Consider Table 5-15 on the summary of patient satisfaction ratings. The percentages in each rating category are based on a response from a total of 200 patients from a prior year. For the item waiting time prior to being seen by a physician, consider the combined proportion of patients who are satisfied, that is, includes those in the category of very satisfied or satisfied. Suppose that, based on a survey during the current year, out of a total of 400 patients, 85% of them expressed a rating of very satisfied or satisfied. Can we conclude that there has been an increase in the overall proportion of satisfied patients from a prior year to the current year? Use a level of significance of 5%.

Table 5-15

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TABLE 5-15 Patient Satisfaction Data on Timeliness of Operations Rating Items 1 2 4 5 1. Waiting time at registration 2. Time to occupy bed 3. Waiting time prior to being seen by a physician 10 40 20 20 10 10 30 30 20 10 10 10 40 35 4. Timeliness of nurse visits 30 20 20 20 10 5. Waiting time to be checked out 20 30 10 30 10 3,