According to Keynote systems, Wal-Mart's Website was available 95% of the time during the most recent holiday shopping season.
Assuming this finding to be based on a simple random sample of 200 attempts, construct and interpret the 90% confidence interval for the population proportion of the time the Wal-Mart site was available during this period.
Additional Information
This questionlies from Statistics and it is about calculating the probability of Wal-Mart website's availability during shopping season with 90% confidence level.