A pharmaceutical company wishes to test the effects of a herbal supplement on an
ID: 3046583 • Letter: A
Question
A pharmaceutical company wishes to test the effects of a herbal supplement on anxiety levels. The researcher randomly selects a sample of n=16 adults from Essex County. The sample is randomly assigned to either the herbal supplement, Group B or a placebo, Group A.
Here are the data:
GROUP “A” GROUP “ B “
12, 16, 18, 21, 13, 18, 20, 16
17, l8, l8, 19 19, 21, 19, 22
9. Why is using a random sample important in this study?
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10. If a researcher failed to use random assignment, how would this affect the research conclusion?
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11. If a researcher failed to use a random sample, how would this affect the research results?
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12. Run the appropriate SPSS analysis on the data and cut and paste your SPSS results here:
13. Based on your SPSS results, please answer the following questions:
(a) What is the appropriate decision, reject the null or fail to reject the null? _________________________
(b) Write the “statistical statement” of your SPSS analysis: ________________________
( c) Please write your results as they might be written in a research study (refer to the “In the Literature” section of chapter lo of your textbook).
________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
(d) Is there a probability of Type I error? Yes ________ No ______
(e) Is there a probability of Type II error? Yes_____ No______
Explanation / Answer
answering q1 as per Chegg policy
9)
Using the technique of simple random sampling ensures that each unit of the population has equal an independent chance of being included in the sample. the sample obtained by the technique of simple random sampling is generally reliable and a good representative of the population. a reliable sample gives me reliable and valuable results.
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