Lengths (in minutes) of movies showing during a week in 2004 were recorded to see if there is a significance difference in lengths for movies rated PG, PG-13, or R.
a. Use software to compare mean lengths of movies with the different ratings; first report the F statistic.
b. What is the P-value?
c. Choose which one of the following conclusions is correct:
1. Mean lengths of sampled movies are the same for all three ratings.
2. Mean lengths of all movies are the same for all three ratings.
3. Mean lengths of all movies may be the same for all three ratings.
4. Mean lengths of all movies are different for all three ratings.
5. Mean lengths of all movies are different for at least two of the three ratings.