Homework Answers
Add Answer to:
6. Math instructors are not only interested in how their students do on exams, on average,...
You are interested in whether students that have a male instructors perform differently on exams. To...
You are interested in whether students that have a male instructors perform differently on exams. To investigate this, you gather a sample of 5 students that have a male instructor and compare their exam average to the average of all instructors. The data are below: Male Instructors All Instructors x ̅=74.5 µ=76.8 s = 7.62 Do you reject or fail to reject your null hypothesis? Reject the null hypothesis Fail to reject the null hypothesis
6. (11 marks). Students sometimes compare different instructors teaching the same course and claim that one...
6. (11 marks). Students sometimes compare different instructors teaching the same course and claim that one instructor is harder than another. The Department of Mathematics at the University of Kazoo decided to test this claim. They asked two different calculus instructors, Dr. Reimann and Dr. Poincaire, to prepare final exams and 20 volunteer students who had already passed calculus with other instructors to write both exams (one in the morning and one in the afternoon). The students grades were then...
11. Below is some data about two students who took the same exams as weliras the...
11. Below is some data about two students who took the same exams as weliras the class mean and standard deviation for these exams. Both girls are language majors. French Exam Spanish Exam Anna 83 83 Megan 177 95 X 81 74 15 a. To qualify for language honors, a major must maintain at least an 85 average for all language courses taken. So far, which student qualifies? b. Which student's overall performance was better?
Exercise 4 Suppose students in Stat 400 are interested in the average score of midterm 3,...
Exercise 4 Suppose students in Stat 400 are interested in the average score of midterm 3, but only a random sample of 17 exams have been graded so far. The instructor states that a 70% confidence interval for the true mean is given by (65, 88). You can assume the grades follow a normal distribution. Using only this information, calculate the following: a. (0.5 pts) X, b. (0.5 pts) s, C. (0.5 pts) a 95% confidence interval for u, the...
A random sampling of the IQ level of 100 students from Texas A&M and 100 students...
A random sampling of the IQ level of 100 students from Texas A&M and 100 students from Harvard results in the following two-sided confidence intervals at a 95% confidence level: Texas A&M students 130 < μ <140 Harvard students 110 < μ <120 Is it possible that the true average IQ of Harvard students is greater than the average IQ of Texas A&M students? True False QUESTION 2 An instructor of an extremely large class (1000 students) starts grading an...
4. Suppose that 75% of the students in a large class know how to answer a...
4. Suppose that 75% of the students in a large class know how to answer a particular test question correctly. You take a random sample of n = 5 student exams from the class. (a) What is the probability that none of the 5 students answered the test question correctly? (b) If the instructor gives no partial credit. 4 points for a correct answer and 0 points for an incorrect answer, i. What are the mean and standard deviation of...
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...
Let us suppose that a certain probability instructor manages, with probability 1, to write exams that...
Let us suppose that a certain probability instructor manages, with probability 1, to write exams that have mean 6565 and standard deviation 1313. The instructor is teaching two classes, one of size 100 and the other of size 25, and is about to give an exam to both classes. (a) Approximate the probability that the average test score in the class of size 100 exceeds 70. Probability ≈≈ (b) Repeat part (a) for the class of size 25. Probability ≈≈...
please help me do this Final exam scores in a Math class with large number of...
please help me do this
Final exam scores in a Math class with large number of students have mean 151 and standard deviation 4.1. Provided the scores of this Final exam have a nearly symmetric/bell-curve distribution, what percent of students score below 142.8 OR above 146.9 cal Enter a Points possible: 5 Unlimited attempts. Score on last attempt: 0. Score in gradebook: 0 Message instructor about this question more License
QUESTION 3 An instructor of an extremely large class (1000 students) starts grading an exam. After...
QUESTION 3 An instructor of an extremely large class (1000 students) starts grading an exam. After grading 100 of the assignments he calculates the sample average as 80 with a standard deviation of 10, He then correctly determines that he can 95% confident that the average student score is between 78.04 and 81.96. He continues grading, and after grading a total of 400 exams the sample average is 80 with a sample deviation of 20. How confident is he that...
6. (11 marks). Students sometimes compare different instructors teaching the same course and claim that one instructor is harder than another. The Department of Mathematics at the University of Kazoo decided to test this claim. They asked two different calculus instructors, Dr. Reimann and Dr. Poincaire, to prepare final exams and 20 volunteer students who had already passed calculus with other instructors to write both exams (one in the morning and one in the afternoon). The students grades were then...
11. Below is some data about two students who took the same exams as weliras the class mean and standard deviation for these exams. Both girls are language majors. French Exam Spanish Exam Anna 83 83 Megan 177 95 X 81 74 15 a. To qualify for language honors, a major must maintain at least an 85 average for all language courses taken. So far, which student qualifies? b. Which student's overall performance was better?
Exercise 4 Suppose students in Stat 400 are interested in the average score of midterm 3, but only a random sample of 17 exams have been graded so far. The instructor states that a 70% confidence interval for the true mean is given by (65, 88). You can assume the grades follow a normal distribution. Using only this information, calculate the following: a. (0.5 pts) X, b. (0.5 pts) s, C. (0.5 pts) a 95% confidence interval for u, the...
A random sampling of the IQ level of 100 students from Texas A&M and 100 students from Harvard results in the following two-sided confidence intervals at a 95% confidence level: Texas A&M students 130 < μ <140 Harvard students 110 < μ <120 Is it possible that the true average IQ of Harvard students is greater than the average IQ of Texas A&M students? True False QUESTION 2 An instructor of an extremely large class (1000 students) starts grading an...
4. Suppose that 75% of the students in a large class know how to answer a particular test question correctly. You take a random sample of n = 5 student exams from the class. (a) What is the probability that none of the 5 students answered the test question correctly? (b) If the instructor gives no partial credit. 4 points for a correct answer and 0 points for an incorrect answer, i. What are the mean and standard deviation of...
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...
please help me do this
Final exam scores in a Math class with large number of students have mean 151 and standard deviation 4.1. Provided the scores of this Final exam have a nearly symmetric/bell-curve distribution, what percent of students score below 142.8 OR above 146.9 cal Enter a Points possible: 5 Unlimited attempts. Score on last attempt: 0. Score in gradebook: 0 Message instructor about this question more License
QUESTION 3 An instructor of an extremely large class (1000 students) starts grading an exam. After grading 100 of the assignments he calculates the sample average as 80 with a standard deviation of 10, He then correctly determines that he can 95% confident that the average student score is between 78.04 and 81.96. He continues grading, and after grading a total of 400 exams the sample average is 80 with a sample deviation of 20. How confident is he that...
Most questions answered within 3 hours.
-
Vulcan Flyovers offers scenic overflights of Mount St. Helens,
the volcano in Washington State that explosively...
asked 42 seconds from now -
If organizations do not adapt fast enough and move incrementally
from the twentieth-century model to the...
asked 7 seconds ago -
A helium balloon with 2.5L of gas has a gauge pressure of 10,000
Pa. The balloon...
asked 4 minutes ago -
What is responsible for Jupiter's enormous magnetic field?
asked 19 minutes ago -
At the end of the year, a company offered to buy 5,000 units of
a product...
asked 21 minutes ago -
Implement C++ program for each of the following.
Let D = [-48, -14, -8, 0, 1,...
asked 41 minutes ago -
Consider a labor market in which LD = 400 – 4W and LS = 250 +...
asked 55 minutes ago -
Let’s say you are teaching a typically-developing young child
how to eat with a spoon. Describe...
asked 38 minutes ago -
Ask Your Teacher A toy gun uses a spring to project a 5.6-g soft
rubber sphere...
asked 50 minutes ago -
*****DO NOT ANSWER THIS QUESTION IF YOU DON'T
KNOW*******
Question - PERSONAL DEVELOPMENT ESSAY and Detailed...
asked 57 minutes ago -
A certain rifle bullet has a mass of 5.25 g. Calculate the de
Broglie wavelength of...
asked 1 hour ago -
Research new software products that assist in project
communication management. Write a paper summarizing your findings,...
asked 1 hour ago