StudentFirstexamgrade XSecondexamgrade YD=Y-X1382326828-15NOTE: EX2=30775,-40H*3404146517061716105060756688127074944055510ΣΥ=34560,ΣΧΥ=31336a. Test at (a=0.05) if the mean grade of the first Statistics exam is above 50?b.Give 95% CI for the mean grades of the second Statistics exam?c. Compute the correlation coefficient between the first and the second exam grades?d. Test at (a=0.05) if the mean grades of the first and second Statistics exams are differernt?e. Give 95% CI for the difference in mean grades between the second and the first exams?10551570MeanSD54.3 11.971555.019.181.717.1

Given the data asStudentFirst exam grade XSecond exam grade…

Answered: Student First exam grade X Second 1 38…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Question 2 Save On a history test Patrick received a grade of 43 out of 50. The class mean was 35 with a standard deviation of 6. His girlfriend Kristin, in another section, received a grade of 87 out of 100. Her class mean was 75 with a standard deviation of 10. z-score for Patrick's grade (round to two decimal places) z-score for Kristin's grade = (round to two decimal places) Who received the higher grade relative to their respective classes? Why?
One of the z-score formulas will help on this question. Scores on the SAT test are normally distributed with a mean of 500 and standard deviation of 100 points. Pretend someone scored 400 on the math portion of the SAT test. What would be the z-score cut off for this score? A. 1.0 B. -1.0 C. 0 D. 2.0
please help!Find the standard deviation for the group of data items (Round to two decimal places as needed.) Stems Leaves 2 6 7 7 6 5 6 3 1 3 1 3
Use the data on student load. to test the claim that mean student load is more than 6.5 units. Use α = 0.10. Assume all requirements have been met. Student Unit Load 3, 12, 6, 9, 6, 12, 15, 12, 7, 9, 3 Test the claim that mean student load is more than 6.5 units. Use α = 0.10. Assume all requirements have been met.
@ 2 5. Using the following data set: 2,7,9, 1, 3, 5 Find the mean, standard deviation, and the standard error. (You are now combining lectures 3, 4, and 7.) F2 W S #3 80 F3 E D $ † 4 Q F4 R FL % 5 112 0 T G ^ 6 MacBook Air F6 Y H & 7 FEB 27 N F7 U * 8 ∞ J D F
The mean score for first exam in your first organic chemistry class (section A) was 60, with a standard deviation of 5. Your score on the exam was 70. A. How many standard deviations above the mean is your score?
Question 4
2?
The mean performance score of a large group of fifth-grade students on a math achievement test is 76. The scores are known to be normally distributed. What percentage of the students had scores more than 2.1 standard deviations above the mean? Click here for page 1 of the Areas under the Normal Curve Table Click here for page 2 of the Areas under the Normal Curve Table The percentage of the students that had scores more than 2.1 standard deviations above the mean is%. (Round to two decimal places as needed.)
QUESTION 12 You hypothesize that drinking water increases test scores so you design a study comparing test scores between people who drink water and people who do not drink water.You collect data on 62 people and find that in your sample there are 27 people who do not drink water and 35 people who drink water. The mean test score for non-water drinkers is 62 with a standard deviation of 13, while the mean score for those who drink water is 75 with 11 standard deviation. Above you have calculate the t-statistic and found the critical value of t. Based on this information, is the difference between your two means STATISTICALLY SIGNIFICANT? OYes, because the t-statistic value calculated was less than the critical value of t, indicting that p .05 O Yes, because the t-statistic value calculated was larger than the critical value of t, indicating that p .05

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