Question

A random sample of 1200 car owners in a particular city found 384 car owners who received a speeding ticket this year. Find a 95% confidence interval for the true percent of car owners in this city who received a speeding ticket this year. Express your results to the nearest hundredth of a percent.

Answer: ___________to ___________%

Answer 1

Given that, n = 1200 and x = 384

=> sample proportion = 384/1200 = 0.32

A 95% confidence level has significance level of 0.05 and critical value is,

The 95% confidence interval for the population proportion is,

Answer : 29.36 to 34.64 %