Use the comparison named in the investigation and write a precise null hypothesis that states there is no significant difference between those two groups or sites.
There is considerable variation in the ecosystems that occur in the continent of North America. These include coniferous forest, prairie grassland, scrub and desert. Large areas of land that once contained natural ecosystems are now used for agriculture.
The diversity of some beetle species that feed on animal dung (faeces) was investigated at two types of grassland site in North America. The first type of grassland site was grazed by cattle and the second type of site was not grazed.
Dung beetles were collected, identified and counted from two areas of the same total size. Some of the results are shown in Table 8.1.
Table 8.1
State the null hypothesis for a statistical test comparing the data from the two types of site.