Use Excel to find the critical value of z

Use Excel to find the critical value of z
Use Excel to find the critical value of z for each hypothesis test. (Negative values should be indicated by a minus sign. Round your answers to 3 decimal places.)

(a)2 percent level of significance, two-tailed test.

Critical value of z±

(b)1 percent level of significance, right-tailed test.

Critical value of z

(c)5 percent level of significance, left-tailed test.

Critical value of z