OBJECTIVES:
- recognize and differentiate quantitative and qualitative statistical variables.
- Get the absolute frequency and relative frequency of some data and express them in a table.
- Calculate the arithmetic mean and the mode of a dataset.
- Find the median of a data.
- Calculate the range of a set of data. Solve
- by a tree diagram. YOU MUST LEARN
The Statistics collects data to extract information from them.
The statistical variables can be:
- Quantitative
- (if they have numerical values). Qualitative
- (if they have other values.)
The relative frequency of a data is the ratio between the number of times that the data and the total number of data. The sum of the relative frequency is always equal to unity.
The half a data set is obtained by dividing the sum of the products of each absolute frequency data by the total number of data. The
Fashion is data (or data) more often absolute. The
median of a set with an odd number of data is, once sorted, the data that is central. The
median of a set with an even number of data is, once sorted, the average of the two core data.
The range gives an idea of \u200b\u200bthe proximity of the data to the media. Is calculated by subtracting the figure below the figure higher.
PRACTICE:
In the links presented below you have the opportunity to practice and reinforce the concepts used in class.
- Statistics and Probability. Average
- and fashion.
- Medium and dispersion.
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