Modern Business Statistics

{Exercise 12.3}

During the first 13 weeks of the television season, the Saturday evening 8:00 p.m. to 9:00 p.m. audience proportions were recorded as ABC 29%, CBS 28%, NBC 25%, and independents 18%. A sample of 300 homes two weeks after a Saturday night schedule revision yielded the following viewing audience data: ABC 95 homes, CBS 70 homes, NBC 89 homes, and independents 46 homes. Test with  = .05 to determine whether the viewing audience proportions changed (Round your answer to 3 decimal places).

Test statistic =

{Exercise 11.03}

A sample of 16 items provides a sample standard deviation of 9.5. Test the following hypotheses using  = .05.

• 0 : 2  50
• a : 2 > 50

1. Calculate the value of the test statistic (to 2 decimals).
     
   What is your conclusion?
     

Repeat the hypothesis test using the critical value approach.
What is the rejection rule for this hypothesis test?
Reject 0 if 2