UnsplashのJames Wainscoatが撮影した写真
This post is following of the above post.
In the previous post I see mean of EMPLOYEE is 17.9 and mean of SELFEMPLOYED is 30.6.
Let's see whether the difference is statistically significant or not.
First, I load infer package.
Before doing statistical inference, let's do visualization.
I see SELFEMPLOYED Value is wider spreaded than EMPLOYEE Value.
Now, let's start statistial inference.
I will follow the methodology of B Inference Examples | Statistical Inference via Data Science (moderndive.com)
I calculate observed statistics, difference of mean, SELEMPLOYED mean - EMPLOYEE mean.
So, 12.7 is the difference.
Then, I make null distribution of the difference.
Now, I can do visualization for null distribution using visualize() function.
I see the center of stat is 0.
Let's see p-value on the above histogram.
I see the red vertical line is far away from the null distribution, it means p-value is very very small.
Let's calculate p-value.
Calculate p-value is 0. So I can say the difference of mean between SELFEMPLOYED and EMPLOYEE is statistically significant.
That's it thank you!
Thank you Statistical Inference via Data Science (moderndive.com) !
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