A spar retailer observed a random sample of 160 customers and found that 68 customers paid for their grocery purchased by cash. What's the required critical value to construct a 99%confidence interval...

A spar retailer observed a random sample of 160 customers and found that 68 customers paid for their grocery purchased by cash. What's the required critical value to construct a 99%confidence interval for the actual percentage of customers who pay cash for their grocery purchases