Statistics questions

Statistics
Tutor: None Selected Time limit: 1 Day

405 tenth graders 349 can read above 8th grade level p=0.138. Construct the 90% confidence interval for population proportion of 10th graders at or below 8th grade readings even lower bound and higher bound round to 3 decimal places

Mar 4th, 2015

estimate = 56/405 = 0.138

p=0.138

(1-p) =0.862

standard error = sqrt(p*(1-p)/n) = sqrt(0.138*0.862/405) =0.0171

Tabular value for 90% is 1.645

90% Confidence interval = 0.138-1.645*0.0171, 0.138+1.645*0.0171

0.138-0.028 ,0.139+0.028 

0.110, 0.166

Mar 4th, 2015

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