Investigators developed two new vaccines to immunize mice against Lyme disease and tested them under field conditions by applying one of the two vaccines to mice selected at random by live trapping at three trapping grids. They then conducted trapping a second time, testing mice for Lyme disease, recording whether they were positive or negative for the disease. Were these vaccines effective at preventing Lyme disease? Did their effectiveness differ by grid? These data meet the assumptions of parametric statistics.
|
Vaccine
|
Grid 4
|
Grid 5
|
Grid 6
|
|
Positive
|
Negative
|
Positive
|
Negative
|
Positive
|
Negative
|
|
GST
|
36
|
167
|
19
|
109
|
14
|
104
|
|
OspA
|
28
|
236
|
9
|
131
|
14
|
154
|