MATH 225N WEEK 8 ASSIGNMENT
QUANTITATIVE REASONING PRACTICE SET
2026 ACCURACY CONFIRMED
◉ Is correlation resistant to extreme observations? Explain. Answer:
No. (affect correlation significantly)
◉ What is the general form of a regression equation? Define each
variable in the equation. Answer: y(hat) = a + bx, y(hat) = predicted
y value, b = predicted slope and a = predicted y-intercept
◉ What is the difference between y and y hat? Answer: y = actual
responsive value
y hat = predicted responsive value
◉ What is extrapolation and why is this dangerous? Answer: making
predictions for explanatory outside range of observed and can be
very inaccurate
◉ R value : 0.45 Answer: positive, fairly weak association
QUANTITATIVE REASONING PRACTICE SET
2026 ACCURACY CONFIRMED
◉ Is correlation resistant to extreme observations? Explain. Answer:
No. (affect correlation significantly)
◉ What is the general form of a regression equation? Define each
variable in the equation. Answer: y(hat) = a + bx, y(hat) = predicted
y value, b = predicted slope and a = predicted y-intercept
◉ What is the difference between y and y hat? Answer: y = actual
responsive value
y hat = predicted responsive value
◉ What is extrapolation and why is this dangerous? Answer: making
predictions for explanatory outside range of observed and can be
very inaccurate
◉ R value : 0.45 Answer: positive, fairly weak association
