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1 In order to calculate the variance, which of the following must you know? Range Median Mean Mode Why? 2- How could we measure how

1 In order to calculate the variance, which of the following must you know?

  1. Range
  2. Median
  3. Mean
  4. Mode

Why?

2- How could we measure how many pieces of candy each kid takes?

3- This is a tough one. I suggest you use Lee Becker's pooled variance program (use the hyperlink from a few slides back). Let's say you have a study looking at the DV "Time to help". Your IV is whether potential helpers did not see (condition #1) or saw (condition #2) someone else helping. The mean time to help for those in condition #1 was 58 seconds (variance was 2.81). The mean time to help for those in condition #2 was 55 seconds (variance was 3.06). First, tell me what Cohen's d (pooled) is. Second, tell me if the effect size is meaningful in terms or magnitude!

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