1- While censusing weeds in eight pots, the number of leaves was counted on each plant. The researchers next want to know if there are significant differences in number of leaves per plant among the eight pots.

options:

• 1-sample t test

• correlation analysis

• linear regression

• analysis of variance

2- Woodlice (a.k.a. pillbugs or roly-polies) can contain gut parasites. We collect 4 woodlice each of three different species, dissect their digestive organs, and identify all parasites. We want to know if any of the three species of woodlice have a significantly greater number of species of parasites than the other woodlice species.

options:

• 2-sample t test

• correlation analysis

• linear regression

• analysis of variance

3- Climate change researchers are interested in the amount of carbon sequestered in different habitats and how this varies with temperature. Remote sensing equipment is used to estimate the annual carbon uptake in 30 identically sized plots in grassland, deciduous forest and deciduous forest (10 plots in each habitat). They compare the values from 2006 (a really warm year) and 1996 (a really cold year) in all the plots, and record whether they went up from 1996 to 2006, went down, or stayed about the same.

options:

• 2-sample t test

• 2-variable chi-square test

• linear regression

• analysis of variance