Predictions from a mathematical model (from Lima et al. 1985…

Predictions from a mathematical model (from Lima et al. 1985) were tested using an experiment that manipulated the size of food items and the distance of food items from trees.  Results from the experiment are shown in the figure below.  Which of the following is TRUE about the results?

Suppose you were interested in whether the concentration of…

Suppose you were interested in whether the concentration of herbicides in pond water affected egg development in frogs.  You measure herbicide concentration and egg developmental success in 10 ponds that are similar in size and location, and you plot your data on a graph.  Of the figures above, which plot would suggest a negative correlation between herbicide concentration and egg developmental success.  

A blueberry farmer is concerned that animals are eating his…

A blueberry farmer is concerned that animals are eating his berries before harvest.  He wants to determine whether birds or rodents may be eating the berries.  Because he has observed birds in his fields every morning, he hypothesizes that birds are eating the berries and having a negative impact on his harvest.  He predicts that if he excludes birds from blueberry bushes, he will harvest more berries.  In an experimental blueberry field, he covers half the rows with nets that keep birds out; the other rows remain as they were.  He weighs the number of berries harvested from each row over an eight week period. What is the control group in the farmer’s experiment?