descriptive statistics
Descriptive statistics: frequency distribution tables and graphs; Various statistics.
inferential statistics
Overall parameter estimation and hypothesis testing.
experiment design
Experimental design: subjects, sampling, design, control and result analysis.
The role of psychology and educational statistics
The role of psychology and educational statistics.
Important scientific methods
Important scientific methods.
An effective tool for quantitative analysis
An effective tool for quantitative analysis.
random phenomenon
Random phenomenon: refers to a phenomenon with the following three characteristics: an experiment has many possible results, all of which are known; It is impossible to predict what kind of results will appear before the test; This test can be repeated under the same conditions.
random event
Random events: Every result of random phenomena is called a random event.
stochastic variable
Random variable: a variable that can represent various results of random phenomena. The variables processed by statistics are all random variables.
Population, individuals, samples
Group: a collection of research objects composed of individuals with some common characteristics; Individual: each unit that constitutes the whole; Sample: select some individuals from the population as the observation object; Sample size: the number of individuals contained in the sample. n .
Statistics and parameters
Statistics: a quantity that describes various characteristics of sample data. Such as arithmetic mean, median, standard deviation, standard score, correlation coefficient, etc. Parameter: a quantity that reflects various characteristics of the overall data.