Returns the two-tailed P-value of a z-test. The z-test generates a standard score for x with respect to the data set (array) and returns the two-tailed probability for the normal distribution. You can use this function to assess the likelihood that a particular observation is drawn from a particular population.
Syntax
ZTEST(array,x,sigma)
Array is the array or range of data against which to test x.
X is the value to test.
Sigma is the population (known) standard deviation. If omitted, the sample standard deviation is used.
Remarks
Example
The example may be easier to understand if you copy it to a blank worksheet.
How?
- Create a blank workbook or worksheet.
- Select the example in the Help topic. Do not select the row or column headers.
Selecting an example from Help
- Press CTRL+C.
- In the worksheet, select cell A1, and press CTRL+V.
- To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Tools menu, point to Formula Auditing, and then click Formula Auditing Mode.
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