In a chemistry class, the average grade on the final examination was 60 with a standard...
In a statistics class, the average grade on the final examination was 75 with a standard deviation of 5. a. At least what percentage of the students received grades between 50 and 100? Determine an interval for the grades that will be true for at least 70% of the students. b.
A set of final examination grades in an introductory statistics course is normally distributed, with a mean of 73 and a standard deviation of 7. Complete parts (a) through (d). a. What is the probability that a student scored below 86 on this exam? (Round to four decimal places as needed.) b. What is the probability that a student scored between 66 and 93? (Round to four decimal places as needed.) c. The probability is 55% that a student taking...
Fifty students are enrolled in an Economics class. After the first examination, a randomsample of five papers was selected. The grades were 60, 75, 80, 70, and 90. Assume the distributionof all the grades is normal. Provide an approximate 90% confidence interval for the mean grade of allthe students in the class.
46 2 (6 points) A study was conducted to determine whether the final grade of a student in an introductory psychology course is linearly related to his or her performance on the verbal ability test administered before college entrance. The verbal scores and final grades for all 10 students in the class are shown in the table below. Student Verbal Score x Final Grade y 1 86 42 77 3 41 87 4 39 98 5 79 75 6 41...
Fifty students are enrolled in an Economics class. After the first examination, a random sample of five papers was selected. The grades were 60, 70, 75, 80, 90. a. Calculate the estimate of the standard error of the mean. b. What assumption must be made before we can determine an interval for the mean grade of all the students in the class? Explain why? c. Assume the assumption of part(b) is met. Provide a 90% confidence interval for the mean...
in a certain class, test scores average out to 60, with a standard deviation of 20, as do scores on the final. The correlation between test scores and the final scores is about 0.5. Estimate the average final score for the students whose test score was: 60 A. 60 B. 70 C. 50 D. 80
In a certain class, test scores average out to 60, with a standard deviation of 20, as do scores on the final. The correlation between test scores and the final scores is about 0.5. Estimate the average final score for the students whose test score was: 80 A. 67 B. 80 C. 85 D. 70
46 2 (6 points) A study was conducted to determine whether the final grade of a student in an introductory psychology course is linearly related to his or her performance on the verbal ability test administered before college entrance. The verbal scores and final grades for all 10 students in the class are shown in the table below. Student Verbal Score x Final Grade y 1 86 42 77 3 41 87 4 39 98 5 79 75 6 41...
Grading Policy In addition to three in-class tests and a final exam, the final grade will include assessment of homework, quiz projects/classroom activities, and classroom participation, according to the following weights 1. Homework and Worksheets 2. Three Tests 3. Final Exam 4. Quizzes and Class Participation/Classroom Citizenshi 1 5% 40% 25% 20% Total 100% Grad Ran 92 100 90-91 88-89 82-87 80-81 an 78 -79 70-77 68 -69 66 67 60- 65 Assignment Grading: Each written assignment, except the Final...
02 The following scores represent the final examination grades for an elementary statistics course: 23 60 79 32 57 74 52 70 82 36 80 77 81 95 41 65 92 85 55 76 52 10 64 75 78 25 80 98 81 67 41 71 83 54 64 72 88 62 74 43 60 78 89 76 84 48 84 90 15 79 34 67 17 82 69 74 63 80 85 61 Calculate: . Stem and leaf ....