Read the summary and the most important questions on Statistics The Art and Science of Learning from Data : Third Edition : Alan Agresti & Christine Franklin | 9781784483517 | Alan Agresti; Christine A. Franklin

• 1 statistics: the art and science of learning from data

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• what is descriptive statistics?

  summarizing and analyzing the data, thats obtained.

• what is inferencial statistics?

  making decisions and predictions based on the data for answering statistical questions.

• what is a (sample) statistic?

  a numerical summary of a sample taken from the population.

• 2 Exploring data with graphs and numerical statistics

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• when is a variable categorial and when is it quantitative?

  it's categorial if the observations can be put in categories, and its's quantitative if the observations can be expressed in numbers.

• what is the key characteristic of a quantitive variable?

  there has to be different magnitudes, or you need to be able to take an average of the variable.

• when is a quantitive variable dicrete, and when is it continuous?

  it is descrete when it's possible values form a set of seperate numbers, it's continuous when the possible values form an interval.

• what is the modal category?

  the category with the highest frequency.

• what is the pareto principle?

  a small subset of categories often contains most of the observations.

• what is a histogram?

  a bar graph that shows the (relative) frequencies of the observations of a quantative variable.

• if the set of data is small which type of graph is usually preferred?

  the stem-and-leaf plot or the dot plot is usually preferred.