An Australian medical team wishes to test whether passive smoking affects the chance of children contracting branchitis. Historically, the disense has been known to occur at least cnce in 1515 of chasdeen aged 12 . The team analysed the results of a random sample of 30012 -year-old children who were passive smokers, and found that 30 of these had contracted bronchits at least once in their tives. Use a 5 s level of significance to test the ciaim that the proportion of children who are passive smokers is 20s. 1. The null and alternate typotheses are 2. The value of the test statistic is z=2.43 z=2,43 ct=2.89 z=2.89 3. The prvalue is 0.0150 0.0075 0.0020 0.0040 4. Bssed on this evidence, the conctusion is