23. A researcher notices that in a sample of adults, those who take larger amounts of vitamin C have fewer illnesses. However, those who take larger amounts of vitamin C also tend to exercise more. As explanations for having fewer illnesses, the variables "amount of vitamin C taken" and "amount of exercise" are variabies. A) skewed B) confounding C) response D) symmetric 4. Following is the output from R for a regression model predicting the murder rate "MURDERS" (per million people) from the level of unemployment ("UNEMP") Write the regression model. NOTE: You won't have space at #24 on the answer sheet, so write your answer at the bottom of the answer sheet in the space provided. Ca77: 7m (formu 7a= murderspermi 1 unemployment) The finurommental Protection Agency reconds data on the fuet econony of many differem makes of cars. 5. Data on the mileage of 20 randomly selected cars are listed below. The values are ordered for convenience. What is the median mileage for these 20 cars? Write your answer on the answer A) 17.5 miles per gallon B) 19 miles per gallon C) 19.5 miles per gallon D) 20 miles per gallon 6. If the value 29 was mistyped and should really be 92 (hybrid car), what wou median mileage be for these 20 cars? A) It would be the same. B) It would be higher. C) It would be lower. D) We cannot determine this from the given information