TIBCO Spotfire Analytics and Statistics

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

Connects all points with a line

Answer

Groups points into clusters

Answer

Adds error bars to each point

Question 2

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

Accepted Answer

Exponential

Answer

Linear

Answer

Polynomial

Answer

Logistic

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 range of all data points

Answer

The standard deviation of residuals

Answer

The prediction range for new individual data points

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

The model's R² value visually

Answer

The historical variance of the training data

Answer

The confidence interval for the mean

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

Regression coefficient showing slope steepness

Answer

Pearson correlation coefficient

Answer

Root mean square error of the fit

Question 6

In Spotfire, which aggregation method computes the middle value of a sorted dataset?

Accepted Answer

Median

Answer

Avg

Answer

StdDev

Answer

Sum