For each of the following, use the available information to determine how many research subjects are needed to complete the study:

1. A 3 × 3 mixed factorial; each cell needs 10 participants

2. A 2 × 3 repeated‐measures factorial; each cell needs 20 participants

3. A 2 × 4 mixed factorial; each cell needs 8 participants

4. A 2 × 2 × 2 independent groups factorial; each cell needs 5 participants

5. A 2 × 2 matched groups factorial; each cell needs 8 participants

6. A 4 × 4 ex post facto factorial; each cell needs 8 participants