The National Bank, like most other large banks, found that usingautomatic teller machines (ATMs) reduces the cost of routine banktransactions. National installed an ATM in the corporate offices ofthe Fun Toy Company. The ATM is for the exclusive use of Fun's 595employees. After several months of operation, a sample of 100employees revealed the following use of the ATM machine by Funemployees in a month:
Number of Times
ATM Used | Frequency |
| 0 | 15 |
| 1 | 20 |
| 2 | 10 |
| 3 | 15 |
| 4 | 15 |
| 5 | 25 |
|
a. What is the estimate of the proportion ofemployees who do not use the ATM in a month?
Proportion %:
b-1. For estimate of the proportion ofemployees who do not use the ATM in a month, develop a 80%confidence interval. (Round the final answers to 3 decimalplaces.)
80% confidence interval is _____and ______ .
b-2. Can National be sure that at least 40% ofthe employees of Fun Toy Company will use the ATM?
Yes or No?
c. How many transactions does the average Funemployee make per month? (Round the final answer to 2decimal places.)
Total transactions ___________
d. Develop a 80% confidence interval for themean number of transactions per month. (Round the finalanswers to 3 decimal places.)
80% confidence interval for the mean number of transaction permonth is ____ and ______ .
e. Is it possible that the population mean is0?
Yes or No?
