MATH
Module 9 Review.docx

Confidence interval z 95 99 2575 in evaluating reports

Info icon This preview shows pages 4–5. Sign up to view the full content.

Confidence Interval z-score 90% 1.645 95% 1.96 98% 2.33 99% 2.575 In evaluating reports, try to answer the following questions: What is the purpose of the study? How was the data collected? Are the data collection methods appropriate for the type of study? Was there any potential bias? If so, how was it reduced? Who were the participants and how were they chosen? Were the correct statistical tests used for the data?
Image of page 4

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

Was the data presented? What are the results? Are the conclusions appropriate? In an observational study or survey, the results can estimate population proportions or population means, or suggest there may be a relationship between variables. A cause-and-effect relationship cannot be established through observational studies or surveys. 09.08 Using Experiments An experiment should consist of the following parts: Introduction and research question Methodology—including how the sample will be chosen, randomization, and any decisions that will be made during the study Results should include all data that was collected and any statistical tests Discussion—including any conclusions, benefits, and suggestions for further study. Bias is introduced through design, and one way to reduce possible bias is through randomization of the control and treatment groups. To test whether a difference between treatment and control groups exists, the data can be re-randomized many times to test the probability that the difference of means that was found in the study is likely to happen by chance.
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern