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What is the symbol for the difference between two population means? X b. u C. X1- X2 d. 01-12 c. p B P1 - P2 h. 01 - P2 15. A school district wondered if the average score of their students in the Math SAT exam differed from the national average of 450, A random sample of 30 seniors from the district had a mean of 486 with a sample standard deviation of 85. What is the P-value for the test of Ho : u = 450 versus Hip#450? a. 0.01 0.06 and will accept the shipment unless she has sufficient evidence that the proportion of defective potatoes significantly exceeds 6%. She plans to randomly sample 100 potatoes, Is this sample size large enough to perform a one-sample z test for the proportion? a. Yes, because n > 40. b. Yes, because there are no outliers or strong skewness in categorical data C. No, because 100(.06)