MS-DS Master of Data science MS-DS Master of Data science Exploratory Data Analysis Questions and Answers 3

Question 1

What is the purpose of a QQ (quantile-quantile) plot in exploratory data analysis?

Accepted Answer

To assess whether data follows a theoretical distribution

Answer

A QQ plot compares the quantiles of observed data against quantiles of a theoretical distribution to check for distributional fit.

Question 2

Which measure of central tendency is most robust to outliers?

Accepted Answer

Median

Answer

The median uses only the positional middle value, so extreme outliers do not affect its calculation.

Question 3

During EDA, what does a high kurtosis value indicate about a distribution?

Accepted Answer

Heavy tails and a sharp peak relative to a normal distribution

Answer

High kurtosis (leptokurtic) means the distribution has heavier tails and a sharper central peak compared to a normal distribution.

Question 4

Which pandas method provides a quick statistical summary including count, mean, standard deviation, and quartiles?

Accepted Answer

describe()

Answer

The describe() method returns count, mean, std, min, 25%, 50%, 75%, and max for each numeric column.

Question 5

What is the main advantage of using a violin plot over a standard box plot?

Accepted Answer

It shows the full probability density of the data

Answer

Violin plots combine a box plot with a kernel density estimate, revealing the full shape of the distribution including multimodality.

MS-DS Master of Data science Practice Test