MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Sampling Method The patients included in the study cited in Exercise 1 were those “who sought care for low-back pain directly or in response to a community advertisement.” What type of sampling best describes the way in which the 1643 subjects were chosen: simple random sample, systematic sample, convenience sample, stratified sample, cluster sample? Does the method of sampling appear to adversely affect the quality of the results?
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- Smallpox Vaccine.ABCNEWS.com published the results of a poll that asked U.S. adults whether they would get a smallpox shot if it were available. Sampling, data collection, and tabulation were done by TNS Intersearch of Horsham, Pennsylvania. When the risk of the vaccine was described in detail, 4 in 10 of those surveyed said they would take the smallpox shot. According to the article, “the results have a three-point margin of error” (for a 0.95 confidence level). Use the information provided to obtain a 95% confidence interval for the percentage of all U.S. adults who would take a smallpox shot, knowing the risk of the vaccine.arrow_forwardwhat was the margin of error for this study?arrow_forwardYou have reason to believe that the weekly viewing of Big Bang Theory (the television show, not the actual theory) will lower an individual's IQ. In February, seven test participants who had never watched the show were gathered, given an IQ test, subjected to weekly viewing of the show for 12 weeks, then in May given another similar IQ test. Results are as follows. Sums of interest included = 47 and 2 Σ (d-a) ² = 29.429. Participant ABCDEFG Feb 92 121 115 87 132 99 124 IQ test result May 86 118 110 78 125 91 115 4arrow_forward
- A power analysis is a calculation used to estimate the smallest sample size needed for an experiment, given a required significance level, statistical power, and effect size. It helps to determine if a result from an experiment or survey is due to chance, or if it is genuine and significant. Think of an experiment or a survey that you have conducted or will conduct in your field of interest and use it to discuss the following questions: 1. Describe the importance of power analysis in an experiment. 2. How will you determine the appropriate significance level for a power analysis? 3. Explain, in your own words, how you will conduct a power analysis in your experiment or survey.arrow_forwardAn educator wants to determine whether a new curriculum significantly improves standardized test scores for students. She randomly divides 60 students into two groups. Group 1 is taught using the new curriculum, while group 2 is taught using the traditional curriculum. At the end of the school year, both groups are given the standardized test and the mean scores are compared. Determine whether the sampling is dependent or independent. Indicate whether the response variable is qualitative or quantitative Determine whether the sampling is dependent or independent. OA. The sampling is independent because the individuals selected to be in one sample are used to determine the individuals to be in the second sample. B. The sampling is dependent because the individuals selected to be in one sample are used to determine the individuals to be in the second sample. C. This sampling is independent because the individuals selected for one sample do not dictate which individuals are to be in a…arrow_forwardWhat statistical methods are typically used in an inferential study?arrow_forward
- You can reduce the risk of a Type I error by using a larger sample. True or False?arrow_forwardAcne is a common skin disease that affects most adolescents and can continue into adulthood. A study compared the effectiveness of three acne treatments and a placebo, all in gel form, applied twice daily for 12 weeks. The study's 517 teenage volunteers were randomly assigned to one of the four treatments. Success was assessed as clear or almost clear skin at the end of the 12 week period. The results of the study can be seen in the table below. Using the appropriate statistical test, determine if there is significant evidence that the four treatments perform differently. If so, how do they compare.arrow_forwardHow does an observed sample mean qualify as a rare outcome?arrow_forward
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