Mathematics, 15.04.2020 15:49 grantjaylynn
A random sample of 45 door-to-door salespersons were asked how long on average they were able to talk to the potential customer. Their answers revealed a mean of 8.5 minutes with a variance of 9 minutes. Which Excel statements will construct a 95% confidence interval for the time it takes a salesperson to talk to a potential customer.
a.
=8.5+1.96*9/SQRT(45), and =8.5-1.96*9/SQRT(45)
b.
=8.5+1.96*3/SQRT(45), and =8.5-1.96*3/SQRT(45)
c.
=45+1.96*3/SQRT(9), and =45-1.96*3/SQRT(9)
d.
=45+0.95*3/SQRT(9), and =45-0.95*3/SQRT(9)
e.
None of the above.
A random sample of 45 door-to-door salespersons were asked how long on average they were able to talk to the potential customer. Their answers revealed a mean of 8.5 minutes with a variance of 9 minutes. What is the point estimate for the average conversation length?
a.
45 salespersons
b.
9 minutes
c.
8.5 minutes
d.
5 minutes
e.
None of the above.
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