Elsa has taken two exams in Mathematics in Modern World. She got 80 on her first exam, for whichthe standard deviation was 7 and the mean of all scores was 75. She scored 65 on the second exam forwhich the mean of all scores was 40 and the standard deviation was 10._8. What is Elsa's z-score on her first exam?C. 0.7D. 0.6A. 0.5B. 0.49. What is Elsa's z-score on her second exam?A. 0.5C. 2.0B. 1.0D. 2.510. In comparison to the other students, where did Elsa do better?C. Both examsA. First ExamB. Second ExamD. Connot be solved

Z score can be found by following formula z=x-xσHere z mean z score x mean observed value x mean…

Answered: Elsa has taken two exams in Mathematics…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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Linda is in her first semester at a university and is taking a calculus course with a large enrollment. She just took the first midterm exam and is nervous about her score, which was 68. Among all the students in the course, the mean of the exam was 79 with a standard deviation of 15. Find the =-score of Linda's exam score relative to the exam scores among all the students in the course. Round your answer to two decimal places.
When I need to determine which standard deviation would give the better grade, what if the z-score is negative such as -.8 and -.4. Wouldn't the .-4 score provide a better grade because it's closer to m=42? The oridinga score is 38 and the mean is 42 but there are two standard deviation scores of 5 (answer was -.8) and 10 (answer was -.4) and I need to decide which one give the better grade.
I wanted to test if the mean Exam 3 score in this course was different than the mean Exam 2 score. To conduct this test I used the 30 students in my course last semester as my sample. I first calculated the difference in scores between Exam 2 and Exam 3 ("Exam 2 score - Exam 3 score"). The sample mean of these differences is 2.0 and the sample standard deviation of the differences is 3.0. What is your decision for this test? Group of answer choices 1. Reject the null hypothesis 2. Retain the null hypothesis
The sum of the deviation for the values * .35, 45, 30, 35, 40, and 25 is Zero True False
A large chemistry course took their final exam. The mean was 75 with a standard deviation of 8. What are the exam scores that separate the top and bottom 5 percent of the class (extreme 10%)? What are the exams scores that separate the middle 10% of the class (5% on each side of the mean)? What proportion of people scored in the A range (90 or above)? What proportion of people failed the exam (60 or belo
The average ACT score last time was 28.5. This time we believe the average will increase. We sample 49 students and find the average ACT score is 29.5. The population standard deviation is 5. What is the test- statistic? -1.40 1.40 .20 None of the other choices is correct -.20
The scores of students on a standardized test form a normal distribution with a mean of 300 and a standard deviation of 40. Using the fact that the middle 50% of the data falls within .67 standard deviations from the mean, find the lower and upper quartile scores for this test.
Konstantinos participates in a bowling league each summer and again each autumn. In Summer 2021, his mean score for the year was 160. For the whole league, the mean score was 158 with a standard deviation of 6. For Autumn 2021, his mean score was 164. The mean for the entire Autumn league was 160 with a standard deviation of 4.5. In which league (summer or autumn) did Konstantinos perform better relative to his peers? please explain your response and round any numeric answers to three (3) decimal places
Suppose X ~ N(6, 2). What value of x is two standard deviations to the right of the mean?
Word-e and Talk2U are two social media apps in which users can post messages in text. The character counts for posts on Word-e have a population mean of 96 and a standard deviation of 15. The character counts for posts on Talk2u have a population mean of 355 and a standard deviation of 39. For each.app, the distribution of the character counts is clearly bell-shaped Trey's last post on Word-e was 145 characters. Ryan's last post on Talk2U was 251 characters. (a) Find the z-scores of Trey's last post as a post on Word-e and Ryan's last post as a post on Talk2U. Round your answers to two decimal places. z-score of Trey's post: z-score of Ryan's post: (b) Relative to its population, which post was shorter? Choose the best answer based on the z-scores of the two posts. O Trey's post O Ryan's post O It is unclear which post was shorter relative to its population Explanation X X 5 Ⓒ2022 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | Accessibility P B
The actual value of the standard deviation can be zero or a positive number, why value can never be a negative number?

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