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Chapter 12 Suppose the National Transportation Safety Board (NTSB) wants to examine the safety of compact cars, midsize cars, and full-size cars. It collects a sample of three for each of the treatments (cars types). Using the hypothetical data provided below, test whether the mean pressure applied to the driver's head during a crash test is equal for each types of car. Use a = .05. Compact Cars Midsize Cars Full-size Cars 543 429 484 655 427 456 702 525 402 G= 4723 7=2000 7=1381 7=1342 MI-524.78 M = 666.67 M = 460.33 M =447.33 *=3 SS = 1944.67 SS = 6274.67 SS = 3474.67 N=9 EX= 2581069 1. What are your null and alternative hypotheses? 2. What is your critical value? a. dfwithin = b. dfbetween = 3. What are your SS? SSt = SSw = SSD = 4. What is your calculated F-Ratio? a. MSb = b. MSw = c. F = 5. What can you conclude about the safety of the size of cars? (All three parts) 6. Post Hoc Needed? If so, calculate and interpret