For part a the options for (Click For list are)

1. adult male
2. cholesterol levels
3. presence or absence of plant sterols

for part b the options for (Click for list) are

1. response bias variable
2. lurking variable
3. influential variable

a) Researchers are setting up an experiment to determine the effect of plant sterols on lowering cholesterol in adult males They randomly assign 50 males to a group that is given plant sterols, and 50 males to a group that is given a placebo. They measure each male's cholesterol level at the beginning of the experiment, and again 4 weeks later, Identify the experimental unit, the response variable, and the explanatory variable: (Click For List) is the experimental unit. (Click For List) Mis the response variable (Click For List) Yis the explanatory variable. b) The researchers neglected to account for the activity level of each male, which could have an effect on the outcome of the experiment. This type of variable is known as a: (Click For List)