4. Polly takes three standardized tests. She scores 600 on all three. Rank herperformance on the three tests from best to worst if the means and standarddeviations for the tests are as follows:MeanStandard DeviationTest I50080Test II470120Test III56030(a) III, II, and I(b) I, III, and I|(c) III, I and II(d) II, I, and III

Solution: 4. The mean and standard deviation for the test I are 500 and 80. The mean and standard…

Answered: 4. Polly takes three standardized…

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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The City University of New York/BMCC Department of Mathematics Math 150 Mid-Term #1. Fall 2021 Last Name: First Name: Please answer any 5 questions. If you answer more than 5, all the questions that you answer shall be evaluated, but only the best 5 will count. All questions carry equal weight. Please write legibly in the spaces provided. Pat took three exams. In Mathematics, her grade was 75, the mean was 90, and the standard deviation was 15. In Physics, her grade corresponded to a Z-Score of -1.25. In Latin, her grade was 73 and the average was also 73. 1. (i). In which class is Pat's relative position strongest? (ii). In which class was Pat's relative position weakest? 2. Find the correlation coefficient, r, for the sample data below (please round your final answer to 3 digits after the decimal): Y
4. For the following data, find the sample variance and sample standard deviation: -6, 6, 6, 0, -6, 6, 10
can i please get the answers to 40,41 and 42?
Yessica thought that there was a correlation between the amount of time students slept the evening before their final exam and their final exam grade. She took an SRS of 5 students in her class and recorded the sleep time the evening before their final exam, and their final exam score. Let the sleep time the evening before the final exam represents the explanatory variable, and the final exam score be the response variable. Below is a sample data set. 1 2 r = x (hour) 6 8 5 7 6 3 4 5 Calculate the sample correlation coefficient (r) to three decimal places. Why would we expect the correlation coefficient to be positive? O There is no change in exam score to sleep time O As the sleep time increases, exam score increases As the sleep time decreases, exam score increases As the sleep time increases, exam score decreases y (score) 72 100 62 87 73
hwd 1.1 In a city with three high schools, all the ninth graders took a Standardized Test, with these results: High School Mean score on test Number of ninth graders Glenwood 84 270 Central City 92 349 Lincoln High 68 154 The city's PR manager, who never took statistics, claimed the mean score of all ninth graders in the city was 81.3 . Of course, that is incorrect. What is the mean score for all ninth graders in the city? Mean of all ninth grader's scores = Round to 2 places
Listed below are the top 10 annual salaries (in millions of dollars) of TV personalities. Find the range, variance, and standard deviation for the sample data. Given that these are the top 10 salaries, do we know anything about the variation of salaries of TV personalities in general? 42 41 39 31 23 21 18 17 16.8 16.1 O The range of the sample data is $ million. (Type an integer or a decimal.) The variance of the sample data is (Round to two decimal places as needed.) The standard deviation of the sample data is $ (Round to two decimal places as needed.) million Is the standard deviation of the sample a good estimate of the variation of salaries of TV personalities in general? O A. No, because there is an outlier in the sample data. B. Yes, because the sample is random. C. No, because the sample is not representative of the whole population. O D. Yes, because the standard deviation is an unbiased estimator. Next
3. The amount of time (in minutes) it took each individual in a sample of athletes to run a mile was recorded. In this particular sample, most of the athletes were able to run the mile quickly, but there were a small number of athletes who were not fast runners and needed more time to complete the mile. Two measures of center were computed for this sample: 12.9 minutes and 9.5 minutes. One of these measures is the mean and one is the median. Which measure must be the mean? A. The mean is 9.5 minutes because the distribution of running times would be skewed to the left. B. The mean is 9.5 minutes because the distribution of running times would be skewed to the right. c. The mean is 12.9 minutes because the distribution of running times would be skewed to the left. D. The mean is 12.9 minutes because the distribution running times would be skewed to the right.
Which has the greatest standard error? mean=20, s.d.=10, n=9 mean=30, s.d.=15, n=16 mean=40, s.d.=20, n=25 mean=50, s.d.=25, n=36
National park services, a bureau of the US government responsible for park management, is interested in how the scores of their park rangers today are better or worse than in the past. The cognitive test that the forest rangers take as remained the same over the last five years. Below are the scores for each year, compute the mean, median, mode, range, and standard deviation for each year. Current Year 56, 45, 64, 75, 87, 81, 69, 81, 58, 92, 99, 95, 75, 92, 73, 83, 47, 69, 57, 74, 62, 74, 73, 100, 83 Five Years Ago 66, 78, 75, 79, 59, 74, 55, 89, 55, 79, 68, 27, 69, 95, 68, 90, 65, 79, 69, 79, 87, 86, 98, 81, 96
The question is, for the following scores find the mean, median, sum of squared deviations, variance, and standard deviation. 2,2,0,5,1,4,1,3,0,,0,1,4,,4,0,1,,4,3,4,2,1,0. Tnank you!
Find the range, variance and standard deviation of the ff 10, 17, 15, 20, 13, 11, 19, 12, 14, 16 Excel form need
The college physical education department offered an advanced first aid course last summer. The scores on the comprehensive final exam were normally distributed, and the z-scores for some of the students are shown below. Robert 1.24 Juan 1.66 Haley −1.84 Joel 0.00 Jan −0.84 Linda 1.68 Which of these students scored above the mean? (Select all that apply.) Which of these students scored on the mean? (Select all that apply.) Which of these students scored below the mean? (Select all that apply.) If the mean score was μ = 140 with standard deviation σ = 15, what was the final exam score for each student?

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