{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

101 Ch. 13 - Chapter 13 Experiments Objectives Know the...

Info icon This preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 13 Experiments
Image of page 1

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

View Full Document Right Arrow Icon
Objectives Know the difference between an observational study and an experiment Apply the basic principles of experimental design: Control, Randomization, Replication, Blocking Be able to diagram an experiment Understand the value of a placebo and blinding in experiments
Image of page 2
Observational Study Observing data in “the wild” Researchers don't assign treatments to subjects; they simply observe them Retrospective Study Prospective Study Results show association, but do not prove causation.
Image of page 3

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

View Full Document Right Arrow Icon
Experiments A way to prove a cause and effect relationship between two or more variables Manipulate explanatory variable Observe response Experimental Units – individuals on whom an experiment is performed
Image of page 4
Experiments Factors – explanatory variable(s) Need at least one factor for every experiment Levels – specific values that the experimenter chooses for a factor Need at least two levels for each factor Treatments – different levels of a single factor or are combinations of levels of two or more factors
Image of page 5

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

View Full Document Right Arrow Icon
Example – OptiGro Fertilizer An ad for OptiGro plant fertilizer claims that with this product we will grow “juicier, tastier” tomatoes. We'd like to test this claim and see if we can get by with a half-dose.
Image of page 6
Image of page 7
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