For each of the following situations, identify the response variable and the populations to be compared, and give I, the ni, and N
.(a) A poultry farmer is interested in reducing the cholesterol level in his marketable eggs. He wants to compare two different cholesterol-lowering drugs added to the hen's standard diet as well as an all-vegetarian diet. He assigns 25 of his hens to each of the three treatments.
Response variable:
I =
n1 =
n2 =
n3 =
N =
(b) A researcher is interested in students' opinions regarding an additional annual fee to support non-income-producing varsity sports. Students were asked to rate their acceptance of this fee on a five-point scale. She received 95 responses, of which 30 were from students who attend varsity football or basketball games only, 16 were from students who also attend other varsity competitions, and 49 who did not attend any varsity games.
Response variable:
I =
n1=
n2=
n3=
N =
(c) A professor wants to evaluate the effectiveness of his teaching assistants. In one class period, the 36 students were randomly divided into three equal-sized groups, and each group was taught power calculations from one of the assistants. At the beginning of the next class, each student took a quiz on power calculations, and these scores were compared.
Response variable:
I =
n1 =
n2 =
n3 =
N =