A random sample for 11 exam scores produced the following (hours of study, grade) data values.Hours Studied (X)Test Grade (Y)2 10 8 1 789 57 845 974 955596a. Compute the covariance.b. Compute the correlation coefficient.a. The covariance is(Round to three decimal places as needed.)507069010 209763

Hour StudiedX 2 10 8 1 7 5 9 5 6 10 2 Test GradeY 55 96 89 57 84 74 95 70 90 97 63

Answered: A random sample for 11 exam scores…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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The data below are the final exam scores of 10 randomly selected statistics students and the number of hours they studied for the exam. Calculate the correlation coefficient r. Hours, x 8 10 7 13 7 9. 9 10 11 8 Scores, y 61 76 56 84 62 74 81 86 86 67 Α. 0.761 В. 0.847 C. 0.991 D. 0.654
The following data gives the number of hours 10 students spent studying and their corresponding grades on their midterm exams. Hours Spent Studying 0 0.5 1 1.5 2 2.5 3 4 5 5.5 Midterm Grades 60 66 69 75 78 81 87 93 96 99 Calculate the correlation coefficient, r. Round your answer to three decimal places.
The data below are the final exam scores of 10 randomly selected statistics students and the number of hours they studied for the exam. Calculate the correlation coefficient r. Hours, x 8 10 7 13 7 9 9 10 11 8 Scores, y 72 87 67 95 73 85 92 97 97 78 Question content area bottom Part 1 A. 0.991 B. 0.847 C. 0.761 D. 0.654
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The data below are the final exam scores of 10 randomly selected statistics students and the number of hours they studied for the exam. Calculate the correlation coefficient r. Hours, x 1 3 0 6 0 2 2 3 4 1 Scores, y 67 82 62 90 68 80 87 92 92 73 Question content area bottom Part 1 A. 0.991 B. 0.847 C. 0.761 D. 0.654
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What is the relationship between the number of minutes per day a woman spends talking on the phone and the woman's weight? The time on the phone and weight for 7 women are shown in the table below. Time 47 65 51 50 76 46 60 Pounds 161 179 173 181 202 157 170 a. Find the correlation coefficient: r = 0.85 o Round to 2 decimal places. b. The null and alternative hypotheses for correlation are: Ho: H : The p-value is: 0.0154 o (Round to four decimal places) c. Use a level of significance of a = 0.05 to state the conclusion of the hypothesis test in the context of the study. There is statistically insignificant evidence to conclude that a woman who spends more time on the phone will weigh more than a woman who spends less time on the phone. There is statistically insignificant evidence to conclude that there is a correlation between the time women spend on the phone and their weight. Thus, the use of the regression line is not appropriate. There is statistically significant evidence to…

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