ZTEST Function returns the one-tailed probability value of a z-test. For a given hypothesized sample mean and a given set of values, the Excel ZTEST function calculates the one-tailed probability value of the Z-Test.
The function will return the probability that the supplied hypothesized sample mean is greater than the mean of the supplied data values.
Note: This function is replaced with one or more new functions that provide improved accuracy. Currently, this function is still available for backward compatibility.
You must consider using the new functions, because this function may not be available in future versions of Excel.
Syntax for ZTEST Function
=ZTEST(array,x,[sigma])
Arguments
Array: The set of values against which the hypothesized sample mean is to be tested.
X: The hypothesized sample mean.
Sigma: An optional argument that represents the population standard deviation. If unknown or not provided the calculation uses the sample standard deviation.
I have created the infographics for the ZTEST Function. With the help of these infographics, you can easily learn step by step process for using this excel functions.
Furthermore, Excel consists of many inbuilt functions which are helpful in the analytical and statistical study of number.
Simply follow the instructions in the infographics below:
#N/A error occurs when the supplied array is empty.
#NUM! error occurs if the [sigma] argument is supplied and is equal to zero.
#DIV/0! error occurs when the [sigma] is not supplied and the standard deviation of the supplied array is zero. The second reason for #DIV/0! is if the supplied array contains just one value.
#VALUE! error occurs if either the supplied x or sigma is non-numeric.
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