In a left-tailed test, if a statistician gets a z test statistic of -1.720, the p-value of this test would be equal to 0.0427.
What is a z-score?
A z-score is also known as a standard score and it can be defined as a measure of the distance between a raw score and the mean, when standard deviation units are used.
How to calculate value of the test statistic?
The test statistic can be calculated by using this formula:
[tex]t=\frac{x\;-\;u}{\frac{\sigma}{\sqrt{n} } }[/tex]
Where:
- is the standard deviation.
- n is the number of population.
In this scenario, the p-value will be given by:
P(Z > -1.720) = 0.0427
P ( Z > -1.720 ) = 0.0427.
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