PPT-Descriptive Measures of Central Tendency

Dakota Davis Slides taken from a Workshop presented by Linda Henkel and Laura McSweeney of Fairfield University Funded by the Core Integration Initiative and the Center for Academic Excellence at Fairfield University. Mean Arithmetic Mean To calculate the arithmetic mean of a set of data we must 64257rst add up sum all of the data values and then divide the result by the number of values Since is the symbol used to indicate that values are to be summed see Sigm Frequencies, . Central Tendency, Dispersion and Standard Deviation. SIT094. The Collection and Analysis of Quantitative Data. Week 3. Luke Sloan. About Me. Name: Dr Luke Sloan. Office: 0.56 . Glamorgan. Types of Biological Data. Summary Descriptive Statistics. Measures of Central Tendency. Measures of Dispersion. Assignments. Scales of Measurement: General Comments . Any observation or experiment in biology involves the collection of information (observe plants). . Importance of central . tendency------. 1-- It is Representative score of group. 2-- Indirect description of the population. 3-- Comparison of performance of two group. . Type of . The Aim. The main purpose of Measures of Central Tendency is to provide a single summary figure that best describes the central location of an entire distribution. . A measure of Central Tendency also helps to simplify comparison of two or more groups tested under different conditions. Measures of Central Tendency. DEF: Those measurements that indicate the central values of a data set (the averages). How many are there?. 3. What are they called?. Mean – Median - Mode. Definitions of the three measures of central tendency. Statistics. Measures of Central Tendency. Measures of Central Tendency. A measure of central tendency is a value that represents a typical, or central, entry of a data set. The three most commonly used measures of central tendency are:. Displaying Data. Question 1a. What does 30 represent on the box plot? . Question 1b. What does 78 represent on the box plot? . Question 1c. What does 105 represent on the box plot? . Question 2a. What is the interquartile range of this box plot? . Variability. Di . Fara. Gino’s. Di . Fara. 1. 2. 4. 3. 4. 4. 3. 4. 1. 3. 3. 2. 5. 3. 2. Gino’s. 2. 3. 2. 3. 2. 2. 4. 4. 4. 3. 2. 4. 3. 2. 4. Σ 44 Σ 44. /15 . /. 15. Sometimes it is referred to as a “middle” number of the data.. Measures of Central Tendency:. A single number to serve as a representative value around which all the numbers in the set tend to cluster.. Descriptive Statistics Part I Each slide has its own narration in an audio file. For the explanation of any slide click on the audio icon to start it. Professor Friedman's Statistics Course by H & L Friedman is licensed under a  by. Dr. Deepali . nigam. Assistant Professor. Department of Physical Education, . Mahila. . Mahavidyalaya. (P. G.) . Kidwai Nagar, Kanpur. Measures of Central Tendency. Measures of central tendency are a combination of two words . The inherent inability of the human mind to grasp in its entirety a large body of data which compel us to seek relatively few constants that will adequately describe the data. .. . The . large number of big figures are not only confusing to mind but also difficult to . Sometimes it is convenient to have one number that describes a set of data. This number is called a measure of central tendency, because it represents the center or middle of the data. The most commonly used measures of central tendency are the .