Jose predicted that he would sell 48 umbrellas. He actually sold 72 umbrellas. What are the values of a and b in the table below? Round to the nearest tenth if necessary. Percent Error Item Approximate value Exact value Error Absolute error Ratio Percent error Umbrellas 48 72 Negative 24 24 a b a = StartFraction 24 over 72 EndFraction; b = 33.3 percent a = StartFraction 24 over 48 EndFraction; b = 50 percent a = StartFraction 48 over 72 EndFraction; b = 67.7 percent a = StartFraction 24 over 24 EndFraction; b = 100 percent

If your score on your next statistics test is converted to a z score, which of these z scores would you prefer: minus2.00, minus1.00, 0, 1.00, 2.00? why? a. the z score of 2.00 is most preferable because it is 2.00 standard deviations above the mean and would correspond to the highest of the five different possible test scores. b. the z score of 0 is most preferable because it corresponds to a test score equal to the mean. c. the z score of minus2.00 is most preferable because it is 2.00 standard deviations below the mean and would correspond to the highest of the five different possible test scores. d. the z score of minus1.00 is most preferable because it is 1.00 standard deviation below the mean and would correspond to an above average