In: Statistics and Probability
Internet service: An Internet service provider sampled 530 customers, and finds that 70 of them experienced an interruption in high-speed service during the previous month.
(b) Construct a 90% confidence interval for the proportion of all customers who experienced an interruption. Round the answers to at least three decimal places.
We have given here,
x=70
n=530
Estimate for sample proportion
Level of significance is =1-0.90=0.1
Z critical value(using Z table)=1.645