28) Suppose the scores on an exam have a mean of 75 with a standard deviation of 8. If one student has a test result with aZ-score of -1.5, and a second student has a test result with a z-score of 2.0, how many points higher was the secondstudent's result than that of the first?(A) 3.5(B) 4(C) 12(D) 16(E) 2829) A national achievement test is administered annually to 3rd graders. The test has a mean score of 100 and a standarddeviation of 15. If Jane's z-score is 1.20, what was her score on the test?(A) 82(B) 88(C) 100(D) 112(E) 11830) An advantage to using surveys as opposed to experiments is that(A) surveys are generally cheaper to conduct.(B) it is generally easier to conclude cause and effect from surveys.(C) surveys are generally not subject to bias.(D) surveys involve use of randomization.(E) surveys can make use of stratification.31) Suppose X and Y are independent random variables. The variance of X is equal to 16; and the variance of Y is equalto 9. Let Z-X - Y. What is the standard deviation of Z?(B) 5.00(A) 2.65(E) It is not possible to answer this question, based on the information given.(C) 7.00(D) 25.032) A company wishes to survey what people think about a new product it plans to market. They decide to randomlysample from their customer database as this includes phone numbers and addresses. This procedure is an example ofwhich type of sampling?(A) Cluster(B) Convenience(C) Simple random(D) Stratified(E) Systematic33) The back-to-back stemplot on the right shows the number of books read in ayear by a random sample of college and high school students. Which of thefollowing statements are true?CollegeHigh schoolI. One college student read seven books.II. The college median is equal to the high school median.III. The mean is greater than the median in both groups.70366 100351234 2 124466889 31 8928 4 01(A) I only(B) Il only(C) I and III only(D) II and III only(E) I, II, and II53 734) A bank wishes to survey its customers. The decision is made to randomly pick ten customers who just have checkingaccounts, ten customers who just have savings accounts, and ten customers who have both checking and savings accounts.This procedure is an example of which type of sampling?(A) Cluster(B) Convenience(C) Simple random(D) Stratified(E) Systematic35) Two antidepressants are to be compared in the treatment of elderly patients in a nursing home. Each patient has his orher own room, some with spectacular views of the ocean. The experimental design is to create homogeneous blocks withrespect to window view. How should randomization be used for a randomized block design?(A) Within each block, randomly pick half the patients to receive each antidepressant.(B) Randomly pick half of all patients to receive cach antidepressant, but then analyze the results separately by blocks.(C) Randomly choose which blocks will receive which antidepressants.(D) Randomly choose half the blocks to receive each antidepressant for a given time period; then for the same time periodswitch the medication in each block and compare the results.(E) For ethical reasons, allow patients to choose which medication they prefer taking, but them randomly assign patientsto the blocks.36) Which of the following statements is incorrect?(A) Voluntary response samples often underrepresent people with strong opinions.

Given that. X~N( μ , ?^2 ) Z-score =( x - μ )/? NOTE:- According to bartleby guidelines expert…

Answered: 28) Suppose the scores on an exam have…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

a sample of n=300 male college freshmen has a mean weight of 160 with a standard devation of 11. how many of the 300 observed weights fall within (A)2 standard deviations of the mean? (B) 3 standard deviations of the mean? (C) 5/2 deviations of the mean? Show the interval in each case.
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.
Suppose the scores of students on an exam are Normally distributed with a mean of 522 and a standard deviation of 83. Then approximately 99.7% of the exam scores lie between the numbers such that the mean is halfway between these two integers. and ☐
Suppose the mean and standard deviation of the GPAs at Tulane are Xbar = 2.899; and s = -0.753Charlie's GPA has a z-score of -0.140. What is Charlie's GPA?(Leave your answer to 2 decimals: ex: 1.23)
4. A distribution of scores has = 70. The z-score for X = 65 is computed and a value of z = +1.00. Regardless of the value of the standard deviation, why must this z-score be incorrect?
3. The average (or mean) amount of hours spent on social media per day is 2 hours and the standard deviation is 2 hours. Calculate the z scores for the following individual scores: Person 1 (X) = 1 hour, z = Person 2 (X) = 3 hours, z= Person 3 (X) = 4 hours, z=
Use the formula to find the standard error of the distribution of differences in sample means, ₁ - X₂. Samples of size 105 from Population 1 with mean 86 and standard deviation 13 and samples of size 80 from Population 2 with mean 73 and standard deviation 16 Round your answer for the standard error to two decimal places. standard error =
In Mr Samboko courses, the coeﬃcient of correlation between General biology I and General-biology II for 20 students is 0.3, Mean of General biology I and General-biology II are 15 and 20 respectively and also the standard deviation of General biology I and General-biology II are 4 and 5 respectively. At the time of calculation one item 27 has wrongly been taken as 17 for General biology I and 35 instead of 30 for General biology II. As a biostatistics student ﬁnd the correct coeﬃcient of correlation between General biology I and General-biology II for 20 students.
11. Ed had a mark of 75 out of 80 on a test, which had a mean mark of 60 and a standard deviation of 7.5. Sam had a mark of 78 out of 90 on a test, which had a mean mark of 66 and a standard deviation of 6.0. Statistically, who had the better mark compared to the rest of his class? A Ed had a better mark. B Sam had a better mark C You cannot tell who did better with the given information. D The two scores are statistically the same. 12. Anil received the following marks on his first five biology tests: 75, 84, 92, 61, and 79. What test score must Anil earn on his sixth test so that his mean mark for all six tests will be 80? 75+84 +92 +61 +79
Greg is in his first semester at a university and is taking a calculus course with a large enrollment. He just took the first midterm exam and is nervous about his score. Among all the students in the course, the mean of the exam was 85 with a standard deviation of 15.Find that grag has obtain less then 95.
Two groups of students took the same test. Group A is having a mean of 60 marks and a standard deviation of 5 markS. Group B is having a mean of 60 marks and a standard deviation of 10 marks. Which of the statements below is correct? A. Group A students have a wider spread in performance than that in group B B. Group B students have a wider spread in performance than that in group A C. Group A students have the same spread in performance than that in group B D. None of the above A
Suppose that a recent article by a historian stated that the mean time spent in jail by a first–timeconvicted burglar in the 20th century was 2.5 years. A study was then done to see if the mean time has increasedin the new century. A random sample of 26 first-time convicted burglars in a recent year was picked. The meanlength of time in jail from the survey was 3 years. Suppose that it is somehow known that the population standarddeviation is 1.8 years and that the population is normally distributed.The hypotheses can then be framed as:H0 : μ = 2.5 vs. Ha : μ > 2.5(a) Which of the following figures (next page) best describes the p-value for this hypothesis testingproblem. Explain your reasoning. (numbers above red shaded area represent the corresponding probabilities). (b) Write the decision and conclusion for this hypothesis testing problem if the significance level, α,is 0.1.

SEE MORE QUESTIONS

Recommended textbooks for you

MATLAB: An Introduction with Applications

Statistics

ISBN:

9781119256830

Author:

Amos Gilat

Publisher:

John Wiley & Sons Inc

Probability and Statistics for Engineering and th…

Statistics

ISBN:

9781305251809

Author:

Jay L. Devore

Publisher:

Cengage Learning

Statistics for The Behavioral Sciences (MindTap C…

Statistics

ISBN:

9781305504912

Author:

Frederick J Gravetter, Larry B. Wallnau

Publisher:

Cengage Learning

MATLAB: An Introduction with Applications

Statistics

ISBN:

9781119256830

Author:

Amos Gilat

Publisher:

John Wiley & Sons Inc

Probability and Statistics for Engineering and th…

Statistics

ISBN:

9781305251809

Author:

Jay L. Devore

Publisher:

Cengage Learning

Statistics for The Behavioral Sciences (MindTap C…

Statistics

ISBN:

9781305504912

Author:

Frederick J Gravetter, Larry B. Wallnau

Publisher:

Cengage Learning

Elementary Statistics: Picturing the World (7th E…

Statistics

ISBN:

9780134683416

Author:

Ron Larson, Betsy Farber

Publisher:

PEARSON

The Basic Practice of Statistics

Statistics

ISBN:

9781319042578

Author:

David S. Moore, William I. Notz, Michael A. Fligner

Publisher:

W. H. Freeman

Introduction to the Practice of Statistics

Statistics

ISBN:

9781319013387

Author:

David S. Moore, George P. McCabe, Bruce A. Craig

Publisher:

W. H. Freeman

SEE MORE TEXTBOOKS