Homework Answers
from given data" predicted final score from mean =(r*sy/sx)*(x-xbar)= (0.58)*(18/15)*(-21)= -14.6
therefore the predicted final exam grade is 14.6 below the mean on the fianl
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In a large class, there were 205 students who wrote both the midterm and the final...
A Statistics professor assigned 10 quizzes over the course of the semester.
A Statistics professor assigned 10 quizzes over the course of the semester. He wanted to see if there was a relationship between the total mark of all 10 quizzes and the final exam mark. There were 203 students who completed all the quizzes and wrote the final exam. The standard deviation of the total quiz marks was 15, and that of the final exam was 16. The correlation between the total quiz mark and the final exam was 0.8. Based on...
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The table below gives the number of hours ten randomly selected students spent studyling and their corresponding midterm exam grades. Using this data, consider the equation of the regression line, -bo +bix, for predicting the midterm exam grade that a student will earn based on the number of hours spent studying. Keep in mind, the correlation coefficient may or may not be statistically significant for the data given. Remember, in practice, it would not be appropriate to use the regression...
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A Statistics professor assigned 10 quizzes over the course of the semester. He wanted to see if there was a relationship between the total mark of all 10 quizzes and the final exam mark. There were 203 students who completed all the quizzes and wrote the final exam. The standard deviation of the total quiz marks was 15, and that of the final exam was 16. The correlation between the total quiz mark and the final exam was 0.8. Based on...
The grades of a class of 9 students on a midterm report (x) and on the final examination (y) are shown below. Use the data to complete parts (a) and (b). x 75 55 72 71 82 94 96 99 68 D y 80 73 78 36 48 84 99 99 70 (a) Estimate the linear regression line. 9=0.0* (Round the constant to one decimal place as needed. Round the coefficient to three decimal places as needed.) (b) Estimate the...
Consider the following scatterplot, regression equation, and correlation of midterm and final exam scores for a class of 15 students. Which of the following are true statements? Select one answer ı points Y ะ 90.6-0.489x , r -0.602 110 100 90 80 , 5어 2 20 40 60 80 100 Mdterm Exam Score I. The same number of students scored 100 on the midterm exam as scored 100 on the final exam. II. Students who scored higher on the midterm...
A teacher believes that the third homework assignment is a key predictor in how well students will do on the midterm. Let x represent the third homework score and y the midterm exam score. A random sample of last terms students were selected and their grades are shown below. Assume scores are normally distributed. HW3 Midterm 93.672 23.2 11.1 64.856 57.896 87.976 10.1 20.6 10.3 63.488 14.6 70.216 5.5 48.28 11 60.56 23.5 97.56 81.064 15.9 9.9 62.304 5.4 45.984...
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