A previous study by Public Health Ontario found that at least 40.5% of teens have texted while driving. In a recent survey of 821 random sample of teen drivers, 311 have admitted that they have texted while driving. Use a 0.05 significance level to test the claim that the texting-while-driving rate has decreased since the previous study, and it is now less than 40.5%. a) State the null and alternative hypotheses. b) Calculate the test statistic (round it to 3 decimal places). c Find the critical value (round it to 3 decimal places). d) To apply normal approximation to the distribution of sample proportion, show that whether all 3 of the requirements of the normal approximation are satisfied. e) Make a conclusion based on your answer from part b) and c). Is there sufficient evidence that the texting-while-driving rate has decreased