Let Us Practice DIRECTION: Identify the parameter to be tested and state the null and alternative hypotheses for each scenario. Identify whether the test is one tailed or two tailed 1. An Obstetrician-Gynecologist believes that certain maternal milk will increase the birth weight of babies. The average birth weight of a Filipino newborn is 3 kg. 2. Mr. Velasco hypothesizes that the production cost of printing modules can be decreased by using a Risograph instead of a Photocopier. The mean cost per 500 sheets is P350.00. 3. A Grade-11 class adviser observed that the ages of her incoming students vary from 15 to 21 years. The average age of incoming senior high school students is 17 years. 4. A report states that the average monthly income of public high school teachers is P26 000. A random sample of salaries of 100 public high school teachers showed an average monthly salary of P27, 500. 5. A new Internet Service Provider (ISP) offers a cheaper alternative for an internet connection. The average cost for the same speed as other existing ISP is P1 699.00