Another key component of proper sampling is the size of the sample. Consequently, we tend to use a conservative analysis approach that is based on polynomial regression that starts by overfitting the likely true function and then reducing the model based on the results.

Measures of spread: these are ways of summarizing a group of data by describing how spread out the scores are.

We have provided some answers to common FAQs on the next page. Properties of samples, such as the mean or standard deviation, are not called parameters, but statistics. However, not all students will have scored 65 marks.

For the purpose of describing properties, it uses measures of central tendency, i. The data is summarised by the researcher, in a useful way, with the help of numerical and graphical tools such as charts, tables, and graphs, to represent data in an accurate way.

In descriptive statistics, measurements such as the mean and standard deviation are stated as exact numbers.

Inferential Statistics is used to determine the probability of properties of the population on the basis of the properties of the sample, by employing probability theory. It helps us in the collection, analysis and presentation of data.

Instead, scientists express these parameters as a range of potential numbers, along with a degree of confidence.

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Descriptive vs. Inferential Statistics