Using the latest in medical technology an orthopedic doctor

Last updated: 5/27/2023

Using the latest in medical technology an orthopedic doctor has developed a new surgical procedure that he believes is an improvement over the standard procedure He wants to study whether the mean recovery time of patients who have the new procedure is less than the mean recovery time of patients who have the standard procedure The doctor studies a random sample of 11 patients who have the new procedure and a random sample of 10 patients who have the standard procedure These samples are chosen independently The doctor records each patient s recovery time in days The patients who had the new procedure have a sample mean recovery time of 363 5 with a sample variance of 2981 7 The patients who had the standard procedure have a sample mean recovery time of 415 4 with a sample variance of 249 8 Assume that the two populations of recovery times are approximately normally distributed Can the doctor conclude at the 0 01 level of significance that the population mean of the recovery times of patients who have the new procedure is less than the population mean of recovery times of patients who have the standard procedure Perform a one tailed test Then complete the parts below Carry your intermediate computations to three or more decimal places If necessary consult a list of formulas a State the null hypothesis Ho and the alternate hypothesis H Ho O H 0 b Determine the type of test statistic to use Choose one c Find the value of the test statistic Round to three or more decimal places d Find the critical value Round to three or more decimal places e At the 0 01 level of significance can the doctor conclude that the mean recovery time of patients who have the new procedure is less than the mean recovery time of patients who have the standard procedure QYes No XI 5 a S 0 0 OSO X 0 0 0 0 P B 20 O