example for z test for two sample mean
TRANSCRIPT
Atlanta Houston
85 125
65 110
100 105 z-Test: Two Sample for Means
120 120
115 85 Variable 1 Variable 2
125 115 Mean 91.71429 101.125
65 65 Known Variance 400 625
90 60 Observations 35 40
115 95 Hypothesized Mean Difference 0
70 105 z -1.8093
80 115 P(Z<=z) one-tail 0.035202
60 75 z Critical one-tail 1.644854
65 100 P(Z<=z) two-tail 0.070405
70 90 z Critical two-tail 1.959964
75 115
65 160
80 65
85 80
95 60
85 85
85 130
85 110
120 95
90 90
90 125
80 90
115 125
110 90
125 85
80 55
125 150
60 120
105 80
110 75
120 105
130
135
120
90
115
t-Test: Two-Sample Assuming Unequal Variances
Atlanta Houston
Mean 91.71429 101.125
Variance 445.5042 622.4199
Observations 35 40
Hypothesized Mean Difference 0
df 73
t Stat -1.76934
P(T<=t) one-tail 0.040506
t Critical one-tail 1.665996
P(T<=t) two-tail 0.081013
t Critical two-tail 1.992997