Scores in an exam to measure understanding of probability before a class is taught at a...
Scores in an exam to measure understanding of probability before a class is taught at a university have an average of 35 with standard deviation 5. After the course is taught, the average exam score is 80 with standard deviation 6. There is a correlation between the pre-class and post-class score of 0.7. The scores are jointly distributed according to the bivariate normal distribution.
(a) What is the probability that the post-course score (the score after the course has been taken) is larger than 90?
(b) What is the probability that for those who score 45 in the pre-course test, the score is larger than 90 in the post course test?
(c) What is the variance of the sum of the pre and post-course scores?
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Scores in an exam to measure understanding of probability before
a class is taught at a...
The following data represent exam scores in a statistics class taught using traditional lecture and a...
The following data represent exam scores in a statistics class taught using traditional lecture and a class taught using a pped" classroom Complete parts a through below Traditional 697 69 0 78 5 67 6 85 3 794 56 2 808 80.5 716631 69 8 604 775 125 629 713 770 918 795 77.1 830 69,4 910 782 765 Flipped (b) Which course has more dispersion in exam scores using the sample standard deviation as the measure of dispersion? The...
The following data represent exam scores in a statistics class taught using traditional lecture and a...
The following data represent exam scores in a statistics class taught using traditional lecture and a class taught using a "flipped" classroom. Complete parts (a) through (c) below. Traditional 70.8 68.8 79.4 66.9 85.9 77.1 55.6 80.6 81.5 70.9 64.0 69.6 59.5 Flipped 75.5 72.0 63.1 73.4 76.9 92.8 78.0 75.9 81.1 69.6 91.8 78.9 75.9 (a) Which course has more dispersion in exam scores using the range as the measure of dispersion? The traditional course has a range of...
In Professor Friedman's economics course the correlation between the students' total scores before the final examination...
In Professor Friedman's economics course the correlation between the students' total scores before the final examination and their final examination scores is r = 0.66. The pre-exam totals for all students in the course have mean 265 and standard deviation 39. The final exam scores have mean 90 and standard deviation 11. Professor Friedman has lost Julie's final exam but knows that her total before the exam was 320. He decides to predict Julie's final exam score from her pre-exam...
3.2.17 e statlistics class taught unsing traditional lechure and a class taught using a "ipped classroom...
3.2.17 e statlistics class taught unsing traditional lechure and a class taught using a "ipped classroom Complete parts (a) theough (c) below The following dala represent exam scores in a Traditional 702 699 795 67 5 865 774 565 825 798 705 64.7 692 59 770 708 633 734 776 924 794 764 833 709 916 770 764 Flipped (e) Which course has more dispersion in exam scores using the range as the measure of dispersion? The tadinal course has...
In Professor Friedman's economics course the correlation between the students' total scores before the final examination and their final examination scores is r-0.56.
In Professor Friedman's economics course the correlation between the students' total scores before the final examination and their final examination scores is r-0.56. The pre-exam totals for all students in the course have mean 286 and standard deviation 28, The final exam scores have mean 90 and standard deviation 9. Professor Friedman has lost Julie's final exam but knows that her total before the exam was 320, He decides to predict Julie's final exam score from her pre exam total. Question...
In Professor Friedman's economics course the correlation between the students' total scores before the final examination...
In Professor Friedman's economics course the correlation between
the students' total scores before the final examination and their
final examination scores is r = 0.52. The pre-exam totals
for all students in the course have mean 276 and standard deviation
21. The final exam scores have mean 50 and standard deviation 9.
Professor Friedman has lost Julie's final exam but knows that her
total before the exam was 318. He decides to predict Julie's final
exam score from her pre-exam...
7. Scores on a recent national Mathematics exam were normally distributed with a mean of 82...
7. Scores on a recent national Mathematics exam were normally distributed with a mean of 82 and a standard deviation of 7. A. What is the probability that a randomly selected exam score is less than 70 B. What is the probability that a randomly selected exam score is greater than 90? C. If the top 2.5% of test scores receive Merit awards, what is the lowest score necessary to receive a merit award?
Example 3 The scores on a midterm exam follow a normal distribution with an average of...
Example 3 The scores on a midterm exam follow a normal distribution with an average of 80.4% and a standard deviation of 10.9%. Let X represent the score of a given student on this midterm exam. 1. What is the probability that a randomly selected student scores above a 90%? 2. What is the probability that a randomly selected student scores between 80% and 90%? 3. What is the 60th percentile score for this midterm exam?
Consider the following scatterplot, regression equation, and correlation of midterm and final exam scores for a...
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...
Suppose that you are analyzing test scores of the final exam in your class that are...
Suppose that you are analyzing test scores of the final exam in your class that are normally distributed, which of the following expressions can be applied for a continuous probability density function when the mean of the test score is 79.5%? a. The probability of obtaining a score of 79.5% on the final exam is 0. b. The probability of obtaining a score of 79.5% on the final exam is 1. c. The probability of obtaining a score greater than...
The following data represent exam scores in a statistics class taught using traditional lecture and a class taught using a pped" classroom Complete parts a through below Traditional 697 69 0 78 5 67 6 85 3 794 56 2 808 80.5 716631 69 8 604 775 125 629 713 770 918 795 77.1 830 69,4 910 782 765 Flipped (b) Which course has more dispersion in exam scores using the sample standard deviation as the measure of dispersion? The...
The following data represent exam scores in a statistics class taught using traditional lecture and a class taught using a "flipped" classroom. Complete parts (a) through (c) below. Traditional 70.8 68.8 79.4 66.9 85.9 77.1 55.6 80.6 81.5 70.9 64.0 69.6 59.5 Flipped 75.5 72.0 63.1 73.4 76.9 92.8 78.0 75.9 81.1 69.6 91.8 78.9 75.9 (a) Which course has more dispersion in exam scores using the range as the measure of dispersion? The traditional course has a range of...
3.2.17 e statlistics class taught unsing traditional lechure and a class taught using a "ipped classroom Complete parts (a) theough (c) below The following dala represent exam scores in a Traditional 702 699 795 67 5 865 774 565 825 798 705 64.7 692 59 770 708 633 734 776 924 794 764 833 709 916 770 764 Flipped (e) Which course has more dispersion in exam scores using the range as the measure of dispersion? The tadinal course has...
In Professor Friedman's economics course the correlation between the students' total scores before the final examination and their final examination scores is r-0.56. The pre-exam totals for all students in the course have mean 286 and standard deviation 28, The final exam scores have mean 90 and standard deviation 9. Professor Friedman has lost Julie's final exam but knows that her total before the exam was 320, He decides to predict Julie's final exam score from her pre exam total. Question...
In Professor Friedman's economics course the correlation between
the students' total scores before the final examination and their
final examination scores is r = 0.52. The pre-exam totals
for all students in the course have mean 276 and standard deviation
21. The final exam scores have mean 50 and standard deviation 9.
Professor Friedman has lost Julie's final exam but knows that her
total before the exam was 318. He decides to predict Julie's final
exam score from her pre-exam...
Example 3 The scores on a midterm exam follow a normal distribution with an average of 80.4% and a standard deviation of 10.9%. Let X represent the score of a given student on this midterm exam. 1. What is the probability that a randomly selected student scores above a 90%? 2. What is the probability that a randomly selected student scores between 80% and 90%? 3. What is the 60th percentile score for this midterm exam?
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...
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