With a perfectly balances roulette wheel, in the long run, red numbers should turn up 18 times in 38. To test its wheel, one casino records the results of 3,800 plays, finding 1,890 red numbers. Is that too many reds? Or chance variation? (a) Formulate the null and alternative hypotheses as statements about a box model. (b) The null says that the percentage of reds in the box is _____. The alternative says that the percentage of reds in the box is ______. Fill in the blanks. Solution Ho: p=18/38 H1: p18/38 Test statistic: z = (p_hat - p)/sqrt(p(1-p)/n) = (1890/3800 - 18/38)/sqrt((18/38)*(1-18/38)/3800) = 2.92 p-value = 2* z(2.92) = 2*0.0017 = .0034 Reject Ho since p-value is less than =0.05. The sample indicates that there were too many reds..