Question

It is advertised that the average braking distance for o sma cor troveling at 65 miles per hour equals 120 feet. A trensportation reseorcher wants to determine if the statement made in the advertisement is folse, meoning it is different than overtised. She randomly test drives 42 smoll cars ot 65 miles per hour and records te broking distance. The son ple average broking oisto ce is computed as 130 feet. Assume t otthe population standara devlaton Is 20 eet. Use 5% significance. Part 1 State the null hypothesis and the altemative hypothesis for testing that the average breaking distance is equal to 120 feet Part 2 State the criticel values) for testing this hypothesis Part 3 Colculate the test stotistic Z for testing this hypothesis Part 4 Sta conclusions te and support your

Answer 1