Practice Exam I A researcher is interested in average caloric intake of patients

Question

Practice Exam I A researcher is interested in average caloric intake of patients receiving chemotherapy. Data was gathered from three different clinics, each providing data from 10 patients. T following tables/graphs help summarize some of the results Mean SD 1542 900 352 01 Median 136 03 2180 3453 Max Histogram of Caloric Intake 500 1000 1500 2000 2500 300 3500 kcalday 1. What is the population of interest? 2. What is the variable of interest? 3. What is the sampling protocol used? 4. Determine the range 5. If a patient from the sample is selected at random, what is the probability the patient consumes at least 2000 kcal/day?

Explanation / Answer

1. Population is the entire pool from which a statistical sample is drawn. Therefore here Population of interest is Patients receiving chemotherapy.

2. A variable is any characteristics, number, or quantity that can be measured or counted. Therefore here Variable of interest is Calorie intake.

3. The sampling protocol is the procedure used to select units from the study population to be measured.The goal of the sampling protocol is to select units that are representative of the study population with respect to the attribute(s) of interest. Therefore Sampling protocol of this study is-

Here the variable of interest is average calorie intake of patients receiving chemotherapy and the units are selected from 3 different clinics of different cities(10 patient from each clinic).

4. Range is the difference between the lowest and highest values.Therefore, here Range is

max value - min value i.e. 3453-352= 3101.

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