In a city with three high schools, all the ninth graders took a Standardized Test, with these results:High SchoolMean score on testNumber of ninth gradersGlenwoodCentral CityLincoln High779070mean of all ninth grader's scores =281343185The city's PR manager, who never took statistics, claimed the mean score of all ninth graders in the citywas 79. Of course, that is incorrect. What is the mean score for all ninth graders in the city? Round to onedecimal place.

For three high school, mean score on test and number of ninth graders is given.i.e n1=281, n2=343,…

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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cw2 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 75 288 Central City 96 304 Lincoln High 67 176 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? Mean of all ninth grader's scores = Round to 2 places
The mean purchase total is $93.80 and the median purchase total is $75.80. The store manager investigates and learns that the customer that made a $500 purchase had not purchased groceries, but rather a $500 gift card. Because this customer's purchase was not typical, the manager decides to exclude this total from the data set. How will removing the $500 purchase from the data set affect the value of the mean and the median?
Suppose you are interested in testing whether the mean earning of men in California differs significantly from the mean earning of men in New York. If the number of men from California in the sample is 123 and the number of men from New York in the sample is 88, how many degrees of freedom are there?
Students at Dover Community College have a mean credit card debt of $4,700 with a median of $2,900. Students at Ralton Community College have a mean credit card debt of $2,100 with a median of $1,900. Which of the following statements are true based on this information? There may be more than one correct answer. i. No more than half of Ralton students have debt more than $1,900. ii. The total debt of Ralton students is more than the total debt of Dover students. iii. The largest debt of the Ralton students is less than the largest debt of the Dover students. iv. About one-fourth of Ralton students have debt more than $2,100. v. Less than half of Dover students have debt more than $4,700.
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.
A teacher surveyed the students in one of his algebra classes, asking how many hours they spend watching TV shows, movies, and videos on a weekday. Their responses are given. Complete parts (a) through (e) below. 10 3 4 2 35 0 2 1 5 2 4 2 1 0 1 2 3 743 3 4 b. One student wrote "3-9." What value would represent this response well? Include the value in the sample for parts (c) through (d). A good value to represent the range 3-9 is c. Construct a dotplot. Choose the correct graph below. OA. TV, Movie, and Video Viewing Time O B. TV. Movie, and Video Viewing Time 02 4 8. 10 6. Hours 10 Hours OC. TV, Movie, and Video Viewing Time OD. TV. Movie, and Video Viewing Time 4. Hours 8 10 2 8. 10 C Hours d. What proportion of the observations are between 1 and 3 hours, inclusive? The proportion of the observations between 1 and 3 hours, inclusive is (Round to the nearest thousandth as needed) e. What proportion of the observations are less than 5 hours? Activate Windows Go to Settings to activate…
In a city with three high schools, all the ninth graders took a Standardized Test, with these results: Mean High Number of ninth Test School graders (Frequency) Score Glenwood 83 263 Central 94 323 Lincoln 70 184 The city's PR manager, who never took statistics, claimed the mean score of all ninth graders in the city was the average of 83, 94, and 70, which is 82.3. 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 =
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
B. The average exam score for 10 students in a statistics class was 85. One student dropped the class, changing the average exam score of the remaining students to 90. What was the exam score of the student who dropped the class?
Holiday Blues. A poll was conducted by Opinion Research Corporation to estimate the proportions of men and women who get the “holiday blues.” Identify the a. specied attribute.b. two populations.c. two population proportions.d. two sample proportions.e. According to the poll, 34% of men and 44% of women get the “holiday blues.” Are the proportions 0.34 and 0.44 sample proportions or population proportions? Explain your answer.
Cris Turlock owns and manages a small business in San Francisco, California. The business provides breakfast and brunch food, via carts parked along sidewalks, to people in the business district of the city. Being an experienced businessperson, Cris provides incentives for the salespeople operating the food carts. This year, she plans to offer monetary bonuses to her salespeople based on their individual mean daily sales. Her first task is to see if there is a significant difference in the mean daily sales among the different salespeople. She chooses a "sample" of days for each salesperson and records the sales for each day. She then runs a one-way, independent-samples ANOVA test to determine whether or not she can conclude that at least one salesperson's performances is significantly different from the others. (Otherwise, she'll split the bonuses evenly among all the salespeople.) In her ANOVA, the "groups" are the different salespeople, and the variable of interest is the daily sales…
A professor has twelve students in her class. Her class took a test with the following results: 73, 55, 72, 98, 77, 93, 58, 78, 79, 95, 96, 86 a. What was the mean grade on the test? (Simplify your answer and round to one decimal place.) b. What was the median grade on the test? (Simplify your answer and round to one decimal place.) C c. What was the mode? If there are no modes, enter “NONE”. Otherwise, enter the mode (or modes, separated by a comma). Mode(s) = $ Mean = 5 4 I Median = JO D f V % 5 t 6.0 b 6 Oll y h & 7 n u - * 00 8 m ( 9 k S O n L O A р alt 7 + [ // ctri

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