Need help with these questions. Thanks!
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
proper
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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