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If both groups started with about 30 people (28 in one, 32 in the other) and at the end, one group had 20 and the other had 26. Why is that a problem?

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The types of validity are noted.

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1. If both groups started with about 30 people (28 in one, 32 in the other) and at the end, one group had 20 and the other had 26. Why is that a problem?

Since, reliability "estimates the consistency of your measurement, or more simply the degree to which an instrument measures the same way each time it is used in under the same conditions with the same subjects" this drop out seems to be more of a ...

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