4. Prior to the start of the season, it was expected that audience proportions for the four major
news networks would be CBS 28%, NBC 35%, ABC 22% and BBC 15%. A recent sample
of homes yielded the following viewing audience data.
Network
CBS
NBC
ABC
BBC
Number of
Homes
850
980
670
500
We want to determine whether or not the recent sample supports the expectations of the
number of homes of the viewing audience of the four networks.
a.
State the null and alternative hypotheses to be tested.
b. Compute the test statistic.
C.
The null hypothesis is to be tested at 95% confidence. Determine the critical value for
this test.
d. What do you conclude?
