only question 3 complete than rating helpful 2) The operations manager of a plant that manufactures tires wants to compare the actual innerdiameters of two grades of tires, each of which is expected to be 575 millimeters. A sampleof five tires of each grade was selected, and the results representing the inner diameters ofthe tires, ranked from smallest to largest, are as follows:Grade X568 570 575 578 584Grade Y573 574 575 577 578a) For each of the two grades of tires, compute the mean, median, and standard deviation.b) Which grade of tire is providing better quality? Explain.c) What would be the effect on your answers in (a) and (b) if the last value for grade Ywere 588 instead of 578? Explain.3) The file contains the overall miles per gallon (MPG) of 2010 family sedans:24 21 22 23 24 34 34 34 20 20 22 22 44 32 20 20 22 20 39 20Source: Data extracted from "Vehicle Ratings," Consumer Reports, April 2010, p. 29.a) Compute the mean, median, and mode.b) Compute the variance, standard deviation, and range.c) Are the data skewed? If so, how?4) The file contains the cost (in cents) per 1-ounce serving for a sample of 13 chocolate chipcookies. The data are as follows:54 22 25 23 36 43 7 43 25 47 24 45 44Source: Data extracted from "Chip, Chip, Hooray," Consumer Reports, June 2009, p. 7.a) Compute the mean, median, and mode.b) Compute the variance, standard deviation, and range. Are there any outliers?Explain.c) Are the data skewed? If so, how?d) Based on the results of (a) through (c), what conclusions can you reach concerningthe cost of chocolate chip cookies?

Given that the overall miles per gallon (MPG) of 2010 family sedans: 24 21 22 23 24 34 34 34 20 20…

Answered: 3) The file contains the overall miles…

Algebra & Trigonometry with Analytic Geometry

13th Edition

ISBN:9781133382119

Author:Swokowski

Publisher:Swokowski

Chapter10: Sequences, Series, And Probability

Section10.7: Distinguishable Permutations And Combinations

Problem 15E

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for a sample of 9 automobiles, the mileage (in 1000s of miles) at which the original front brake pads were worn to 10% of their original thickness was measured, as was the mileage at which the original rear brake pads were worn to 10% of their original thickness. The results were as follows: Car Rear Front 1 41.2 32.2 2 36.3 27.2 3 45.8 34.7 4 46.6 37.3 5 39.6 30.7 6 52.3 40.5 7 51.7 41.0 8 46.3 33.8 9 47.4 36.8 a)Construct a 99.8% confidence interval for the difference in mean lifetime between the front and rear brake pads. Let d represent the mileage of the rear pads minus the mileage of the front ones. Round the answers to at least two decimal places. b)Because the confidence interval (contains/does not contain) values above 10 (in 1000s of miles), it (contradicts/does not contradict) the claim that the mean lifetime for rear brake pads is more than 10,000 miles more than the mean lifetime for front brake pads.
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An agent for a property management company would like to be able to predict the monthly rental cost for apartments based on the size of the apartment as defined by square footage. A sample of the rent of 25 apartments in a college rental neighborhood was selected, and the information collected revealed the following: Apartment Size (Sq. Ft.) Monthly Rent ($) 1 850 950 2 1,450 1,600 3 1,085 1,200 4 1,232 1,500 5 718 950 6 1,485 1,700 7 1,136 1,650 8 726 935 9 700 875 10 956 1,150 11 1,100 1,400 12 1,285 1,650 13 1,985 2,300 14 1,369 1,800 15 1,175 1,400 16 1,225 1,450 17 1,245 1,100 18 1,259 1,700 19 1,150 1,200 20 896 1,150 21 1,361 1,600 22 1,040 1,650 23 755 1,200 24 1,000 800 25 1,200 1,750 i) Determine a 95% interval estimate for the average rent of apartments with 1000…
The blood lead concentrations, in micrograms per deciliter (µg/dL), of 20 children from two different neighborhoods were measured. The results are recorded in the table. Neighborhood 1 3.97 3.92 3.99 3.71 4.13 3.97 4.02 3.88 4.12 3.70 3.96 3.78 4.30 4.09 4.13 4.94 3.93 3.95 3.86 3.83 Neighborhood 2 4.32 4.23 3.78 4.10 4.35 4.21 4.36 4.21 4.02 4.05 4.29 4.12 4.59 4.12 4.02 3.85 3.97 4.28 4.39 4.14 Using the same scale, draw a box-and-whisker plot for each of the two data sets, placing the second plot below the first. Considering that high blood lead concentrations are harmful to humans, in which of the two neighborhoods would you prefer to live? neighborhood1 or neighborhood 2

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