Studies are often done by pharmaceutical companies to determine the effectiveness of a treatment program. Suppose that a new AIDS antibody drug is currently under study. It is given to patients once the AIDS symptoms have revealed themselves. Of interest is the average (mean) length of time in months patients live once they start the treatment. Two researchers each follow a different set of 40 patients with AIDS from the start of treatment until their deaths. The following data (in months) are collected. Researcher A: 3;4;11;15;16;17;22;44;37;16;14;24;25;15;26;27;33;29;35;44;13;21;22;10;12;8;40;32;26; 27;31;34;29;17;8;24;47;47;33;34 Researcher B: 3;14;11;5;16;17;28;41;31;18;14;14;25;25;21;22;31;2;35;44;23;21;21;16;12;18;41;22;16; 25;33;34;29;13;18;24;23;42;33;29 Determine what the key terms refer to in the example for Researcher A. variable statistic sample parameter population 1. X : the length of time (in months}AlDS patients live after treatment. 2. AIDS patients 3. The 40 AIDS patients in the study. 4. The average length of time (in months}AlDS patients live after treatment in the sample. 5. The average length of time (in months}AlDS patients live after treatment