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Critical Z-values     Calculator Instructions:

If you have a probability under a normal distribution, this will calculate the z-value. Enter α value.
  Search Engine Shortcut Examples:

a=0.03
alpha=0.05
NORMSINV(0.95)
    
<-- Enter α
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Given α = 0.03, calculate the right-tailed and left-tailed critical value for Z

Calculate right-tailed value:
Since α = 0.03, the area under the curve is 1 - α → 1 - 0.03 = 0.97

Our critical z value is 1.8808
In Microsoft Excel, this function can be written in a cell as =NORMSINV(0.97)

Calculate left-tailed value:
Our critical z-value = -1.8808
In Microsoft Excel, this function can be written in a cell as =NORMSINV(0.03)


zProbability (Area under Curve)
0.01-2.3263
0.02-2.0537
0.03-1.8808
0.04-1.7507
0.05-1.6449
0.06-1.5548
0.07-1.4758
0.08-1.4051
0.09-1.3408
0.10-1.2816
0.11-1.2265
0.12-1.175
0.13-1.1264
0.14-1.0803
0.15-1.0364
0.16-0.9945
0.17-0.9542
0.18-0.9154
0.19-0.8779
0.20-0.8416
0.21-0.8064
0.22-0.7722
0.23-0.7388
0.24-0.7063
0.25-0.6745
0.26-0.6433
0.27-0.6128
0.28-0.5828
0.29-0.5534
0.30-0.5244
0.31-0.4959
0.32-0.4677
0.33-0.4399
0.34-0.4125
0.35-0.3853
0.36-0.3585
0.37-0.3319
0.38-0.3055
0.39-0.2793
0.40-0.2533
0.41-0.2275
0.42-0.2019
0.43-0.1764
0.44-0.151
0.45-0.1257
0.46-0.1004
0.47-0.0753
0.48-0.0502
0.49-0.0251
0.500
0.510.0251
0.520.0502
0.530.0753
0.540.1004
0.550.1257
0.560.151
0.570.1764
0.580.2019
0.590.2275
0.600.2533
0.610.2793
0.620.3055
0.630.3319
0.640.3585
0.650.3853
0.660.4125
0.670.4399
0.680.4677
0.690.4959
0.700.5244
0.710.5534
0.720.5828
0.730.6128
0.740.6433
0.750.6745
0.760.7063
0.770.7388
0.780.7722
0.790.8064
0.800.8416
0.810.8779
0.820.9154
0.830.9542
0.840.9945
0.851.0364
0.861.0803
0.871.1264
0.881.175
0.891.2265
0.901.2816
0.911.3408
0.921.4051
0.931.4758
0.941.5548
0.951.6449
0.961.7507
0.971.8808
0.9751.96
0.025-1.96
0.982.0537
0.992.3263
0.005-2.5758
0.9952.5758







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