STATISTICAL TECHNIQUES AND TOOLS
TESTS OF SIGNIFICANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What is the critical value for a 95% confidence interval for proportions?
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z = 1.645
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z = 1.96
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z =-1.645
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z =-1.96
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Explanation:
Detailed explanation-1: -The critical value for a 95% confidence interval is 1.96, where (1-0.95)/2 = 0.025.
Detailed explanation-2: -The value of 1.96 is based on the fact that 95% of the area of a normal distribution is within 1.96 standard deviations of the mean; 12 is the standard error of the mean.
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