SOLUTION: A supermarket wants to estimate the percentage of shoppers paying cash for their purchases. On a particular day 526 of the 950 shoppers who made purchases at the supermarket paid i

Question 1196345: A supermarket wants to estimate the percentage of shoppers paying cash for their purchases. On a particular day 526 of the 950 shoppers who made purchases at the supermarket paid in cash. Calculate a 90% confidence interval for the percentage of shoppers paying cash for their purchases.
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
90% half-interval is z(0.95)*sqrt(p91-p)/n)
p=526/950=0.554
so half-interval=1.645*sqrt(0.554*0.456)/950)
=0.027
the interval is 0.554+/-0.027 or (0.527, 0.581)
RELATED QUESTIONS
A random sample of 200 male shoppers in pavilion shopping mall were interviewed to... (answered by Boreal)

A sample of 200 customers at a supermarket showed that 28 used a debit card to pay for... (answered by ewatrrr)

the daily sales of a particular item at branch of Sue's supermarket are normally... (answered by ewatrrr,stanbon)

An experiment is conducted at a local supermarket, where shoppers are asked to taste two... (answered by ikleyn)

A mall wants to determine if staying open for one additional hour on weekdays would... (answered by Edwin McCravy)

at a shopping mall, 40% of the shoppers are willing to take a survey. estimate the... (answered by Boreal)

The entrace cover charge for a theme park is $ 1.25 for children and $2.75 for adults. On (answered by ankor@dixie-net.com)

Store gives a discount to 4 of every 10 shoppers. What percent of the shoppers would... (answered by nerdybill)

In 2005 shoppers spent $9 billion dollars on Father's Day gifts and $14 billion dollars... (answered by fractalier)