Question

10.2.1 The accompanying partially complete contingency table shows the responses to two treatments: Treatment 2 Response Success 70 Failure Total 100 200 (a) Invent a fictitious data set that agrees with the table and for which x0. (b) Calculate the estimated probabilities of suc- cess Pr Success Treatment 1) and Pr Success Treatment 2) for your data set. Are they equal? 10.2.6 It has been suspected that prolonged use of a lular telephone increases the chance of developing br cancer due to the microwave-frequency signal tha transmitted by the cell phone. According to this theo a cell phone is repeatedly held near one side of the head then brain tumors are more likely to develop on that of the head. To investigate this, a group of patients were studied who had used cell phones for at least 6 months prior to developing brain tumors. The patients were asked whether they routinely held the cell phone to a certain ear and, if so, which ear. The 88 responses (from those who preferred one side over the other) are shown in the following table. Do the data provide sufficient evidence to conclude that use of cellular telephones leads to an increase in brain tumors on that side of the 1s ry, if side head? Use a chi-square test against a directional alterna- tive following the five steps (a-e) in Exercise 10.2.4. Let a 0.05. Phone holding side Left 14 19 Right 28 27 Brain tumor side Left Right Total

Answer 1

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