e College Y! Yahoo The principal of East High School tells the district school board that the average SAT score for his students is not equal to 900 . Assuming that the population is normally distributed. Test the principal's claim at a 0.2 significance level. a.) The null and alternative hypothesis would be: Ho: M - 900 Ho: M - 900 Ho : = 900 Ho : p = 900 Ho: p = 900 Ho: p = 900 Ha:M > 900 Ha: M 900 Ha:p