In constructing a 75% confidence interval, if the sample size is 12 and the valu

Question

In constructing a 75% confidence interval, if the sample size is 12 and the value of the population standard deviation is 32.6, then the table value of the appropriate confidence multiplier is...

A. 1.363

B. 0.670

C. 1.150

D. Not in the table


In constructing a 98% confidence interval, if the sample size is 25, and the value of the sample standard deviation is 18.2, then the table value of the appropriate confidence multiplier is

2.492

2.326  

2.485         

not in the table

2.492

2.326  

2.485         

not in the table

Explanation / Answer

Sample Size = (Z-score) * StdDev*(1-StdDev) / (margin of error)

12 = (Z- Score) * .326 * ( 1-.326)/0.25

Z- Score = 12 *.25 /.326 * .674 = 1.363

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