TIBCO Spotfire Analytics and Statistics 1

Question 1

In TIBCO Spotfire, what does adding a 'Trend Line' to a scatter plot provide?

Accepted Answer

Fits a mathematical model (e.g., linear, polynomial) to show data trends

Answer

A trend line fits a regression model to the scatter plot data, visually indicating the overall direction and rate of change.

Question 2

Which statistical curve type in Spotfire's trend line fits data that grows or decays exponentially?

Accepted Answer

Exponential

Answer

An exponential curve fits data where the rate of change is proportional to the current value, such as population growth.

Question 3

What does Spotfire's 'Confidence interval' band around a trend line represent?

Accepted Answer

The uncertainty range within which the true regression line likely falls

Answer

The confidence interval band shows the range where the true mean response line falls with a specified probability (e.g., 95%).

Question 4

In Spotfire, what does 'Prediction band' show on a trend line chart?

Accepted Answer

The range within which a new individual data observation is expected to fall

Answer

A prediction band is wider than a confidence interval and shows where individual future data points are expected to land.

Question 5

What statistic does Spotfire display as R² on a trend line, and what does it indicate?

Accepted Answer

Coefficient of determination showing how much variance in Y is explained by X

Answer

R² (coefficient of determination) ranges from 0 to 1 and indicates what fraction of the dependent variable's variance the model explains.

TIBCO - Spotfire Practice Test