Suppose a retailer claims that the average wait time for a customer on its support line is 179 seconds. A random sample of 52 customers had an average wait time of 170 seconds. Assume the population standard deviation for wait time is 48 seconds. Using a 95% confidence interval, does this sample support the retailer's claim?
Using a 95% confidence interval, does this sample support the retailer's claim? Select the correct choice below, and fill in the answer boxes to complete your choice. (Round to two decimal places as needed.)
A. No, because the retailer's claim is not between the lower limit of seconds and the upper limit of seconds for the mean wait time.
B. Yes, because the retailer's claim is between the lower limit of seconds and the upper limit of seconds for the mean wait time.
n= 52, = 170, = 48, c= 95%
formula for confidence interval is
calculate z critical value for c= 95%
using normal z table we get
critical value = 1.96
156.954 < μ < 183.046
confidence interval is = ( 156.95 , 183.05 )
B. Yes, because the retailer's claim is between the lower limit of seconds and the upper limit of seconds for the mean wait time.
Get Answers For Free
Most questions answered within 1 hours.