CAP Statistical Analysis & Modeling

Question 1

What is the primary purpose of statistical analysis in data science?

Accepted Answer

To uncover patterns and relationships in data

Answer

To store raw data

Answer

To ignore outliers in datasets

Answer

To eliminate the need for decision-making

Question 2

Which statistical measure describes the central tendency of a dataset?

Accepted Answer

Mean

Answer

Variance

Answer

Standard deviation

Answer

Correlation coefficient

Question 3

Which statistical test is commonly used to determine if two sample means are significantly different?

Accepted Answer

T-test

Answer

Chi-square test

Answer

Regression analysis

Answer

ANOVA

Question 4

What is the primary purpose of regression analysis in modeling?

Accepted Answer

To predict outcomes based on variable relationships

Answer

To visualize categorical data

Answer

To randomly categorize data

Answer

To remove all data variation

Question 5

Which statistical method is used to classify data into groups based on similarity?

Accepted Answer

Cluster analysis

Answer

Principal Component Analysis (PCA)

Answer

Linear regression

Answer

T-test

Question 6

Why is hypothesis testing important in statistical modeling?

Accepted Answer

To determine statistical significance of results

Answer

To ignore variability in data

Answer

To eliminate the need for data analysis

Answer

To make assumptions without testing