Activity 1 Table 1. Results of one coin tossed 20 times. Outcomes Observed (O) Expected (E) (O-E) (O-E) (OE)²/E Heads (H) Tails (T) Totals XX²= 1. Do the observed results correspond exactly to the expected, or is there some variation? 2. Why would you expect some deviations from the expected? 3. If Activity 1 had been an experiment, what would the null hypothesis have been? 4. Do you accept or reject your null hypothesis for the data in Table 1?

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