6th December 2019

dummies
13

What is the critical value for a 90 confidence interval?

Statistics For Dummies, 2nd Edition
Confidence Levelz*– value
90%1.64
95%1.96
98%2.33
99%2.58

Moreover, what is the alpha value for a 90 confidence interval?

Area in Tails
Confidence LevelArea between 0 and z-scoreArea in one tail (alpha/2)
90%0.45000.0500
95%0.47500.0250
98%0.49000.0100
99%0.49500.0050

What is the meaning of 95% confidence interval?

If repeated samples were taken and the 95% confidence interval was computed for each sample, 95% of the intervals would contain the population mean. A 95% confidence interval has a 0.95 probability of containing the population mean. 95% of the population distribution is contained in the confidence interval.
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