Z value for difference in mean for 20 year period

P (Z <= z) one-tail

0.370626

0.24992

0.101912

0.365219

0.173472

0.275591

z Critical one-tail

1.644854

1.644854

1.644854

1.644854

1.644854

1.644854

P (Z <= z) two-tail

0.741251

0.49984

0.203824

0.730437

0.346944

0.551182

z Critical two-tail

1.959964

1.959964

1.959964

1.959964

1.959964

1.959964

Z value for difference in median for 20 year period

P (Z <= z) one-tail

0.371802

0.251789

0.102544

0.366257

0.173583

0.274815

z Critical one-tail

1.644854

1.644854

1.644854

1.644854

1.644854

1.644854

P (Z <= z) two-tail

0.743603

0.503578

0.205089

0.732513

0.347166

0.549629

z Critical two-tail

1.959964

1.959964

1.959964

1.959964

1.959964

1.959964

Z value for difference in mean for 23 year period

P (Z <= z) one-tail

0.486365

0.471146

0.444333

0.484797

0.457901

0.472976

z Critical one-tail

1.644854

1.644854

1.644854

1.644854

1.644854

1.644854

P (Z <= z) two-tail

0.97273

0.942293

0.888665

0.969595

0.915802

0.945951

z Critical two-tail

1.959964

1.959964

1.959964

1.959964

1.959964

1.959964

Z value for difference in median for 23 year period

P (Z <= z) one-tail

0.484322

0.476576

0.442685

0.492345

0.458326

0.465706

z Critical one-tail

1.644854

1.644854

1.644854

1.644854

1.644854

1.644854

P (Z <= z) two-tail

0.968645

0.953153

0.885371

0.984691

0.916653

0.931412

z Critical two-tail

1.959964

1.959964

1.959964

1.959964

1.959964

1.959964