Statistical Tests of Significance
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Two independent Samples Z test: Quantitative data
Formula used and other details
First Sample Mean (x̄
1
)
Get from data
Required
Arithmatic Mean of the first sample in your study.
Standard deviation of first sample (s
1
)
Required
First Sample Standard Deviation in your study
Sample Size in the first group
(N)
Required
One tailed or two tailed hypothesis
Second Sample Mean (x̄
2
)
Required
Arithmatic Mean of the second sample in your study.
Standard deviation of second sample (s
2
)
Required
Second Sample Standard Deviation in your study
Sample Size in the second group
(N)
Required
One tailed or two tailed hypothesis
Alpha % (type I error - in percentage)
%
Enter positive number between 0.01 to 99.99
Required
Commonly used values are 5%, 1% and 10%. If your significance level is 0.05, then enter 5
One sided or two sided
Enter either 1 or 2
Required
One tailed or two tailed hypothesis
Results