Why 20 raisins were used rather than a sample of one raisin?

Using 20 raisins instead of just one provides a more reliable and representative sample that accounts for variability in size, moisture content, and flavor among the raisins. A single raisin might not accurately reflect the overall characteristics of the entire batch, leading to skewed results. By averaging the data from a larger sample, researchers can achieve more statistically valid conclusions. This approach helps ensure that findings are robust and applicable to the broader population of raisins.