A group of students take Exam the average was M = 68 and the standard deviation...
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group of students take Exam the average was M = 68 and the standard
deviation...
Each year about 1500 students take the introductory statistics course at a large university. This year...
Each year about 1500 students take the introductory statistics course at a large university. This year scores on the nal exam are distributed with a median of 74 points, a mean of 70 points, and a standard deviation of 10 points. There are no students who scored above 100 (the maximum score attainable on the nal) but a few students scored below 20 points. (a) Is the distribution of scores on this nal exam symmetric, right skewed, or left skewed?...
if statistics test scores were normally distributed with a mean of 81 and a standard deviation...
if statistics test scores were normally distributed with a mean of 81 and a standard deviation of 4, a) what is the probability that a randomly selected student scored less than 70? b) what percentage of students had a B on the exam? c) the top 10% of the class had what grades?
Juan took a Statistics exam and earned a 90%. If the exam scores are normally distributed...
Juan took a Statistics exam and earned a 90%. If the exam scores are normally distributed with a mean = 75% and SD = 10%, what is Juan's z score? Based on his z score, what percentage of students scored below Juan? What is the probability of randomly selecting a student who scored below Juan?
THINKING/COMMUNICATION 7. A post-secondary class has 600 students. The mean grade on their midterm exam is...
THINKING/COMMUNICATION 7. A post-secondary class has 600 students. The mean grade on their midterm exam is 70%, with a standard deviation of 15. a. Find the Z-score of a student who scored 80% on his exam. [2 marks] b. Find the percentage of students who failed the exam. [3 marks] c. How many students failed the exam (i.e. scored less than 49%)? [1 mark] d. Your friend claims he scored in the 99th percentile on his exam. What mark must...
An exam is given to all senior high school students, the standard deviation for all the...
An exam is given to all senior high school students, the standard deviation for all the students is given as 30. The average score for 40 students on the exam is 250. Assume the means to be measured to any degree of accuracy (assume that scores are Gaussian distributed). (a) Find the 95% confidence interval (CI) for the average score of all students taking the exam. (b) Find the prediction interval for the score of the next student chosen at...
An exam is given to all senior high school students, the standard deviation for all the...
An exam is given to all senior high school students, the standard deviation for all the students is given as 30. The average score for 40 students on the exam is 250. Assume the means to be measured to any degree of accuracy (assume that scores are Gaussian distributed). (a) Find the 95% confidence interval (CI) for the average score of all students taking the exam. (b) Find the prediction interval for the score of the next student chosen at...
An exam is given to all senior high school students, the standard deviation for all the...
An exam is given to all senior high school students, the standard deviation for all the students is given as 30. The average score for 50 students on the exam is 540. ASS the means to be measured to any degree of accuracy (assume that scores are Gaussian distributed). (a) Find the 90% confidence interval (CI) for the average score of all students taking the exam. (b) Find the prediction interval for the score of the next student chosen at...
QUESTION 1 An exam is given to all senior high school students, the standard deviation for...
QUESTION 1 An exam is given to all senior high school students, the standard deviation for all the students is given as 30. The average score for 25 students on the exam is 440. Assume the means to be measured to any degree of accuracy (assume that scores are Gaussian distributed). (a) Find the 98% confidence interval (CI) for the average score of all students taking the exam. (b) Find the prediction interval for the score of the next student...
SORU 1 An exam is given to all senior high school students, the standard deviation for...
SORU 1 An exam is given to all senior high school students, the standard deviation for all the students is given as 30. The average score for 50 students on the exam is 540. Assume the means to be measured to any degree of accuracy assume that scores are Gaussian distributed Find the 90s confidence interval (C) for the average score of all students taking the exam, Find the prediction interval for the score of the next student chosen at...
Q1a, Q1b, The average height of a group of student is 68 inches with a standard...
Q1a,
Q1b,
The average height of a group of student is 68 inches with a standard deviation of 3 inches. The average shoe size is in this same group is 11 with a standard deviation of 2. If the covariance between them is 3.732, what is the variance of Height - ShoeSize? 3 different type of grains are sold by a farmer. Let X1, X2 and X3 be the weight of each grain with means 100, 200, and 300 pounds...
THINKING/COMMUNICATION 7. A post-secondary class has 600 students. The mean grade on their midterm exam is 70%, with a standard deviation of 15. a. Find the Z-score of a student who scored 80% on his exam. [2 marks] b. Find the percentage of students who failed the exam. [3 marks] c. How many students failed the exam (i.e. scored less than 49%)? [1 mark] d. Your friend claims he scored in the 99th percentile on his exam. What mark must...
An exam is given to all senior high school students, the standard deviation for all the students is given as 30. The average score for 40 students on the exam is 250. Assume the means to be measured to any degree of accuracy (assume that scores are Gaussian distributed). (a) Find the 95% confidence interval (CI) for the average score of all students taking the exam. (b) Find the prediction interval for the score of the next student chosen at...
An exam is given to all senior high school students, the standard deviation for all the students is given as 30. The average score for 40 students on the exam is 250. Assume the means to be measured to any degree of accuracy (assume that scores are Gaussian distributed). (a) Find the 95% confidence interval (CI) for the average score of all students taking the exam. (b) Find the prediction interval for the score of the next student chosen at...
An exam is given to all senior high school students, the standard deviation for all the students is given as 30. The average score for 50 students on the exam is 540. ASS the means to be measured to any degree of accuracy (assume that scores are Gaussian distributed). (a) Find the 90% confidence interval (CI) for the average score of all students taking the exam. (b) Find the prediction interval for the score of the next student chosen at...
QUESTION 1 An exam is given to all senior high school students, the standard deviation for all the students is given as 30. The average score for 25 students on the exam is 440. Assume the means to be measured to any degree of accuracy (assume that scores are Gaussian distributed). (a) Find the 98% confidence interval (CI) for the average score of all students taking the exam. (b) Find the prediction interval for the score of the next student...
SORU 1 An exam is given to all senior high school students, the standard deviation for all the students is given as 30. The average score for 50 students on the exam is 540. Assume the means to be measured to any degree of accuracy assume that scores are Gaussian distributed Find the 90s confidence interval (C) for the average score of all students taking the exam, Find the prediction interval for the score of the next student chosen at...
Q1a,
Q1b,
The average height of a group of student is 68 inches with a standard deviation of 3 inches. The average shoe size is in this same group is 11 with a standard deviation of 2. If the covariance between them is 3.732, what is the variance of Height - ShoeSize? 3 different type of grains are sold by a farmer. Let X1, X2 and X3 be the weight of each grain with means 100, 200, and 300 pounds...
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