ACTIVITY ence quotient. Intelligence quotient (10) test scores are believed to have a mean of 100 and a population standard deviation of 15, In a random sample of 36 students in a high school, the mean IQ test score is 105. Researchers claim that the mean IQ test scores at this high school is statistically higher than 100 1) What is the hypothesized mean? Check Show answer 2) Is the hypothesis test two-tailed, right-tailed, or left-tailed? Type as two tailed, left tailed, or right-tailed Check Show answer 3) What is the z-score? Check Show