Suppose a sample of 2339 tenth graders is drawn. Of the students sampled, 1942 read above...

Suppose a sample of 2339 tenth graders is drawn. Of the students sampled, 1942 read above the eighth grade level. Using the data, construct the 99% confidence interval for the population proportion of tenth graders reading at or below the eighth grade level. Round your answers to three decimal places.

Expert Solution

We have given,

x=2339-1942=397
n=2339
Estimate for sample proportion=   0.1697
Level of significance is =1-0.99=0.01
Z critical value(using Z table)=2.576

Confidence interval formula is

=(0.1497,0.1897
Lower limit for confidence interval=0.150

Upper limit for confidence interval=0.190

orchestra answered 2 years ago

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