It is claimed that in a bushel of peaches, less than 10% are defective. A sample 400 peaches is examined and 50 are found to be defective. What is statistic? 1) +0.125 O2) +0.278 3) -1.645 4) +1.667 The mean annual income of certified welders is normally distributed with $50,000 and a population standard deviation of $2,000. The ship building association wishes to find out whether their welders earn more or less than $50,000 annually. The alternate hypothesis is that the mean is not $50,000. If the level of significance is 0.10, what is the decision rule? 1) Do not reject the null hypothesis if computed z lies between -1.65 and +1.65; otherwise, reject it. 2) Do not reject the null hypothesis if computed z is greater than 1.65; otherwise, reject it. 3) Do not reject the null hypothesis if computed z lies between -2.00 and +2.00; otherwise, reject it. 4) Reject the null hypothesis if computed z is below -2.00; otherwise, reject it