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For more information, please see full course syllabus of Statistics
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Lecture Comments (3)

0 answers

Post by Jenny Song on October 29, 2015

Why age of all eight employees is population?

1 answer

Last reply by: MOGIN Daniloff
Sun Apr 20, 2014 9:39 PM

Post by wendy Britton on June 10, 2012

Find the z-scores given the following information:
a. Z.05 the Z is in upper case and the .05 is in lower case

Summarizing Distributions, Measuring Center

  • The mean is the average of the data set. It is influenced by outliers.

  • When computing the median, make sure the data is ordered from lowest to highest.

  • The mode is the most frequently occurring value in the data set. This is best used with qualitative variables.

  • The mean is the best measure of center since it uses all of the observations; however, if the data are skewed, the median is the preferred measure of center.

Summarizing Distributions, Measuring Center

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Measures of Central Tendency 0:08
  • Mean (average) 0:28
    • Mean for Population Data
    • Mean for Sample Data
  • Example: Mean 1:57
  • Example: Mean 2:49
  • Median 3:53
  • Example: Median 4:52
  • Example: Median 6:47
  • Mode 8:01
    • Unimodal
    • Bimodal
    • Multimodal
  • Example: Mode 8:34
  • Example: Mode 9:53
  • Effect of Changing Units 10:31
  • Extra Example 1
  • Extra Example 2