600 / 762
600
Chapter 13: Confidence Intervals – Small Samples
Example 13-7:
A project was assigned to ten male and ten female students
in a graduate class. The time (in days) it took to independently complete the
project by the students were recorded. The instructor for the course feels
that the male and female students, on average, will spend the same amount
of time to complete the project.
The number of days to complete the project by all the male and female
students is given in
Table 13-3
.
Table 13-3:
Time to Complete the Project
Construct a 98% confidence interval for the difference (male – female) in
the mean time for completion of the project. Assume that the populations of
completion times for the male and female students are normally distributed
and that the population variances are equal.
Solution:
Again, we can use the
Small Sample Confidence Intervals for
the Difference between Two Independent Means
workbook to help with
the computations.
Figure 13-11
shows the workbook output for the
problem.
Click here for the Small Sample Confidence Interval for the Difference Between Two Independent Means Workbook