W8 EDA and Data Preprocessing

Which one below is not a part of exploratory data analysis (EDA)?

• Detecting mistakes and identifying anomalies in the data

• Discovering patterns or insights to enlighten modeling analysis

• Confirming which variable is the most significant in predicting the output

• Determining the relationships between independent and dependent variables

By definition, an outlier is any value more than three standard deviations from the mean.

• True

• False

If a supplier's data is missing due to some random system errors that frequently occur over time, it is

• missing completely at random

• missing almost at random

• missing at random

• missing not at random

If a customer's income data is missing due to possible sensitive values that are related to some demographics, it is

• missing completely at random

• missing almost at random

• missing at random

• missing not at random

For a right-skewed variable, we can use _____ (you can choose more than one option) to transform it and reduce skewness.

• log function

• exponential function

• square root function

• logistic (response) function