QNT 275
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- 1- An employer replaced its former paycheck system with
a paperless system that directly deposits payments into
employee checking or savings accounts. To verify that
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Order Paper Nowproper deductions have been made, employees can
check their pay stubs online. To investigate whether
employees prefer the new system, the employer distributed
an email questionnaire that asked
Do you think that the former payroll system is not
inferior to the new paperless system?
For the CLASS:
Do you think that this question could be improved?
If not, why not?
If so, how?
Explain your answer.
- 2- Executives of a cellular telephone company believe that 75% of iPhone users
are “very satisfied” with the device. If that’s the case, would you be surprised
if 85% of those in a survey of 225 customers say they are very satisfied?
Why or why not?
- 3- Under what conditions would you use a t-test as opposed to a z-test? Can you use the t-table to determine the critical value of the z-test? Explain why. What are the differences between a one-tailed and a two-tailed test?
- 4- Executives of a cellular telephone company believe that 75% of iPhone users
are “very satisfied” with the device. If that’s the case, would you be surprised
if 85% of those in a survey of 225 customers say they are very satisfied?
Why or why not?
- 5- Managers in the human resources department suspect
that sick-day absentee rates are higher on some
weekdays than others. What test can they use to
investigate this claim?
Why do you consider that test best?
Could an alternate test be used?
Why or why not?
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