In a city with three high schools, all the ninth graders took a Standardized Test, with these results:High SchoolNumber of ninth graders (Frequency)Mean Test ScoreGlenwood77283Central94307Lincoln65170The city's PR manager, who never took statistics, claimed the mean score of all ninth graders in the citywas the average of 77, 94, and 65, which is 78.7. Of course, that is incorrect. What is the mean score forall ninth graders in the city? Round to one decimal place.Mean of all ninth grader's scores =

The table shows the mean test score and the number of ninth graders.

Answered: In a city with three high schools, all…

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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It is a branch of statistics that deals with data analysis and one of itstechnique is to “describe” data in symbolic form and abbreviated fashion.a. Inferential Statistics c. Descriptive Statisticsb. Statistics and Probability d. Probability
Suppose there are 5 students in a room. The mean age is 20.0 years, and the median age is 19. If the youngest person leaves and is not replaced by another person, what happens to the mean and the median? The mean either increases or stays the same, and the median increases. The median either increases or stays the same, and the mean increases. The mean increases, but it is impossible to determine whether the median increases, decreases, or stays the same.
1. The following were scores received by 20 Grade 8 students in a short quiz: 10, 9, 15, 20, 13.15, 18. 11. 7, 12, 15, 13, 18, 19,12, 8, 10, 13. 17, and 15. Find the mean, median, and mode. a. Mean 2. b. Median c. Mode
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 81 272 Central City Lincoln High The city's PR manager, who never took statistics, claimed the mean score of all ninth graders in the city was 81. Of course, that is incorrect. What is the mean score for all ninth graders in the city? Round to one decimal place. 93 303 69 158 mean of all ninth grader's scores =
In a city with three high schools, all the ninth graders took a Standardized Test, with these results: Number of ninth graders High School Mean score on test Glenwood 77 264 Central City Lincoln High 91 303 70 170 The city's PR manager, who never took statistics, claimed the mean score of all ninth graders in the city was 79.3. Of course, that is incorrect. What is the mean score for all ninth graders in the city? Round to one decimal place. mean of all ninth grader's scores =
Mai collects information about 37 classmates. She believes her data set is perfectly symmetrical with a mean and median of 20. She then realizes that the number she has recorded as 32 was actually supposed to be 42. What is true about the mean and median of her corrected data set? A: The mean and median of the corrected set are both still 20. B: The mean of the corrected data set is still 20, but the median is greater than 20. C: The median of the corrected data set is still 20, but the mean is greater than 20. D: The mean and median of the corrected set are both greater than 20.
The mean salary of twelve men is $57,000, and the mean salary of four women is $87,000. Find the mean salary of all sixteen people.
You saw back in Chapter 2 that the mean, median, mode, and midrange are used to indicate where data is centered in a data set, or in other words what a typical value in the set is. A question that is often asked is, "If they're all supposed to do the same thing, why is there more than one?" Isn't one enough? In this exercise, you will be given two small sets of data. For each set, a. find the mean, median, mode and midrange b. in your opinion, decide which of the measures BEST represents all the values in the set (best indicates a typical value), and which one does this the WORST. c. post your responses and justify them by explaining why Don't forget to respond to at least one of your classmate's posts. With this exercise, "more is better." I'll elaborate after the deadline. • Set A: the salaries of 10 employees at a company (in thousands of dollars): 50, 50, 50, 50, 50, 50, 50, 50, 50, 500 • Set B: the grades of 9 students on an exam: 20, 25, 30, 35, 40, 45, 100, 100, 100
Q6. The following scores represent the final examination grades for an elementary statistics course: 23,60,79,32,57,74,52,70,82,36,80,77,81,95,41,65,92,85,55,76,52,10,64,75,78,25,80,98,81,67,41,71,83,54,64,72,88,62,74,43,60,78,89,76,84,48,84,90,15,79,34,67,17,82, 69,74,63,80,85,61 (a) Construct a stem-and-leaf plot for the examination grades in which the stems are 1, 2, 3,..., 9. (b) Construct a relative frequency histogram, draw an estimate of the graph of the distribution, and discuss the skewness of the distribution. (c) Compute the sample mean, sample median, and sample standard deviation.
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The salaries of the employees at four companies are summarized below. Answer the questions about them. Company A: The range of salaries is $56 000 and the mean salary is $34 000. Company B: The range of salaries is $57 000 and the mean salary is $38 000. Company C: The range of salaries is $64 000 and the mean salary is $33 000. Company D: The range of salaries is $62 000 and the mean salary is $37 000. (a) Based on the information above, which company's salaries have the least variability? O Company A O Company B O Company C O Company D (b) Based on the information above, which company has the lowest salaries on average? O Company A O Company B O Company C O Company D
If a data set contains x values of 24, 37, 4, 17, 45, which x value can be used for interpolation?

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