Basics of ML & AL Week 2 Challenge

Week 2 Challenge

Ans 1

First businness moment = 1.4

Second Business Moment = 2.326

Third Business Moment = 0.4086

Fourth Business Moment = -30.7919

Ans 2

To calculate mean we sum up all the values and divide the sum with the count of values. This also can be said like , we divide each value by count and then sum up. Previous sentence can further be interpreted by saying that for each value/count in effect is similar to the probability that adds up.

mean= 2/4 + 4/4 + 6/4 +8/4

In probabilities, while calculating expected value we sum up just like above.

Ans 3

But if there's too much skewness in the data, then many statistical models don't work effectively. Why is that? In skewed data, the tail region may act as an outlier for the statistical model, and we know that outliers adversely affect a model's performance, especially regression-based models.

Ans 4

a) .82

b)

c)

d) 0

Ans 5

Its a normal distribution graph

50% of the data lie on the right side

34.1% of the data lie between 0 and 1

47.7% of the data lie between 0 and 2