The march 2007 issue of consumer reports presents data about airline maintenance. The following table presents the percentage of an airline's maintenance outsourced to other companies and the percentage of the airline's delays caused by the airlines:

airline. outsourced(%). Delays.

Alaska 92. 42

Hawain. 80 70

Us Airways 77 24

Northwest 76 43

AmericanWest 76 39

Continental. 69. 20

jetblue 68 18

southwest 68 20

airtran 66 14

frontier 65 31

united 63 27

delta 48 26

American 46 26

ATA 18 29

a. What are the observational units in this table?

b. Produce and describe a scaterplot of percentage of delays vs. percentage out sourced.

c. is it reasonable to conclude there is a cause and effect relationship between these variables, based on these data? explain

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592 Topic 26: Graphical Displays of Association as 10 7 8 9 10 11 12 13 14 15 16 Student Letters CM 16 SN 13 BP 12 ZP 10 NP 14 DS 9 MS(1) 13 MS(2) CW GW 14 12 15 Points 27 22 25 32 24 11 21 27 19 25 c. Produce a scatterplot of points vs. letters. Does the scatterplot reveal a tendency for students with longer names to have more Scrabble points? Explain. d. Identify the two students (by ID number) whose point totals are much larger than expected for the number of letters in their name. Is one of these expected based on the student's initials? e. Is it the case that every student with a longer name than another student has more Scrabble points? If not, identify a pair for which the student with the shorter name has more points. f. Describe the direction, strength, and form of the association between name length and Scrabble points. g. Create a new variable: ratio of points to letters. Produce a dotplot and summary statistics of this variable. Write a paragraph describing the distribution of this ratio variable for these the distribu students. h. Produce a scatterplot to examine whether there is a relationship between ratio and number of letters. Then do the same for number of Scrabble points and ratio. Summarize what you find. Exercise 26-33: Airline Maintenance The March 2007 issue of Consumer Reports presents data about airline maintenance. The following table presents the percentage of an airline's maintenance outsourced to other companies and the percentage of the airline's delays caused by the airline: Airline Alaska Hawaiian US Airways Northwest America West Continental JetBlue Southwest AirTran Frontier United Delta American ATA Outsourced (%) 92 80 77 76 76 69 68 68 66 65 63 48 46 18 Delays (%) 42 70 24 43 39 20 18 20 14 31 27 26 26 19 a. What are the observational units in this table? b. Produce and describe a scatterplot of percenge of delays vs. percentage outsourced. c. Is it reasonable to conclude there is a cause and-effect relationship between these variables, based on these data? Explain. Exercise 26-34: On Your Own Think of an issue of interest to you that concerns the relationship between two quantitative variables. Describe the issue and a research question of your choosing. Also, clearly identify the observational units and the two quantitative variables. TO 592 Topic 26: Graphical Displays of Association as 10 7 8 9 10 11 12 13 14 15 16 Student Letters CM 16 SN 13 BP 12 ZP 10 NP 14 DS 9 MS(1) 13 MS(2) CW GW 14 12 15 Points 27 22 25 32 24 11 21 27 19 25 c. Produce a scatterplot of points vs. letters. Does the scatterplot reveal a tendency for students with longer names to have more Scrabble points? Explain. d. Identify the two students (by ID number) whose point totals are much larger than expected for the number of letters in their name. Is one of these expected based on the student's initials? e. Is it the case that every student with a longer name than another student has more Scrabble points? If not, identify a pair for which the student with the shorter name has more points. f. Describe the direction, strength, and form of the association between name length and Scrabble points. g. Create a new variable: ratio of points to letters. Produce a dotplot and summary statistics of this variable. Write a paragraph describing the distribution of this ratio variable for these the distribu students. h. Produce a scatterplot to examine whether there is a relationship between ratio and number of letters. Then do the same for number of Scrabble points and ratio. Summarize what you find. Exercise 26-33: Airline Maintenance The March 2007 issue of Consumer Reports presents data about airline maintenance. The following table presents the percentage of an airline's maintenance outsourced to other companies and the percentage of the airline's delays caused by the airline: Airline Alaska Hawaiian US Airways Northwest America West Continental JetBlue Southwest AirTran Frontier United Delta American ATA Outsourced (%) 92 80 77 76 76 69 68 68 66 65 63 48 46 18 Delays (%) 42 70 24 43 39 20 18 20 14 31 27 26 26 19 a. What are the observational units in this table? b. Produce and describe a scatterplot of percenge of delays vs. percentage outsourced. c. Is it reasonable to conclude there is a cause and-effect relationship between these variables, based on these data? Explain. Exercise 26-34: On Your Own Think of an issue of interest to you that concerns the relationship between two quantitative variables. Describe the issue and a research question of your choosing. Also, clearly identify the observational units and the two quantitative variables. TO

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TOI Exercise 2633 Airline Maintenance Letters CM 16 27 8 outsourced to other companies and the of the airlines delays caus Show transcribed image text ... View the full answer