My Shot to the Class!!! "Measures of Centray Tendency"

        On the 25th day of April 2011, I gave my best shot in inculcating to my classmates the topic assigned to me. They cheerfully participated in the wake-up dance and gladly answered the personality check.

        After the quick intermezzo, the slides for the days topic, Measures of Central Tendency/Location started to appear on the screen. A active exchange of knowledge took place as my classmate interacts with me by answering the drills and exercises that I prepared. Because of this, I truly thank them.

Measures of Central Tendency is a measure that tells us where the middle of a bunch of data lies. The three most common measures of central tendency are the mean, the median, and the mode.

More about Measures of Central Tendency

• Mean: Mean is the most common measure of central tendency. It is simply the sum of the numbers divided by the number of numbers in a set of data. This is also known as average.
• Median: Median is the number present in the middle when the numbers in a set of data are arranged in ascending or descending order. If the number of numbers in a data set is even, then the median is the mean of the two middle numbers.
• Mode: Mode is the value that occurs most frequently in a set of data.

Examples of Measures of Central Tendency

• For the data 1, 2, 3, 4, 5, 5, 6, 7, 8 the measures of central tendency are
  Mean =
  Median = 5
  Mode = 5

Solved Example on Measures of Central Tendency

Find the measures of central tendency for the data set 3, 7, 9, 4, 5, 4, 6, 7, and 9.
Choices:
A. Mean = 6, median = 6 and modes are 4, 7 and 9
B. Mean = 6, median = 6 and mode is 4
C. Mean = 6, median = 6 and modes are 4 and 9
D. Mean = 6, median = 9 and modes are 4, 7 and 9
Correct Answer: A
Solution:
Step 1: Mean, median and mode of a data set are the measures of central tendency.
Step 2: Mean of the data set =                 [Formula.]
Step 3:                                 [Substitute the values.]
Step 4:                      [Add the data values in the numerator and divide.]
Step 5: The data set in the ascending order is 3, 4, 4, 5, 6, 7, 7, 9, and 9. So, Median of the set is 6.      [Median is the middle data value of the ordered set.]
Step 6: Mode is/are the data value(s) that appear most often in the data set. So, the modes of the data set are 4, 7 and 9.
Step 7: So, the measures of central tendency of the given set of data are mean = 6, median = 6 and modes are 4, 7, and 9.

Other References:

  PDF
DOC      teachers.henrico.k12.va.us/math/.../Documents/10-2/CentralTendency.doc


Youtube
Power Point     https://www.indiana.edu/.../PPTs/r561d3_measures_centrality.ppt

Intro to Agapay's E-Portfolion

This E-Portfolio in Educ 216 is another innovative portal for us students to learn more about to the new methods, strategies and techniques in integrating Information and Communication Technology (ICT) in our lessons. This portal presents a forthright state-of-the-art 21st Century skills in developing the higher order thinking skills and multiple intelligences of the students.

Join me, Richard Astilla Agapay, with my new friends, as we venture into an astonishing way of learning in the cyber world that will surely help us achieving our noble dreams.

I. The Isles of My Portfolio in Educ 216
Chapter 1 Introduction to Statistics
Chapter 2 Variables : The Subject Matter for Statistics & Research
Chapter 3 Measures of Central Location
Chapter 4 Measures of Variation
Chapter 5 Simple Correlation
Chapter 6 Simple Regression
Chapter 7 The Normal Probability Distribution
Chapter 8 Statistical Estimation & Sampling Theory
Chapter 9 Statistical Inference

Chapter10 Z-Test of One Sample Means

Chapter11 T-Test of Significance

Chapter12 ANOVA

Chapter13 Factorial ANOVA

Chapter14 The Chi-Square Test

Chapter15 Computer Statitical Applications using MS Excel

II. STUDENTS' OUTPUTS of E-PORTFOLIO
1. Powerpoint Presentations
2. Hand-outs of Report
2. Video for Demo Teaching
3. Resources / Links
4. Multimedia
5. Games

Link to Prof. Ava