Biostatistics - Intro

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Biostatistics Introduction

Bio – life:

Bio – life Statistics is the “mathematics of collection, organization, analysis and interpretation of numerical data”. Especially, the analysis of “population characteristics” by “inference from sampling” is the task of statistics.

Biostatistics is a discipline that is concerned with:

Biostatistics is a discipline that is concerned with Designing experiments and other data collection methods Summarizing information to aid understanding Drawing conclusions from data Estimating the present and predicting the future In making predictions, statistics uses the companion subject of probability which models chance mathematically and enables calculations of chance in complicated cases.

Some Important Definitions in Biostatistics:

Some Important Definitions in Biostatistics Population: An entire set of objects, observations, or scores that have something in common. For example, a population might be defined as all students between ages of 15-18 in a school. Sample: A sample is a subset of population since it is usually impractical to test every member of a population; a sample from a population is typically the best approach available.

Definitions – Continued.:

Definitions – Continued. Variable: Any measurable that changes its value from time to time. Class / Group: A logical division of a large group of subjects (people, plants, animals, things) used to categorize a population or sample. Class limits: The smallest and largest data values of a class / group, e.g., if class is 12-14 (12 lower limit, 14 upper limit). Class Boundaries: The halfway points that separate the values in classes, e.g., if class is 12-14 (11.5-14.5).

Definitions – Continued.:

Definitions – Continued. Open-ended classes: The classes that does not have either upper or lower limits, e.g., 5 and below, 70 and above.

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