A random sample of second year business students at a small Canadian university were polled by...
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A random sample of second year business students at a small Canadian university were polled by a researcher attempting to establish a relationship between hours of study in the week immediately preceding a major exam and the marks received on the exam. The data follows: Student 1 2 3 4 5 6 7 8 9 10 25 12 18 26 19 20 23 15 22 8e Hourse Exam (%)e 93 57 55 90 82 95 95 80 85 61 a. [5] Is there a relationship between time spent studying and exam grades? In order to answer this question you will need to calculate the correlation between the hours spent studying and marks obtained on the exam. What is the correlation between study time and exam grades? If there is a relationship, describe it in your own words. Do this by hand and show your work. You may of course use software to check your work. b. [5] Find the equation of the regression line for predicting exam scores from time spent studying. Do this by hand and show your calculations. c.[2] Calculate the coefficient of determination (by hand). Interpret your result. d. [2] Is the sign of the slope logical? If the slope had the opposite sign, what would that tell you? e. [2] What mark do you predict Aria will get on the exam if she spends 25 hours studying? A random sample of second year business students at a small Canadian university were polled by a researcher attempting to establish a relationship between hours of study in the week immediately preceding a major exam and the marks received on the exam. The data follows: Student 1 2 3 4 5 6 7 8 9 10 25 12 18 26 19 20 23 15 22 8e Hourse Exam (%)e 93 57 55 90 82 95 95 80 85 61 a. [5] Is there a relationship between time spent studying and exam grades? In order to answer this question you will need to calculate the correlation between the hours spent studying and marks obtained on the exam. What is the correlation between study time and exam grades? If there is a relationship, describe it in your own words. Do this by hand and show your work. You may of course use software to check your work. b. [5] Find the equation of the regression line for predicting exam scores from time spent studying. Do this by hand and show your calculations. c.[2] Calculate the coefficient of determination (by hand). Interpret your result. d. [2] Is the sign of the slope logical? If the slope had the opposite sign, what would that tell you? e. [2] What mark do you predict Aria will get on the exam if she spends 25 hours studying?
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Answer rating: 100% (QA)
x y xx yy xxyy 25 93 384400 1876900 84940 12 57 462400 4972900 151640 18 55 06400 5904900 19440 ... View the full answer
Related Book For
Statistics for the Life Sciences
ISBN: 978-0321989581
5th edition
Authors: Myra Samuels, Jeffrey Witmer, Andrew Schaffner
Posted Date:
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