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Questions and Answers
What is the primary focus of biostatistics?
What is the primary focus of biostatistics?
A population is a set of values that a variable can have.
A population is a set of values that a variable can have.
True
What distinguishes a parameter from a statistic?
What distinguishes a parameter from a statistic?
A parameter refers to a characteristic of the population, while a statistic refers to a characteristic of the sample.
A collection of data is often called a _____ set.
A collection of data is often called a _____ set.
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Which of the following best describes a quantitative variable?
Which of the following best describes a quantitative variable?
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Match the following terms with their definitions:
Match the following terms with their definitions:
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Data is singular and refers to a single observation.
Data is singular and refers to a single observation.
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Provide one example of a qualitative variable.
Provide one example of a qualitative variable.
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Study Notes
Statistics
- Statistics is the study of how we make sense of data arising from random processess or phenomena.
- The field of statistics provides fundamental techniques for the scientific method through:
- Forming hypotheses
- Designing experiments and observational studies
- Gathering data
- Summarizing data
- Drawing inferences from data and testing hypotheses
Branches of Statistics
- Mathematical Statistics is the development of statistical theory and methods.
- Applied Statistics involves the application of statistical methods to solve real problems involving randomly generated data.
Biostatistics
- Biostatistics is a branch of applied statistics focusing on health sciences and biology.
Data
- Data are observations of random variables made on elements of a population or sample.
- Data are quantities, numbers, or qualities observed and collected for analysis.
Variables
- A variable is an object, characteristic, or property that can vary in different places, persons, or things.
- A quantitative variable can be measured.
- Examples: heart rate, height, weight, age, size of a tumor, volume of a dose.
- A qualitative (categorical) variable cannot be measured, but can be sorted into categories.
- Examples: gender, drug name, disease status.
Populations and Samples
- A population is the collection of every value that a variable may have.
- A sample is a part of the population.
- We use sample data to draw inferences about the population.
- The sample mean is not the true mean but may be very close depending on the sample size.
Parameters vs. Statistics
- A parameter is a characteristic of the population.
- A statistic is a characteristic of the sample.
- We estimate sample mean to have insight on the true population mean.
- The sample mean is a ‘statistic’.
- The population mean is a ‘parameter’.
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Description
Explore the fundamental principles of statistics, including its branches such as mathematical and biostatistics. Understand how data is gathered, summarized, and analyzed to form hypotheses and draw inferences. This quiz will test your knowledge on key concepts and applications in the field of statistics.
