A sports physiologist is investigating whether wearing copper-infused compression sleeves affects muscle recovery rates in competitive weightlifters. Although some commercial advertisements claim that these sleeves speed up recovery, the physiologist is not aware of any peer-reviewed scientific literature or prior research on the physiological effects of copper-infused textiles on recovery.

She recruits 40 weightlifters from local gyms. After a high-intensity training session, they are asked:

'Compared to your normal recovery, did wearing the copper-infused sleeve make your muscle recovery feel 'faster', 'slower', or 'the same'?'

The results are shown in Table 1.

Table 1: Responses of 40 weightlifters to the recovery question.