Statistics · Unit 5 · Paper 2

Regression Analysis unit test

A test on this unit alone, marked as a percentage and a letter grade — for the test your class is actually sitting, rather than for May. Answer everything, then submit once: seeing the answer to question 3 before attempting question 4 makes the final percentage meaningless.

Paper 1 Paper 2 Paper 3

Each paper is built from this unit’s 45 terms and is the same for everyone, so a teacher can assign “Unit 5, Paper 2” and every student sits the identical test. Multiple choice is marked objectively; the written sections you mark yourself against the model answer and rubric.

Suggested time 32 min 29 points0/17 attempted

Residual for a specific point

Sampling distribution of the slope

What r does not tell you

Why r² is not r squared conceptually

Choosing a transformation

Residual plot patterns

Reading standard error from output

Correlation coefficient r

Least-squares regression line

Interpreting r in context

Confidence interval for the slope in context

Extrapolation warning in slope inference

Short answer 1. Define or explain: Interpreting the y-intercept

3 pts

Short answer 2. Define or explain: High-leverage point

3 pts

Short answer 3. Define or explain: Swapping x and y

3 pts

Short answer 4. Define or explain: Residual

3 pts

Free response

5 pts

Eight students' study hours (x) and exam scores (y) give ŷ = 52 + 6.5x, with r = 0.87 and s = 4.2.

Interpret the slope in context.

Interpret r² in context.

A student who studied 5 hours scored 88 — find and interpret the residual.

Explain what s = 4.2 measures.