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A random survey of teachers found that 224 of 395 elementary school teachers and 126 of...

A random survey of teachers found that 224 of 395 elementary school teachers and 126 of 266 high schoolteachers were very satisfied with their work. Find a 95% confidence interval for the difference (elementary minus high school) in proportions of teachers who are very satisfied with their work.

Math   Statistics-And-Probability   
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Answer #1

n1=395

n2=266

x1=224

x2=126

95% confidence interval for proportion

Formula


Zc=1.96 ( using z-table )

95% confidence interval for proportion

95% confidence interval for proportion is

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