quasi-experimental study 1- General introduction about study design 2- Definition and characteristics of the study 3- Measures used in the study 4- Advantages and disadvantages 5- Summary of any one study from published literature (Objective, Method: study population, selection criteria of subject, measures used for analysis, Result and Conclusion) 6- Conclusion

quasi-experimental study 1- General introduction about study design 2- Definition and characteristics of the study 3- Measures used in the study 4- Advantages and disadvantages 5- Summary of any one study from published literature (Objective, Method: study population, selection criteria of subject, measures used for analysis, Result and Conclusion) 6- Conclusion

Name: quasi-experimental study1- General introduction about study design2- D
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Description: quasi-experimental study1- General introduction about study design2- Definition and characteristics of the study3- Measures used in the study4- Advantages and disadvantages5- Summary of any one study from published literature (Objective, Method: stud

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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The following table was presented in an article summarizing a study to compare a new drug to a standard drug and to a placebo. Characteristic* New Drug Standard Drug Placebo p Age, years 45.2 (4.8) 44.9 (5.1) 42.8 (4.3) 0.5746 % Female 51% 55% 57% 0.1635 Annual Income, $000s 59.5 (14.3) 63.8 (16.9) 58.2 (13.6) 0.4635 % with Insurance 87% 65% 82% 0.0352 Disease Stage 0.0261 Stage I 35% 18% 33% Stage II 42% 37% 47% Stage III 23% 51% 20% *Table entries and Mean (SD) or % 1. Are there any statistically significant differences in the characteristics shown among the treatments? Justify your answer. 2. Consider the test for differences in age among the new drug compared to the placebo (two variables). Write the hypotheses and the formula of the test statistic used (No computations required – formula only).
Different COVID vaccines are available today and the top five vaccines accepted by WHO are Moderna (MD), AstraZeneca (AZ), Pfizer (PF), Sinovac (SV), and Sinopharm (SP). Here are the sample data shows the usage of different vaccines, Use (Excel / manual) to calculate frequency, percent frequency & relative frequency of sample data? AZ MD MD AZ PF PF AZ PF SP MD PF SV MD PF MD AZ PF SV SV AZ MD AZ PF MD PF PF SV MD SV SV MD PF SV SV SP AZ SV SP SP MD
Customers at IT Phone Call Center have been complaining that they are waiting too long for service. The managers at the call center have taken notice and asked you to do some investigating to determine the typical service time for their customers for morning shifts compared to evening shifts. You collect the following samples (time in minutes): Morning shifts: 8, 15, 16, 18, 18, 20, 21, 21, 21, 56 Evening shifts: 3, 11, 12, 14, 22, 22, 30, 33, 34, 47 Explain in detail which descriptive statistic (mean, median, or mode) you would utilize to communicate the typical service time to your boss for each shift and why. In your explanation, be sure to include which shift (morning or evening) has the quicker turn-around time.
what are the factors affecting the performance of the Cross-Validation technique?
1. Are there any statistically significant differences between the patients assigned to the experimental treatment and placebo? Justify 2. Consider the comparison of treatments with respect to patient age. Run appropriate test using data.
t-tests are widely used in public health research. Please list one scenario that two-sample t-test is appropriate, and one scenario that paired t-test is appropriate. Make sure to justify why the specific type of t-test is appropriate for the scenario.
39. You are interested in further investigating whether there is a causal relationship between stress and sleep quality. а. What type of study design will you choose? Select one: (a) Experimental (b) Quasi-experimental (c) Non-experimental Select one: (a) Retrospective (b) Prospective (c) Cross-sectional Select one: (a) Case-Control (b) Cohort (c) Ecologic (d) Randomized Controlled Trial b. Provide a justification for your selections: c. Identify at least one potential confounding variable. Explain why it may be a confounder and how you might control for it. 40. Answer the following questions regarding sampling method and its relationship to validity. а. What type of sampling method is convenience sampling? Type of sampling method: (a) Probability (b) Non-probability b. How would using a convenience sample affect the external validity of your study? c. How would using a convenience sample affect the internal validity of your study? С.
What is the critical value for a set of sample data that has 5 treatments with 5 samples for each treatment, evaluated at the 10% level of significance?
On a trial basis, State College admitted 300 students from the lowest third of their high school graduation class. They were randomly divided into 3 groups. Group A received extensive training in study habits Group B received motivational lectures; and Group C received no special treatment. At the end of the year, the average grades of the groups were compared. Identify the following: * What is the Independent variable? * What is the Dependent variable? * Who is in the Experimental Group? * Who is in the Control Group? * What are at least 2 potential extraneous variables?
The criminal justice training institute of a particular state developed a "new and improved" training course for police officers who were learning safety issues in domestic violence incidents. Sixty trainees were randomly assigned to two groups: 30 took the customary course and 30 took the new course. All 60 trainees were given the same exam to measure their skills. Skills Learned Customary Course New Course Excellent 7 13 Good 15 15 Unsatisfactory 8 2 Calculate the appropriate test statistics and df. Compare the obtained test statistic to the critical value at the .05 alpha level. Do you accept or reject the null hypothesis, explain.
One-way ANOVA: Check NEON data set, and download data of a variable from five locations. 1) Please test whether the means of the variable are different among all locations. 2) If there is significance, please test significant differences among locations using multiple comparison. Plants are sampled from three treatment plots and measured for biomass. In treatment A plot, biomass of plants: 5, 7, 4, 5, 6, 8, 9, 10; In treatment B plot, biomass of plants: 8, 10, 9, 6, 5, 12, 9, 11. In treatment C plot, biomass: 12, 14,15, 18, 16, 12, 11, 15. Please test whether there is a treatment effect. If there is, please conduct multiple comparison.