figure 2.4 Frequency table showing causes of blunt injury to limbs in 75 patients, taken from a study of the treatment Of pain after limb injury. Source: Data from Rainer et al. (2000). Satisfaction with nursing care Very satisfied Satisfied Dissatisfied Very dissatisfied Number of patients (n 475) 90 51 52 Figure 2.5 frequency table for data on level of satisfaction with nursing care by 475 psychiatric inpatients. Source: Data from Rogers and Pilgrim (1991). cannot be properly measured, and has no units, but the categories can be meaningfully ordered, as they havc been here. Thc resulting data is shown in Figure 2.5. The frequency values indicate that 282 patients (121 + 161) out of475 (more than half) were happy with their psychiatric nursing care. Much smaller numbers expressed dissatisfaction. Exercise 2.4. Calculate the relative frequencies for the frequency data shown in Figure 2.5. What percentage of patients were "very dissatisfied" with their care? Exercise 2.5. In a study comparing two treatments for a whiplash injury, one group of patients received the usual emergency department carc (normal consultation plus an advice leaflet) and the other group received "active management" care (normal consultation plus additional help). IWelve months after the initial contact, the patients were asked to rate the benefits they felt from their treatment. The results are shown in Figure 2.6 for each group (the group "Much better" in ea the missing values of patients felt 10 you think that tne reliabili!yof results in