Question

The National Bank, like most other large banks, found that using automatic teller machines (ATMs) reduces the cost of routine bank transactions. National installed an ATM in the corporate offices of the Fun Toy Company. The ATM is for the exclusive use of Fun's 615 employees. After several months of operation, a sample of 100 employees revealed the following use of the ATM machine by Fun employees in a month:

Number of Times ATM Used	Frequency
0	20
1	30
2	20
3	5
4	5
5	20

a. What is the estimate of the proportion of employees who do not use the ATM in a month?

Proportion           20 20 Correct %

b-1. For estimate of the proportion of employees who do not use the ATM in a month, develop a 90% confidence interval. (Round the final answers to 3 decimal places.)

90% confidence interval is 0.134 0.134 Incorrect and 0.265 0.265 Incorrect .

b-2. Can National be sure that at least 40% of the employees of Fun Toy Company will use the ATM?

Yes Correct

c. How many transactions does the average Fun employee make per month? (Round the final answer to 2 decimal places.)

Total transactions           2.05 2.05 Correct

d. Develop a 90% confidence interval for the mean number of transactions per month. (Round the final answers to 3 decimal places.)

90% confidence interval for the mean number of transaction per month is 1.758 1.758 Incorrect and 2.342 2.342 Incorrect .

e. Is it possible that the population mean is 0?

No

Answer 1