Question: The air in poultry-processing plants often contains fungus spores. Inadequate ventilation can affect the health of the workers. The problem is most serious during the summer. To measure the presence of spores, air samples are pumped to an agar plate and “colony-forming units (CFUs)” are counted after an incubation period. Here are data from two locations in a plant that processes 37,000 turkeys per day, taken on four days in the summer. The units are CFUs per cubic meter of air.


Conduct a matched pairs t-test to see if the differences in locations is significant. (note: Conduct the test so the mean difference will be positive.)

The value of the mean difference is (round your answer to one decimal place).