One way an investigator can reduce sampling error is to: A)increase the sample sizes for the various groups B)define the groups such that the variances of scores in the populations (ó²)will be relatively small C)a and b D)neither a nor b

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Increasing the sample sizes will reduce the sampling error for each group, as a larger sample size will provide a more accurate representation of the population. Defining the groups in such a way that their variances are relatively small will also reduce sampling error, as this will ensure that the scores within each group are more similar to each other and therefore more representative of the population. Therefore, combining both strategies (a and b) will result in the greatest reduction of sampling error.

One Way an Investigator Can Reduce Sampling Error Is To