Descriptive Analytics and Statistics Worksheet

What is the primary question answered by descriptive analytics?

• What will happen next?

• Why did it happen?

• What’s happening?

• How can we make it happen?

Descriptive analytics primarily deals with:

• Predicting future trends

• Prescriptive optimization

• Summarizing past data

• Designing experiments

Which of the following is NOT a technique used in descriptive analytics?

• Data interpretation

• Data visualization

• Regression modeling

• Summary statistics

Descriptive analytics can be used to detect:

• Correlations only

• Future trends

• Mistakes, outliers, and anomalies

• Causality

In univariate non-graphical analysis, data represents:

• The entire population only

• A single variable distribution

• Multivariate relationships

• Prediction models

Which measure of central tendency is most affected by outliers?

• Mean

• Median

• Mode

• Range

For skewed data, the best measure of central tendency is:

• Mean

• Mode

• Median

• Variance

The inter-quartile range (IQR) is defined as:

• Q1 - Q3

• Q3 - Q1

• Q2 - Q1

• Q3 - Q2

In a normal distribution, approximately 95% of values lie within:

• 1 SD of the mean

• 2 SD of the mean

• 3 SD of the mean

• 4 SD of the mean

A Z-score tells us:

• The median position of the data

• How many standard deviations a value is from the mean

• The inter-quartile range

• The skewness of data