Census ProjectAmong the data theUS Census bureauNumber of people inNumber ofNumber of peoplehouseholdhouseholds131,886,79438,635,17018,044,52915,030,3506,940,5082,704,8731,749,501collects are the sizesof households, asshown in the table6.7 or moreN345 d)Find the approximate variance for the population.d)_e)Find the approximate Standard Deviation for the population.e)_

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Answered: d) Find the approximate variance for…

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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We are interested in determining whether or not the variances of the sales at two music stores (A and B) are equal. A sample of 16 days of sales at store A has a sample variance of 20 while a sample of 26 days of sales from store B has a sample variance of 30. The test statistic is
Part I A bakery sells homemade bread by the loaf and sales are uniformly distributed between 200 and 600 loaves per day. a. Find the probability of selling 240 loaves on a given day. b. Find the probability of selling between 250 and 260 loaves per day Part II The golf balls produced by TruGolf have a mean distance of 250 meters and a variance of 625 meters. c. How large a sample of TruGolf balls should be taken if they want to estimate with 90% confidence the mean distance to within 8 meters? d A random sample of 40 balls from TruGolf are selected. Find the Bound of Error when the confidence level is 95% for TruGolf
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How many F ratios are figured in a two-way analysis of variance? 1 2 3 as many as there are cells in the design
3. Can SAT scores predict college performance? Let x be a variable that represents SAT score of a computer science major, and let y be a variable that represents a student’s GPA upon graduation. A random sample of n =15 computer science majors provided their SAT scores and GPAs: x 1232 1070 1086 1287 1130 1048 1121 1095 1135 1208 1333 1160 1186 1243 1261 y 3.52 2.91 2.4 3.47 3.47 2.37 2.4 2.24 3.02 3.32 3.59 2.54 3.19 3.71 3.58 The scatter diagram for the SAT score and GPA is given below: (a) Find the sample correlation coefficient r. Truncate to two decimal places. What does the value tell you about the data? (b) Find the equation of the least squares line . Truncate to four decimal places. What does the slope mean? (c) Find the value of the coefficient of determination . Truncate to two decimal places. What does this number mean? (d) What is the predicted GPA if a computer science major got a…
3. Complete the first 3 columns of the table below. Values Deviations Square deviations X X - X (X-X)² Standard (z) scores X-X Z = a. Compute the sample variance and sample standard deviation by definition. b. Fill in the last column of the table c. Compute the coefficient of variation.
Let the degree of freedom of treatment be df1 and error be df2. Based on the figure, which is the correct combination of (df1,df2)? SUMMARY Groups Count Sum Average Variance Column 1 231 46.2 34.2 Column 2 200 40 2.5 Column 3 232 46.4 44.3 Column 4 168 33.6 20.3 A. (2,12) В. (2, 16) С. (4, 16) D. (3, 16) A. D Answer B.
A Hollywood studio believes that a movie that is considered a drama will draw a larger crowd on average than a movie that is considered a comedy. To test this theory, the studio randomly selects several movies that are classified as dramas and several movies that are classified as comedies and determines the box office revenue for each movie. The results of the survey are as follows. Assume that the population variances are approximately equal. Box Office Revenues (Millions of Dollars) n x S Drama 14 150 50 Comedy 16 120 10 Copy Data Calculate a 99 % confidence interval for the difference in mean revenue at the box office for drama and comedy movies. Let dramas be Population 1 and comedies be Population 2. Write your answer using interval notation and round the interval endpoints to two decimal places.
Consider the five-product line produce products with the same weight (grams). Test the hypothesis of equal variances of five product line? Line A Line B Line C Line D Line E 250 310 250 340 250 260 330 230 270 240 230 280 220 300 270 270 360 260 320 290

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d) Find the approximate variance for the population. d).