It is said that happy and healthy workers are efficient and productive. A company that manufactures exercising machines wanted to know the percentage of large companies that provide on-site health club facilities. A sample of 240 such companies showed that 96 of them provide such facilities on site.

Construct a 95% confidence interval for the percentage of all such companies that provide such facilities on site. What is the margin of error for this estimate?

Confidence interval: __% to __%

Margin of error: __%