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9. A telephone company claims that more than 15% of its customers have two or more phone lines. The company selects a random sample of 500 customers and finds that 90 customers have two or more phone lines. At a = 0.10, test the company's claim by hand. Null and Alternative Hypotheses Critical Value or P-Value H : H: Standardized Test Statistic Decision and Summary in Terms of the Claim Z= 10. Ten students took the SAT. Later on, they completed an SAT preparation course before retaking the SAT. Their before and after scores are listed below. Test the claim that the preparation course had no effect on their scores. Use a = 0.05. Assume that the distribution is normally distributed. Student 1 2 3 4 5 6 7 8 9 10 Before 720 860 850 880 710 850 1200 950 860 960 After 740 860 840 920 720 840 1240 970 890 930 Century College