Scatterplot of daily cycling distances and type of climb: Everysummer, the touring company America by Bicycle conducts the “CrossCountry Challenge,” a 7-week bicycle journey across the UnitedStates from San Francisco, California, to Portsmouth, NewHampshire. At some point during the trip, the exhausted cyclistsusually start to complain that the organizers are purposelyplanning for days with lots of hill and mountain climbing tocoincide with longer distances. The tour staff counter that norelation exists between climbs and mileage and that the route isorganized based on practical issues, such as the location of townsin which riders can stay. The organizers who planned the route(these are the company owners who are not on the tour) say thatthey actually tried to reduce the mileage on the days with theworst climbs. Here are the approximate daily mileages and climbs(in vertical feet), as estimated from one rider’s bicyclecomputer.
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Mileage | Climb | Mileage | Climb | Mileage | Climb | 83 | 600 | 69 | 2500 | 102 | 2600 | 57 | 600 | 63 | 5100 | 103 | 1000 | 51 | 2000 | 66 | 4200 | 80 | 1000 | 76 | 8500 | 96 | 900 | 72 | 900 | 51 | 4600 | 124 | 600 | 68 | 900 | 91 | 800 | 104 | 600 | 107 | 1900 | 73 | 1000 | 52 | 1300 | 105 | 4000 | 55 | 2000 | 85 | 600 | 90 | 1600 | 72 | 2500 | 64 | 300 | 87 | 1100 | 108 | 3900 | 65 | 300 | 94 | 4000 | 118 | 300 | 108 | 4200 | 64 | 1500 | 65 | 1800 | 97 | 3500 | 84 | 1500 | 76 | 4100 | 91 | 3500 | 70 | 1500 | 66 | 1200 | 82 | 4500 | 80 | 5200 | 97 | 3200 | 77 | 1000 | 63 | 5200 | 92 | 3900 | 53 | 2500 | | |
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- Construct a scatterplot of the cycling data, putting mileage onthe x-axis. Be sure to label everything and include atitle.
- We haven’t yet learned to calculate inferential statistics onthese data, so we can’t estimate what’s really going on, but do youthink that the amount of vertical climb is related to a day’smileage? If yes, explain the relation in your own words. If no,explain why you think there is no relation.
- It turns out that inferential statistics do not support theexistence of a relation between these variables and that the staffseems to be the most accurate in their appraisal. Why do you thinkthe cyclists and organizers are wrong in opposite directions? Whatdoes this say about people’s biases and the need for data