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BA215 Week 7 Assignment

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Question;1. To compare commuting times in;various locations, independent random samples were obtained from the six cities;presented in the ?Longest Commute to Work? graphic on page 255 in your;textbook. The samples were from workers who commute to work during the 8:00;a.m. rush hour. One-way Travel to Work in Minutes;Atlanta;Boston;Dallas;Philadelphia;Seattle;St.;Louis;29;18;42;29;30;15;21;37;25;20;23;24;20;27;26;33;31;42;15;25;32;37;39;23;37;32;20;42;14;33;26;34;26;18;48;35;a. Construct a graphic representation;of the data using six side-by-side dotplots.;b. Visually estimate the mean commute;time for each city and locate it with an X.;c. Does it appear that different cities;have different effects on the average amount of time spent by workers who;commute to work during the 8:00 a.m. rush hour? Explain.;d. Does it visually appear that;different cities have different effects on the variation in the amount of time;spent by workers who commute to work during the 8:00 a.m. rush hour? Explain.Part 2;a. Calculate the mean commute time for;each city depicted.;b. Does there seem to be a difference;among the mean one-way commute times for these six cities?;c. Calculate the standard deviation;for each city?s commute time.;d. Does there seem to be a difference;among the standard deviations between the one-way commute times for these six;cities?Part 3;a. Construct the 95% confidence;interval for the mean commute time for Atlanta and Boston.;b. Based on the confidence intervals;found does it appear that the mean commute time is the same or different for;these two cities (Atlanta and Boston). Explain;c. Construct the 95% confidence;interval for the mean commute time for Dallas.;d. Based on the confidence intervals;found in (Atlanta and Boston) and Dallas does it appear that the mean commute;time is the same or different for Boston and Dallas? Explain.;e. Based on the confidence levels;found in (Atlanta and Boston) and (Dallas) does it appear that the mean commute;time is the same or different for the set of three cities, Atlanta, Boston, and;Dallas? Explain;Question;2;2.Interstate 90 is the longest of the;east-west U.S. interstate highways with its 3,112 miles stretching from Boston;MA at I-93 on the eastern end to Seattle WA at the Kingdome on the western end.;It travels across 13 northern states, the number of miles and number of;intersections in each of those states is listed below.;State;No. of Inter;Miles;WA;57;298;ID;15;73;MT;83;558;WY;23;207;SD;61;412;MN;52;275;WI;40;188;IL;19;103;IN;21;157;OH;40;244;PA;14;47;NY;48;391;MA;18;159;a. Construct a scatter diagram of the;data.;b. Find the equation for the line of;best fit using x= miles and y=intersections.;c. Using the equation found in part;(b), estimate the average number of intersections per mile along I-90.;d. Find a 95% confidence interval for;?1.

 

Paper#62286 | Written in 18-Jul-2015

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