Lecture2 Freq. Distribution

Lecture2 Freq. Distribution - Why bother Frequency...

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

View Full Document Right Arrow Icon
Why bother? Frequency Distribution (F.D.) - a collection of observations produced by sorting observations into classes and showing their frequency ( ƒ ) of occurrence in each class 1
Image of page 1

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

View Full Document Right Arrow Icon
Why bother? Unfiltered data can often contain a prohibitive amount of information Condense information into a more manageable/ comprehensible format Identify trends 2
Image of page 2
Why bother? Detect outliers Outlier - extreme scores that may indicate errors, interfere with with further statistical analysis, or be informative in its own right 3
Image of page 3

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

View Full Document Right Arrow Icon
Ungrouped Frequency Distributions 1) Find highest and lowest numbers in data set 2) Plug in values as high and low points in left column of frequency distribution 3) Fill in left column with ALL POSSIBLE VALUES btw. the two extremes, even those with ƒ = 0 4) Count observations and fill in ƒ column Height ƒ 185 2 184 0 183 0 182 0 181 3 180 1 179 0 178 1 177 0 176 2 4
Image of page 4
Ungrouped Frequency Distributions 178 176 181 181 176 185 185 180 181 Height ƒ 185 2 184 0 183 0 182 0 181 3 180 1 179 0 178 1 177 0 176 2 { n = 9 observations ƒ = 2 + 3 + 1 + 1 + 2 = 9 5
Image of page 5

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

View Full Document Right Arrow Icon
Weaknesses of Ungrouped F.D.’s
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