REVIEW

Which of the following best describes predictive analysis?

• A. Describes past data only

• B. Foresees the future outcomes using historical data

• B. Foresees the future outcomes using historical data

• D. Focuses on business process automation

Which of the following best defines machine learning?

• A. Writing explicit rules for every possible situation

• B. Enabling systems to improve performance from data and experience

• C. Building databases for faster queries

• D. Automating hardware connections

What is the main factor that influences predictions in KNN?

• A. Decision boundaries

• B. Random weight initialization

• C. Distance to nearest neighbors

• D. Gradient descent

In simple linear regression, the slope coefficient represents:

• A. The correlation strength only

• B. The average change in 𝑦per unit change in 𝑥

• C. The total variance of 𝑦

• D. The residual sum of squares

Which of the following is NOT a descriptive statistic?

• a) Mean

• b) Variance

• c) Standard Deviation

• d) Hypothesis Test

Skewness in descriptive statistics measures:

• A. The spread of data

• B. The asymmetry of data distribution

• C. The average of the dataset

• D. The variation from the mean

If a dataset is highly skewed, which measure of central tendency is least reliable?

• a) Mean

• b) Median

• c) Mode

• d) Standard Deviation

Standard deviation is a measure of:

• a) Central tendency

• b) Spread/Dispersion

• c) Skewness

• d) Correlation

The measure that divides a dataset into two equal halves is:

• a) Mean

• b) Mode

• c) Median

• d) Variance

Power BI is developed by:

• a) Google

• b) IBM

• c) Microsoft

• d) Oracle