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
The population sampled due to its specific nature i.e., college students, and college graduates would need to be contemplated in regards to the testing results as it is offered as a depiction of the general population.
3- How would you make it an experimental (rather than correlational) study (it might help to be specific here as well and define the two types of studies in your
1.What two factors did you investigate in your procedure, and why did you choose to compare these two factors?
8. The researchers state that the sample for their study was 28 women with a diagnosis of OA, and that 18 were randomly assigned to the intervention group and 10 were randomly assigned to the control group. Discuss the study strengths and/or weaknesses in this statement.
1. The researchers analyzed the data they collected as though it were at what level of measurement?- The correct answer is Interval/ratio.
Method: The type of article would be an empirical study. The purpose of the study was to examine
Part B: How might each of the following concepts affect the results of the study?
5) This is also a quasi-experiment because they selected the variables but they can’t really control the outcome of the experiment.
2. Choose one of the research questions from above and consider it in more detail. Based upon the question, what would be a reasonable hypothesis?
What kinds of studies are high in external validity? What kinds of studies are high in internal validity? Explain why each kind of study seems to have advantages / disadvantages in terms of external & internal validity.
A population is the entire group to be studied and a sample is a portion of the population.
a. The study was designed as an experimental research by using independent and dependent variables.
3. your proposed methodology. Be sure to specify, where appropriate, dependent and independent variables, controls if applicable, and the data you will collect
Sampling is taking a few items from a population that fairly represent the population to obtain information about the population from them. It is usually one of the key steps in research because it determines the validity and reliability of research results. This crucial yet arduous task in research has led statisticians and software developers to create software that can ease this process for many researchers in various fields of study. An example of such a sampling software is the Visual Sample Plan version 7.0 (VSP 7.0).
(ii) Experimental vs Non-experimental Research: Experimental research examine the possible influence that one factor or condition may have on another factor or condition. The experimental research is mostly conducted in laboratory, as it is in physics, biology and other pure sciences.