An economist conducted a study of the possibleassociation between weekly income and weeklygrocery expenditures. The particular interest waswhether higher income would result in shoppersspending more on groceries. A random sample ofshoppers at a local supermarket was obtained, and aquestionnaire was administered asking about theweekly income of the shopper's family and thegrocery bill for that week. The graph below containsa scatterplot with a least-squares line.200180160140120100806040200020040060080010001200Weekly IncomeThe average income in the sample was $553. Basedon the least-squares line, the average grocery bill forthis sample was approximately:Weekly Grocery Bil

From the given graph we estimate the grocery bill.

Answered: An economist conducted a study of the…

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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An auctioneer of antique Iranian rugs kept records of his weekly auctions in order to determine the relationships among price, age of carpet or rug, number of people attending the auction, and the number of times the winning bidder had previously attended his auctions. He felt that, with this information, he could plan his auctions better, serve his steady customers better, and make a higher overall profit for himself. The results shown in the accompanying table were obtained.
In a poll, a random sample of 2163 adults aged 18 and over was asked, “When you see an ad emphasizing that a product is made in your country, are you likely to buy it, less likely to buy it, or neither more nor less likely to buy it?”. The results of the survey are presented in the side by side graph.
Jennie makes the first quartile salary for a construction worker. markos makes the first quartile salary for a receptionist who makes more money?
A Hong Kong snack-food vendor offers 3 types of boxed ”lunches to go,” priced at $3, $5, and $10, respectively. The vendor would like to establish whether there is a relationship between the price of the boxed lunch and the number of sales achieved per hour. Consequently, over a 15-day period the vendor records the number of sales made for each of the 3 types of boxed lunches. The following data show the boxed-lunch price (x) and the number sold (y) during each of the 15 lunch hours.(3, 7) (5, 5) (10, 2) (3, 9) (5, 6) (10, 5) (3, 6) (5, 6)(10, 1) (3, 10) (5, 7) (10, 4) (3, 5) (5, 6) (10, 4)Prepare a scatter plot of the points and comment on the relationship between the price of the boxed lunches and the numbers sold each lunchtime.
A study was conducted to detemine whether a the final grade of a student in an introductory psychology course is linearly related to his or her performance on the verbal ability test administered before college entrance. The verbal scores and final grades for 10 students are shown in the table below. Student Verbal Score x Final Grade y 1 37 43 2 38 46 3 33 39 4 57 67 5 60 74 6 64 80 7 47 59 8 66 76 9 28 30 10 53 62 Find the least squares line. ŷ = -2.89 + 1.2524 x Should the regression be used to predict the final grade of a student with a verbal score of 100? answer: ?
An auctioneer of antique Iranian rugs kept records of his weekly auctions in order to determine the relationships among price, age of carpet or rug, number of people attending the auction, and the number of times the winning bidder had previously attended his auctions. He felt that, with this information, he could plan his auctions better, serve his steady customers better, and make a higher overall profit for himself.
Determine the best (according to sum-of-squares-measure) curve y = ax + b, through thedata below.
Suppose that a researcher is interested in the average standardized test score for fifth graders in a local school district. The fifth graders at a specific school would comprise a ___________ and their average test score would be a ___________.
The Greer Tire company manufactures a new steel-belted radial tire to be sold through a national chain of discount stores. Because the tire is a new product, Greer’s managers believe that the mileage guarantee offered with the tire will be an important factor in the acceptance of the product. Let X = miles that the tires last: X~N(60,000 2,500) Find the mileage guarantee that ensures this company will repair no more than 15% of its product for free. Assume the distribution of tire mileage is normal.
The following data represent the net profits made by a sample of 25 companies that operate in real-state sector. 56 97 78 61 79 93 84 76 58 92 89 96 42 44 85 77 53 88 62 84 62 82 75 95 89 Choose the best graphical presentation and justify your Based on your answer in (1), construct the selected graphical presentation and comment on the Based on your answer in (2), do you think the sector performance is satisfactory? Justify your answer.
Determine the best (according to sum-of-squares-measure) curve y = ax2 + bx + c, throughthe data above.
Researchers asked each child in a sample of 411 school-age children if they were more or less likely to purchase a lottery ticket at a store if lottery tickets were visible on the counter. The percentage that said that they were more likely to purchase a ticket by grade level are as follows: Grade Percentage that said theywere more likely to purchase 6 32.4 8 46.8 10 74.7 12 83.5 Find the equation of the least-squares line, where y = percentage who said they were more likely to purchase and x = grade. (Give the answer to two decimal places.) =

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