BA215 Business Statics Assignment 7
ProfArgeol1. 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. Oneway 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 sidebyside 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 oneway 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 oneway 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 eastwest U.S. interstate highways with its 3,112 miles stretching from Boston, MA at I93 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 I90.
d. Find a 95% confidence interval for β_{1}.
 7 years ago
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BA215 Business Statics Assignment 7
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 …
8 years agoW7 Assignment Business Statistics Grantham University
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 …
8 years agoBA215 W7 Assignment : Grantham
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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 …
7 years agoSTATS To compare commuting times in various locations, independent random
NOT RATEDTo 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 …
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NOT RATED1. 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 …
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NOT RATEDTo 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 …
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NOT RATED1. 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 …
7 years agoTo 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
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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 …
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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 …7 years agoTo compare commuting times in various locations, independent random samples were obtained from the six
NOT RATEDTo compare commuting times in various locations, independent random samples were obtained from the six cities presented in the “Longest Commute to Work” graphic. The samples were from workers who …
7 years ago