4. Do people walk faster in airport when they are departing or when they are arriving? A researcher measured the walking speed of travelers in an airport and his finding is shown below: Departure Arrival Mean speed (feet per minute) M- 265 BAZ - 274 Standard deviation(feet per minute) 51:52 SZ= 35 Sample size M= 40 12- 40 Do individuals walk at different speeds depending on whether they are departing or arriving at the a=0.10 level of significance? Ho: M1= MZ HIM, IMZ DF = n-1=40-1= 39 4 =0. 10 - t = XI- X2 - ( M, - M2 ) 265- 274 + 522 =-5.74 SIZ n2 30.620 9.91 since to:-6:74 we Reject Ho since if lies in the critical Region, Just