11. Four independent random samples of households in the four U.S. regions (Northeast, Midwest, South, and West), each with a sample size of 25, yielded data on last year's energy consumption. We are interested in assessing whether last year's average energy consumption was different among the four U.S. regions.

The ANOVA F-test for the data above gives a p-value of 0.032. Based on this information, what conclusion might you reach at the 5% significance level?

Group of answer choices

a. There is sufficient statistical evidence to conclude that the sample means are all equal.

b. There is no statistical evidence to suggest that the null hypothesis should be rejected.

c. There is sufficient statistical evidence to conclude that not all the population means are equal.

d. There is evidence to support the conclusion that all the population means are different.