Answer:
Explanation:
Given that Ten fish from each species were randomly selected from each of three lakes and their respective lengths were recorded
a) Experimental unit is the length of two species of fish of lake trout.
b) Population is the set of all species in the lake
c) Sample is the twenty taken for testing
d) Response variable is the length of the fish
e) This is an observational study as already existing is recorded without any external control to change.