TS Statistical Analysis & Reporting 2

Question 1

When analyzing test results, which measure of central tendency is MOST resistant to the influence of outliers?

Accepted Answer

Median

Answer

The median is resistant to outliers because it is based on position rather than magnitude of values.

Question 2

A test specialist notices that the standard deviation of test scores doubled from last quarter. What does this indicate?

Accepted Answer

Score distribution became more spread out

Answer

A larger standard deviation indicates greater variability or spread in the data distribution.

Question 3

Which statistical chart type is BEST suited for displaying the proportion of defects by category?

Accepted Answer

Pie chart

Answer

Pie charts effectively display parts-of-a-whole relationships, making them ideal for showing defect category proportions.

Question 4

In test reporting, a confidence interval of 95% for defect density means:

Accepted Answer

There is 95% certainty the true defect density falls within the interval

Answer

A 95% confidence interval means there is a 95% probability that the true population parameter lies within the calculated range.

Question 5

Which formula correctly calculates the defect removal efficiency (DRE)?

Accepted Answer

Defects found in testing / Total defects × 100

Answer

DRE = (Defects found before release / Total defects including post-release) × 100, measuring the percentage of defects caught before shipping.

(TS) Test Specialist Certification Practice Test