Question

1. Define the parameter of interest, the appropriate null and alternative hypotheses, and explain what Type I and Type II errors mean in the context of the situation.
   To curb CO2 emissions, the government subsidized the purchase of green vehicles. Now, a study wants to investigate whether the average CO2 emissions from cars purchased last year has dropped from the 160 g/km of 5 years.

   σ known CI and Z test

Answer 1