Business Analytics Review 2

Front

What is the main purpose of descriptive statistics?

Back

To summarize data using measures like mean and median

Front

What is the purpose of a box plot in EDA?

Back

To visualize the distribution and detect outliers in continuous data

Front

Which R function is used to calculate the mean of a numeric vector?

Back

mean()

Front

In probability, what does 'mutually exclusive' mean?

Back

Events that cannot occur at the same time

Front

Which statistical test would you use to determine if there is a significant association between two categorical variables?

Back

Chi-square test

Front

What does 'data imputation' involve in data cleaning?

Back

Replacing missing values with estimated values like mean or median

Front

Which R package is most commonly used for creating visualizations like scatter plots and bar charts?

Back

ggplot2

Front

What does the Central Limit Theorem state?

Back

The sampling distribution of the sample mean approaches normality as sample size increases

Front

In Tidyverse, which function is used to pivot data from wide format to long format?

Back

pivot_longer()

Front

Scaling in data preprocessing

Back

Standardizing variables to have a mean of 0 and standard deviation of 1