A previous report from a government organization indicates that smokers, on average, miss 6.18 days of work per year due to sickness (including smoking-related acute and chronic conditions). Nonsmokers miss an average of 3.97 days of work per year. If two years later the organization believes that the average days of work missed by smokers has not changed, it could confirm this by sampling. Consider the sample shown below. Determine the sampling error of this sample, assuming that the organization's supposition is correct. 12 10 4 10 10 0 UN O 0 6 3 6 11 5 10 10 12 9 2 6 12 10 The sampling error of the given sample is days. (Round to two decimal places as needed.)