Suppose in 2011 a survey of 1172 workers in the city of Calgary found that 211 used public transport to commute to work. Give your answers to the following to two decimal places.
Part (a) Estimate the percentage of workers in Calgary who use public transport to commute to work.
Part (b) Find a 95% confidence interval for the percentage of workers in Calgary using public transport to commute to work. Use the sample proportion in your estimate of the standard error. Provide the lower and upper bounds for your confidence interval.