Write the null and alternative hypothesis of the following. Choose between non-directional or directional test. 1. The I.Q.'s of scientist are greater than 115 2. There is no significant difference between the I.Qs of doctors and lawyer. 3. The average income of high school teachers is less than Php8000 per month 4. There is significant difference performance between of science high school graduates and non-science high school graduates. 5. There is no significant differences in Statistics grades between males and females.