An analyst is interested in testing whether four populations have equal means. The following sample data have been collected from populations that are assumed to be normally distributed with equal variances:

Sample 1 Sample 2 Sample 3 Sample 4 9 12 8 17 6 16 8 15 11 16 12 17 14 12 7 16 14 9 10 13 Conduct the appropriate hypothesis test using a significance level equal to 0.05.