Statistics and Biostatistics Khaloo

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Questions and Answers

What is the primary focus of the field of statistics?

  • Forming hypotheses and designing experiments
  • Developing new statistical methodology
  • Making sense of data arising from random processes or phenomena (correct)
  • Collecting and analyzing data

What is the main difference between mathematical statistics and applied statistics?

  • Mathematical statistics is used for data analysis, while applied statistics is used for data collection
  • Mathematical statistics focuses on theory, while applied statistics focuses on real-world problems (correct)
  • Mathematical statistics is more theoretical, while applied statistics is more practical
  • Mathematical statistics deals with biology, while applied statistics deals with health sciences

What is a data set?

  • A collection of observations of random variables (correct)
  • A sample of a population
  • A single observation of a random variable
  • A population of all possible values of a variable

What is the difference between a quantitative variable and a qualitative variable?

<p>Quantitative variables can be measured, while qualitative variables cannot (D)</p> Signup and view all the answers

What is a population in statistics?

<p>A collection of all possible values of a variable (B)</p> Signup and view all the answers

What is the primary focus of biostatistics?

<p>Applying statistical methods to applications in health sciences and biology (C)</p> Signup and view all the answers

What is an example of a qualitative variable?

<p>Gender (B)</p> Signup and view all the answers

What is the primary goal of summarizing data?

<p>To understand and make sense of the data (C)</p> Signup and view all the answers

What is a variable in statistics?

<p>An object, characteristic, or property that can have different values (C)</p> Signup and view all the answers

What is the difference between a sample and a population?

<p>A sample is a part of a population, while a population is the collection of all possible values (A)</p> Signup and view all the answers

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Study Notes

Statistics and Biostatistics

  • Statistics is the study and use of theory and methods for the analysis of data arising from random processes or phenomena.
  • It involves making sense of data and provides fundamental tools and techniques of the scientific method.
  • Statistics involves:
    • Forming hypotheses
    • Designing experiments and observational studies
    • Gathering data
    • Summarizing data
    • Drawing inferences from data and testing hypotheses

Divisions of Statistics

  • Mathematical Statistics: studies and develops statistical theory and methods in the abstract.
  • Applied Statistics: applies statistical methods to solve real problems involving randomly generated data and develops new statistical methodology motivated by real problems.

Biostatistics

  • Biostatistics is the branch of applied statistics directed towards applications in the health sciences and biology.
  • It involves the application of statistical methods to solve problems in health sciences and biology.

Data and Variables

  • Data: observations of random variables made on the elements of a population or sample.
  • Data can be quantities, numbers, or qualities, attributes measured or observed, and collected and/or analyzed.
  • A collection of data is often called a data set.
  • Variables:
    • Can be quantitative (measurable): heart rate, heights, weight, age, size of tumor, volume of a dose.
    • Can be qualitative (categorical): gender, race, drug name, disease status.

Populations and Samples

  • A population: the collection or set of all of the values that a variable may have.
  • A sample: a part of a population.

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