1.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 significantly different for each type of car. Use = 5% to hand calculate and check your work in SPSS.

Compact carsMidsize carsFull-size cars

649

648

755

Hypotheses:

F_crit/threshold:

Find SS, df, MS, F_obt, for:

Source of Variation

Between groups

Within groups (error)

Total

Conclusion: