The average age of licensed drivers in a particular county is = 41.6 years, = 12, and the distribution is approximately normal. A county police officer was interested in whether the average age of drivers receiving speeding tickets differed from the average age of the driving population. She obtained a sample of n = 16 drivers who had recently received tickets for speeding. The average age for this sample was M = 34.4 years.

Use this information to answer the following questions.

a) What are the null and alternative hypotheses for this research study? (1 mark)

b) An analysis is conducted using the data described above to determine if the average age of drivers receiving speeding tickets was different from the average age of licensed drivers. Results yielded z = -2.40, p = .0082. If the researcher used = .01 as their criteria, what decision would they make about the null hypothesis and why? (1 mark)

c) What would you conclude based on the results of the analysis conducted in question b? (i.e., relate the result of the analysis back to the research hypothesis) (1 mark)