130 likes | 232 Views
STATISTICAL EVALUATION. STATISTICS. Branch of mathematics concerned with summarizing and making meaningful inferences from collections of data. Descriptive statistics. The listing and summarizing of data in a practical, efficient method.
E N D
STATISTICS Branch of mathematics concerned with summarizing and making meaningful inferences from collections of data
Descriptive statistics The listing and summarizing of data in a practical, efficient method
Histogram - show frequency distribution by means of rectangles
Central Tendency A number that describes something about the “average” score of adistribution mode, median, mean
MODE • Most frequent score • 63, 75, 75, 79, 82, 82, 84, 84, 84, 84, 91 ,99 • what is the mode?
MODE • Most frequent score • 63, 75, 75, 79, 82, 82, 84, 84, 84, 84, 91 ,99 • 84 • 63, 75, 75, 79, 82, 82 ,91, 99 • what is the mode?
MODE • 63, 75, 75, 79, 82, 82 ,91, 99 • 75 and 82 • bimodal • distributions with 2 modes
MEDIAN • The middle score after the scores are ranked from highest to lowest • 65, 78, 78, 81, 84, 92, 96 • what is the median?
MEDIAN • 65, 78, 78, 81, 84, 92, 96 • 81
MEAN • The average • 65, 78, 78, 81, 84, 92, 96 • what is the mean?
MEAN • 65+78+78+81+84+92+96=574 • 574/7= • 82
Inferential Statistics Numerical methods used to determine whether research data support a hypothesis or whether results were due to chance used to make inference from our data to more general conditions