A detection device is used to monitor the level of carbon monoxide (CO) in the air. The following data, in ppm (parts per million) were collected from a single location inside a recreation facility: 7.28 8.50 6.98 5.56 9.13 7.34 5.56 7.98 8.18 8.69 4.03 9.05 This data is also on Statcrunch under the group data as, Carbon Monoxide (CO) in the air. Questions: a) Identify the variable in this data.

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