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Questions and Answers
What does standard deviation summarize in a set of scores?
What does standard deviation summarize in a set of scores?
Which of the following best describes median?
Which of the following best describes median?
What is the primary difference between accuracy and precision?
What is the primary difference between accuracy and precision?
What is a measure of variability intended to indicate?
What is a measure of variability intended to indicate?
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In research, what does generalisation refer to?
In research, what does generalisation refer to?
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Study Notes
Measures of Central Tendency
- Mean: The average score of all values in a dataset, calculated by summing all scores and dividing by the total number of scores.
- Median: The middle score when a dataset is ordered from lowest to highest. If the dataset has an even number of scores, the median is the average of the two middle scores.
- Mode: The score that appears most frequently in a dataset. A dataset can have multiple modes.
Measures of Variability
- Standard Deviation: A statistic that shows how much scores in a dataset spread or deviate from the mean. A larger standard deviation suggests a wider spread of scores.
- Accuracy: How close a measurement is to the true value of what is being measured.
Other Key Terms
- Measure of Central Tendency: A statistic that represents the central or average value of a dataset. The mean, median, and mode are all measures of central tendency.
- Measure of Variability: A statistic that describes how widely scores are dispersed or scattered around the central point.
- Conclusion: A decision made about the meaning of the results obtained from a research study.
- Generalization: A decision about the extent to which findings from a research study can be applied to other individuals or groups.
- Precision: The level of agreement between repeated measurements of the same quantity. While precision suggests consistency, it doesn't indicate how close the measurements are to the true value.
- True Value: The ideal or perfect measurement of a quantity. It's often impossible to determine the true value precisely, but it serves as a theoretical benchmark.
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Description
Test your knowledge on the key concepts of central tendency and variability in statistics. This quiz covers the mean, median, mode, standard deviation, and accuracy. Perfect for students looking to solidify their understanding of statistical measures.
