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For the given alpha value first calculate (1- alpha value) = 1- 0.02 = 0.98

Now the next step is to calculate (1- alpha value)/ 2 = 0.98 / 2 = 0.49

So now z critical value is determined by looking into the z score table.

The corresponding value for 0.49 from the z score table is -2.0537.

For the given alpha value first calculate (1- alpha value) = 1- 0.6 = 0.4

Now the next step is to calculate (1- alpha value)/ 2 = 0.4 / 2 = 0.2

So now z critical value is determined by looking into the z score table.

The corresponding value for 0.2 from the z score table is 0.2533.