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) 1 percent level of significance, two-tailed test.   Critical value of z           ±   (b) 5 percent level of significance, right-tailed test.   Critical value of z              (c) 10 percent level of significance

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.