John Isaac Inc., a designer and installer of industrial signs, employs 60 people. The company recorded the type of the most recent visit to a doctor by each employee. A national assessment conducted in 2014 found that 53% of all physician visits were to primary care physicians, 19% to medical specialists, 17% to surgical specialists, and 11% to emergency departments. Test at the .01 significance level if Isaac employees differ significantly from the national survey distribution.

National Problem 6 Proportion Visit Type Observed Expected 0.53 Primary care 29 0.19 Medical specialist 11 0.17 Surgical specialist 16 0.11 Emergency 4 60