The grades for a sample of 5 students in a class are 20,60,80,90 and X where...
The grades for a sample of 5 students in a class are 20,60,80,90 and X where the grade of the 5th is illegible, and has been called X.I tis known that the mean grade for the sample is 67. What was the value of X ?
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The grades for a sample of 5 students in a class are 20,60,80,90
and X where...
1. The following data represent the homework grades and current course grades for fifteen students. Is...
1.
The following data represent the homework grades and current course
grades for fifteen students. Is there a correlation between
homewosk and the course at a 1% level significance?
1. The following data represent the homework grades and current course grades for fifteen students. Is there a correlation between homework grades and grades in the course at a 1% level of significance? Homework Grade Current Course Grade 56 65 69 (a) What are the null and alternative lıypotheses? (b) What...
1. A professor grades students on a normal distribution. For any grade x, based on a...
1. A professor grades students on a normal distribution. For any grade x, based on a course mean and standard deviation developed over years of testing, the following scale applies A': course grade 1.6 standard deviation above the mean 'B': course grade between 0.45 and 1.6 standard deviations above the mean C': course grade t 0.45 standard deviations from the mean. Assuming "large sample size", what percentage of students will receive an A in course? 2.61 % 3.78 % 4.95...
3 JU The grades of a class of 9 students on a midterm report (x) and...
3 JU The grades of a class of 9 students on a midterm report (x) and on the final examination () are as follows 67 99 96 94 81 72 71 50 77 68 99 99 85 47 34 78 66 82 x=85. Compute a 95% confidence interval for the mean response Hy/x when
Fifty students are enrolled in an Economics class. After the first examination, a random sample of...
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...
The grades of a class of 9 students on a midterm report (x) and on the...
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). (a) Estimate the linear regression line. x 77 55 73 71 81 92 97 99 66 y 82 73 77 36 49 82 99 99 67
Exam grades in my statics class tend to be normally distributed. I've been keeping long term...
Exam grades in my statics class tend to be normally distributed. I've been keeping long term records, and the mean grade is a 67, with a standard deviation of 13 (on a of 100 point exam). 9. What is the probability that a student gets a grade lower than a 90? 10. What fraction of the class would be expected to get a grade between 60 and 80? 11. What is the probability that one of my statics sections with...
5. North Carolina State University posts the complete grade distributions for its courses online. The distribution of grades for all students in all sections of Accounting 210 in the spring semester...
5. North Carolina State University posts the complete grade distributions for its courses online. The distribution of grades for all students in all sections of Accounting 210 in the spring semester of 2001 was Grade Probability .18 32 34 09 07 a. Using the scale A -4, B-3, C-2, D- 1, and F 0, let Xbe the grade of a randomly chosen b. Let X denote the mean grade for a random sample of 50 students from Accounting 210. Since...
Assume that class grades follow a normal distribution of mean μ = 75 and the variance...
Assume that class grades follow a normal distribution of mean μ = 75 and the variance σ2 =144. a) Find the probability that an individual's grade is greater than 81. b) What should be the interquartile range? c)Suppose you select at random (and independently) 10 students. What is the probability that only two of these students have a grade greater than 75? d) If you draw a sample of size n = 10 from the population of grades described in...
1) The grades of students in a class are distributed normally. The average grade of the...
1) The grades of students in a class are distributed normally. The average grade of the students in this class is 65; standard deviation is 2. The students who take the teacher give more points by making "systematic error". What is the passing score since it gives more than 25% of the class score in total? Calculate.
The grades of a class of 9 students on a midterm report (x) and on the...
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...
1.
The following data represent the homework grades and current course
grades for fifteen students. Is there a correlation between
homewosk and the course at a 1% level significance?
1. The following data represent the homework grades and current course grades for fifteen students. Is there a correlation between homework grades and grades in the course at a 1% level of significance? Homework Grade Current Course Grade 56 65 69 (a) What are the null and alternative lıypotheses? (b) What...
1. A professor grades students on a normal distribution. For any grade x, based on a course mean and standard deviation developed over years of testing, the following scale applies A': course grade 1.6 standard deviation above the mean 'B': course grade between 0.45 and 1.6 standard deviations above the mean C': course grade t 0.45 standard deviations from the mean. Assuming "large sample size", what percentage of students will receive an A in course? 2.61 % 3.78 % 4.95...
3 JU The grades of a class of 9 students on a midterm report (x) and on the final examination () are as follows 67 99 96 94 81 72 71 50 77 68 99 99 85 47 34 78 66 82 x=85. Compute a 95% confidence interval for the mean response Hy/x when
5. North Carolina State University posts the complete grade distributions for its courses online. The distribution of grades for all students in all sections of Accounting 210 in the spring semester of 2001 was Grade Probability .18 32 34 09 07 a. Using the scale A -4, B-3, C-2, D- 1, and F 0, let Xbe the grade of a randomly chosen b. Let X denote the mean grade for a random sample of 50 students from Accounting 210. Since...
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...
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