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Outline the design of this study in schematic form.

01 / 10 / 2021 Certificate IV In Commercial Cookery

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Module Two Problem Set 1. Five-City Project. The Stanford Five-City Project is a comprehensive community health education study of five moderately sized Northern California towns. Multiple-risk factor intervention strategies were randomly applied to two of the communities. The other three cities served as controls.
2. Campus survey. A researcher conducts a survey to learn about the sexual behavior of college students on a particular campus. A list of the undergraduates at the university is used to select participants. The investigator sends out 500 surveys but only 136 are returned.
a. Consider how the low response rate could bias the results of this study.
b. Speculate on potential limitations in the quality of information the researcher will receive on questionnaires that are returned.
3. Employee counseling. An employer offers its employees a program that will provide up to four free psychological counseling sessions per calendar year. To evaluate satisfaction with this service, the counseling office mails questionnaires to every 10th employee who used the benefit in the prior year. There were 1000 employees who used the benefit. Therefore, 100 surveys were sent out. However, only 25 of the potential respondents completed and returned their questionnaire.
a. Describe the population for the study.
b. Describe the sample.
c. What concern is raised by the fact that only 25 of the 100 questionnaires were completed and returned?
d. Suppose all 100 questionnaires were completed and returned. Would this then represent an SRS? What type of sample would it be?
4. Body weight expressed as a percentage of ideal. Body weights of 18 diabetics expressed as a percentage of ideal (defined as body weight ideal body weight 100) are shown here. Construct a stem-and-leaf plot of these data and interpret your findings.
107 119 99 114 120 104 88 114 124 116
101 121 152 100 125 114 95 1175. Air samples. An environmental study looked at suspended particulate matter in air samples (g/m3) at two different sites. Data are listed here. Construct side-by-side stemplots to compare the two sites.
Site 1: 68 22 36 32 42 24 28 38
Site 2: 36 38 39 40 36 34 33 326. What would you report? A small data set (n = 9) has the following values {3.5, 8.1, 7.4, 4.0, 0.7, 4.9, 8.4, 7.0, 5.5}. Plot the data as a stemplot and then report an appropriate measure of central location and spread for the data.7. Melanoma treatment. A study by Morgan and coworkers used genetically modified white blood cells to treat patients with melanoma who had not responded to standard treatments. In patients in whom the cells were cultured ex vivo for an extended period of time (cohort 1), the cell doubling times were {8.7, 11.9, 10.0} days. In a second group of patients in whom the cells were cultured for a shorter period of time (cohort 2), the cell doubling times were {1.4, 1.0, 1.3, 1.0, 1.3, 2.0, 0.6, 0.8, 0.7, 0.9, 1.9} days. In a third group of patients (cohort 3), actively dividing cells were generated by performing a second rapid expansion via active cell transfer. Cell doubling times for cohort 3 were {0.9, 3.3, 1.2, 1.1} days. Data are available in Excel and SPSS formats on the companion website as file MORGAN2006.*. Here is where you would log in to the companion website: http://publichealth.jbpub.com/Gerstman2e/Login.aspx?ref=/Gerstman2e/default.aspx a. Create side-by-side boxplots of these data.
b. In addition, calculate the mean and standard deviations within each group. Comment on your findings.

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