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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  

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