Chapter 7.docx - Chapter 7 Scatterplots Association and...

This preview shows page 1 - 2 out of 2 pages.

Chapter 7: Scatterplots, Association, and Correlation Scatterplots – most common and most effective display for data; best way to start observing the relationship between two quantitative variables (association) Describing scatterplots: Direction: positive and negative associations Form: linear relationship Strength (how much scatter): very/moderately/not strong Scatterplot axes: X-axis: explanatory/predictor variable, acts independently to make y respond Y-axis: response variable; depends on x-variable Correlation Coefficient (r) = (summation of Zx and Zy) / n-1 Correlation – measures the strength of the linear association between two quantitative variables. Conditions for correlation: Quantitative Variables Condition – correlation only applies to quantitative variables Straight Enough Condition – correlation measures the strength only of the linear association Outlier condition – can make a small correlation look big or hide a large correlation Graphing a Scatterplot with correlation coefficient and constants for linear
Image of page 1

Subscribe to view the full document.

Image of page 2
  • Fall '19

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

Ask Expert Tutors You can ask 0 bonus questions You can ask 0 questions (0 expire soon) You can ask 0 questions (will expire )
Answers in as fast as 15 minutes