A company's auditor believes the per diem cost in Windsor, Ontario, rose significantly between 2011 and 2021. To test this belief, the auditor samples 52 business trips from the company's records for 2011; the sample average was $195 per day, with a population standard deviation of $18.60. The auditor selects a second random sample of 46 business trips from the company's records for 2021; the sample average was $197 per day, with a population standard deviation of $15.30.

If he uses a risk of committing a Type I error of 0.01, the observed z is [ Select ] ["0.46", "-0.21", "-0.46", "1.91", "-2.67", "-0.58"] and the decision is to [ Select ] ["fail to reject the null hypothesis", "reject the null hypothesis"]