Finding areas for z using excel
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This document provides instructions for using the NORMDIST and NORMINV functions in Excel to find areas under the normal curve and find x-values given areas. For NORMDIST, the user enters values for x, mean, standard deviation and selects true for cumulative to find the area from the left of the distribution to x. For NORMINV, the user enters the probability, mean and standard deviation to find the x-value corresponding to that area. Both note that results are for the cumulative area and adjustments may be needed for the area between the mean and x.
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Finding areas for z using excel
- 1. FINDING AREAS FOR Z AND USING Z IN FINDING X GIVEN AREA USING EXCEL FINDING AREAS FOR Z 1. Click Formulas 2. Function 3. Choose NORMDIST 4. OK
- 2. 5. Type the value of x in the X box 6. Type the value of the mean in the Mean box 7. Type the value of the standard deviation in the Standard_dev box 8. In the Cumulative box type true 9. Notice the results are for the area from the far left of the distribution up to X. If you are interested in the area between the mean and X, you will need to subtract .500 from the cumulative area.
- 3. USING Z IN FINDING X GIVEN AREA USING EXCEL 1. Click Formulas 2. Function 3. Choose NORMINV 4. OK
- 4. 5. Type the probability value in the Probability box 6. Type the mean value into the Mean box 7. Type the standard deviation into the Standard_dev box 8. Notice the results are for the area from the far left of the distribution up to X. If you are interested in the area between the mean and X, you will need to subtract the cumulative area from .500.