Neco 2023 Mathematics Question 28

Practice objective / multiple choice question 28 from the 2023 Neco Mathematics examination.

Neco 2023 Mathematics Objective / Multiple Choice Hard Difficulty
Question 28 NECO • 2023 • MATHEMATICS • objective

In a class of 40 students, the mean score of Exam A is 68 with a standard deviation of 8. The mean score of Exam B is 74 with a standard deviation of 6. The correlation coefficient between the two exam scores is 0.6.\n\n(a) Write the least‑squares regression line that predicts the Exam B score \(y\) from the Exam A score \(x\).\n(b) Using this line, estimate the Exam B score for a student who obtained 80 in Exam A.

Answer Options

A. Regression line: y = 0.40x + 43.4; predicted B score for A=80 is 75.4
Correct Answer B. Regression line: y = 0.45x + 43.4; predicted B score for A=80 is 79.4
C. Regression line: y = 0.5x + 38; predicted B score for A=80 is 78
D. Regression line: y = 0.45x + 40.0; predicted B score for A=80 is 76.0
Correct Answer
B
Correct Option:
Regression line: y = 0.45x + 43.4; predicted B score for A=80 is 79.4

About This Question

This is Neco 2023 Mathematics Question 28. It is one of the objective questions from the 2023 Neco Mathematics examination.

Difficulty level: Hard .

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