expressed as : Rate +/- 1.96 Rate/sqrt(n) where n is the number of events and sqrt means square root. Hope this helps. Omar.


What is asymmetrical confidence interval?

A confidence interval, for a given probability, is the interval within which the true value may be found with that probability if the null hypothesis is true. There are two possible reasons why a confidence interval may be asymmetrical. One is that the alternative hypothesis is asymmetrical: for example, H0 is X = 5 and H1 is X > 5 (rather than X ≠ 5). The other possible reason is that the test statistic has an asymmetrical distribution. Either of these can give rise to asymmetrical CIs.


What Z value corresponds to a confidence level of 98 percent?

The answer depends on whether the interval is one-sided or two-sided and, if two-sided, whether or not it is symmetrical.


What is the Z value for 90 percent confidence interval estimation?

The answer depends on whether the test is one-tailed or two-tailed.One-tailed: z = 1.28 Two-tailed: z = 1.64


What is z value for 76 percent ci?

The answer will depend on whether the confidence interval is one-sided, or two-sided and, if two-sided, whether or not it is symmetrical. Symmetrical 2-sided: ±0.189