Homework Assigned: Using the six step process and Minitab program
complete the test for independence:
Problem Definition: People of differing ages turn to a variety of media to get their
news. A study indicated the various age groups receive their news from the media
news source instead of media
groups shown in the following contingency table.
Medium
Local TV
National TV
Radio
Local Newspaper
Internet
Under 36 years of 36-50 years of age
age
107
73
75
52
95
1
2
3
4
5
Set up your spreadsheet as shown below and do not enter row or column totals (do not include
in report). Set alpha at .05
C1-T
Media
Local TV
National TV
20 Points
Radio
Local Newspaper
Internet
119
102
C2
Under 36
107
73
75
52
95
97
79
83
C3
36-50
Above 50 years of
age
133
127
109
107
76
119
102
97
79
83
C4
50.
133
127
109
107
76
For full points the problem must be setup as follows:
1. Set up problem using six step process
2. Enter table data into Minitab using data shown in table above.
3. Run Chi square Stat>Tables Cross tabulation and Chi square test two way table in
worksheet.
4. Be sure not to enter row or column totals into your table as the outcome will
include these values.
5.
Test for independence between the media source and age.
6. State your conclusion using both the critical value/critical ratio technique and the pvalue
7. Examine the Minitab readout to make sure Cochran's rule is observed.
8. If statistically significant at alpha .05 pick a medium and age and discuss whether the
cell is over represented or under-represented. Place this discussion in your
interpretation section along with your interpretation of the overall outcome of the test.
