In the realm of education, the necessity to assess and analyze student performance arises frequently. Whether it’s grading exams or evaluating other variables like age, height, or weight, the process of assigning scores can be complex due to various factors such as question difficulty, teacher tendencies, and measurement errors. Consider the example of a
Fractiles, quartiles, deciles, and percentiles are terms used in statistics to describe different points that divide a dataset into various segments, helping to understand the distribution of data. Here’s a breakdown of each term: Fractiles: Fractiles are points on a number scale that divide a dataset into specific portions. Quartiles, deciles, and percentiles are examples
Line Graphs: Line graphs use lines to connect data points, usually representing trends or changes over time. They’re great for showing continuous data and how it fluctuates. Bar Graphs: Bar graphs are made up of vertical or horizontal bars to represent data. They’re perfect for comparing categories or groups and showing the magnitude of different
Four Scales of Measurement: Nominal: Data is categorized into distinct groups with no specific order. Examples include gender, ethnicity, and eye color. Ordinal: Data can be ranked or ordered, but the differences between values are not consistent or meaningful. Example: Education levels (e.g., high school, college, postgraduate). Interval: Data is measured on a scale where
Quantitative Variables take values that very in terms of magnitude. They are easy to measure and compare with one another. These may be scores obtained in a test, weight, height, age, distance, number etc. Qualitative Variables are those that differ in kind. They are only categorized. The differences are usually in kind such as marital
Parametric tests are statistical tests that make specific assumptions about the underlying distribution of the data, such as normality and homogeneity of variance. They typically involve parameters that define the population distribution, like means and variances. Examples include t-tests, ANOVA, and linear regression. Non-parametric tests, on the other hand, do not assume any specific