manhole betydelse and definition

Exempel på manhole

• The different shadings show the number of manholes in the square.

• The number of manholes baited varies from year to year.

• The different shadings show the density of rat activity (expressed as number of bait takes per 100 manholes).

• The number of statistically significant results found means that the null hypothesis that rodents are evenly distributed amongst the manholes must, therefore, be firmly rejected.

• Expected value is total number of hits divided by number of manholes r100 (true alpha=0.0132).

• We, therefore, restrict ourselves to saying that there tend to be more hotspots in areas of higher manhole density.

• It was important to determine how often annual baiting recorded their presence or activity at each manhole.

• Within the tests, the null hypothesis was that rats would be equally likely to be found in each manhole within the system.