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Question 974874: Determine the level of the confidence given the confidencecoefficient z(α/2) for the situation:Determine the level of the confidence given the ... 

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(a) Determine the level of confidence given the confidence coefficient z(á/2) for . ... .. the confidence coefficient z(α/2) for the following situation: z(α/2) = 1.96 

Margin of Error Formula  Statistics  About.com
A 95% level of confidence has α = 0.05 and critical value of zα/2 = 1.96. ... In order to keep the margin of error at a given value while increasing our confidencelevel will require us to ... How to Calculate a Confidence Interval for a Mean. 
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Confidence Interval  Vitutor
Confidence interval, confidence level, significance level, critical values table and definitions. ... A critical value is the value corresponding to a given significance level. 1 − α, α/2, zα/2. 0.90, 0.05, 1.645. 0.95, 0.025, 1.96. 0.99, 0.005, 2.575 ... 

Confidence Interval for a Population Mean  Kean University
so that 95% of the values are in the interval, mu + 2 sigma xbar . Since mu ... is given by: confidence ... The proper z score depends on the value of alpha ... is called the confidence coefficient or confidence level and the interval, interval estimate for mu ... In most real life situations the variance of the population is unknown... 

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How Big a Sample Do I Need?  BrownMath.com
E equals z of alpha over 2, times sigma over square root of n ... Solution: Note first that this is not a realistic situation. ... Answer: Given a population standard deviation of 6.2 units per hour, if you have a sample ... Student's t is more spread out than z, so the confidence intervals are a bit wider, so you h... 