In hypothesis testing if the null hypothesis has been rejected when the alternative hypothesis has been true,
a. a Type I error has been committed
b. a Type II error has been committed
c. either a Type I or Type II error has been committed
d. the correct decision has been made
Question 2
A sample of 36 patients in a doctor's office showed that they had to wait an average of 45 minutes with a standard deviation of 10 minutes before they could see the doctor. Provide a 90 confidence interval estimate for the average waiting time of all the patients who visit this doctor.