A recent study indicated that the typical American went on 4 family vacations as a child. A financial analyst claims that the average number of vacations taken by American children is less than 4. If you were to conduct a hypothesis test to investigate this situation, which test direction and distribution would be appropriate? (Assume that the parent distribution is approximately normal.) Left-tailed test, t distribution Right-tailed test, t distribution Two-tailed test, t distribution Left-tailed test, z distribution O Right-tailed test, z distribution . Two-tailed test, z distribution