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) M1 - 265 RAZ = 274 Standard deviation(feet per minute) 51 =52 SZ= 35 Sample size hi= 40 nzz 40 Do individuals walk at different speeds depending on whether they are departing or arriving at the a=0.10 level of significance? Ho: MI = MZ HI: M. F M 2 2 = 0. 10 t = X- x2 - (M , - M2 ) 265- 274 512 522 + 352 =- 0. 9001 ni + 522 n2 40 Critical value = (- 2 2 12, 2 412 ) = (-1.6449 , 1.6449) Test statistic lies under the critical value, so we do not have sufficent evidence to reject the null Hypothesis CHO)