A local retailer wants to know the proportion of customers who use a credit card. A random sample of 142 receipts showed that 83 used a credit card.
what are the 95% and 99% confidence limits?
2006-07-04 23:20:39 · 2 answers · asked by duuh 4 in Education & Reference ➔ Other - Education
ummm the statical confidence limit of 95%
and confidence limit of 99%
2006-07-04 23:59:05 · update #1
I think that's close...
n=142
the sample proportion is .58 so
z*=1.96 for a cofidence level of 95%
.58+or - 1.96 *square root of .58(1-.58)/142 =
.58+or- .081
2006-07-06 13:52:40 · answer #1 · answered by double v 5 · 0⤊ 0⤋
wat do those percentages mean, the 95 & 99 % ???
(83/142)*100 will give you the percentage of people who used the credit card...
if you need to know what is 95 & 99 % of 142.....:
(142*95)/100 & (142*99)/100
2006-07-04 23:40:01 · answer #2 · answered by Blind Wing 3 · 0⤊ 0⤋