Data File 1 Statistics in Educational Research

1504 Words Sep 25th, 2013 7 Pages
Date File 1

Chapter One

1) Determine whether the evaluated group is a population or a sample a) Based on a randomly selected group of 500 patients with high cholesterol, it was found that 67% have heart disease. Is this a population or a sample; explain your answer. Raw data is collected from a subset of patient with high cholesterol to determine numbers describing characteristics of the subset (Bennett, Briggis, & Triola, 2009). The raw data collected from the 500 patients is consolidated and summarized to form sample statistics. The raw data and sample statistics are indications that this is a sample (Bennett, Briggis, & Triola, 2009). b) An investigation of 150 randomly selected local restaurants
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What type of sample is this and why? Because it is reasonable to believe that every 1000th member of the income tax return population will represent the entire population, this is an example of a systematic sampling (Bennett, Briggis, & Triola, 2009). f) The name of each contestant is written on a separate card, and the cards are placed in a bag with three names being picked from the bag. What type of sample is this and why? Each member of the contestant population has an equal chance of being picked from the bag (Bennett, Briggis, & Triola, 2009). This is a simple random sampling. 4) Is the study experimental or observation and why? g) A political pollster reports that his candidate has a 10% lead in the polls with 10% undecided. Since this study is only measuring specific characteristics of the political polls without doing anything to influence the numbers (Bennett, Briggis, & Triola, 2009). The study seeks to observe the public’s opinion so it is an observation study. 5) Select the study that is most appropriate and EXPLAIN WHY it is most appropriate for the study. h) Is the aspirin produced by a particular pharmaceutical company better than that of a competitor at relieving headaches? Which of the following would best be used to study this: 1) a case-controlled observation; 2) an observation; 3) a double-blind experimental procedure; and 4) and experimental