Woolworths Finansiële Dienste wil die proporsie kredietkaarthouers wat ʼn kredietsaldo aan die einde van die maand het, en dus rente koste aangaan, beraam. Aanvaar dat die vereiste beramingsfout ±0.03 is by ʼn 98% vertrouenspeil. Hoe groot steekproef moet geselekteer word indien daar verwag word dat 70% van die kaarthouers ʼn kredietsaldo aan die einde van die maand het? / Woolworths Financial Services wants to estimate the proportion of credit card holders who carry a credit balance at the end of the month and incur an interest charge. Assume that the desired margin of error is ±0.03 at a 98% level of confidence. How large a sample should be selected if it is anticipated that 70% of the card holders carry a credit balance at the end of the month?