1. A bus company in Manila claims that the mean waiting time for a bus during rush hour is less than 12 minutes. A random sample of 30 waiting times has a mean of 15 minutes with a standard deviation of 4.8 minutes a. What is the parameter in the problem? b. What is the claim in the problem? . Formulate the null hypothesis in symbol d. Formulate the alternative hypothesis in words. e. What tailed-test is applied in the