In order to compare the durability of four different brands of golf balls (Alpha, Best, Century, and Divot), the National Golf Association randomly selects balls of each brand and places each ball into a machine that exerts the force produced by a 250 yard drive. The number of simulated drives needed to crack or chip each ball is recorded. Use a significance level of 0.05 to conduct all hypothesis tests and construct confidence intervals.

Analysis of Variance

SourceDFSum of SquaresMean SquareFRatioProb > F

Brand338504.15012834.721.1742<.0001*

Error169698.400606.1

C. Total1948202.550

Select the correct null hypothesis.

At least two treatment means differ.

All treatment means equal zero.

At least two treatment means are equal

None of the treatment means are equal

All treatment means are equal,