Let us continue discussing the ideas about studying wines using analysis of variance begun in the introduction to this chapter. The four important wine grapes in the introduction are to be compared using ANOVA to see whether experts rate random samples of wines in these groups similarly, on average, or whether differences in average ratings exist that are due to the kind of grape used. The following data are scores on a 0-to-100 scale for these wines.
The above data are independent random samples of wine ratings in the four groups. Carry out an analysis of variance to determine whether average population ratings are equal for all groups, or whether there is statistical evidence for differences due to the kind of grape used. If you find such evidence, carry out further analysis to find out where these differences are.
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