When to use univariate descriptive
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This document discusses univariate descriptive statistics including mean, median, mode, and standard deviation. The mean is the average calculated by summing all values and dividing by the total number. The median is the middle value when values are arranged from lowest to highest. The mode is the most frequently occurring value. Standard deviation measures how much scores deviate from the mean and is the most common measure of variability.
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A measure of the central tendency is a value about which the observations tend to cluster.
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A measure of the central tendency is a value about which the observations tend to cluster.
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A measure of the central tendency is a value about which the observations tend to cluster.
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A measure of the central tendency is a value about which the observations tend to cluster.
In other words it is a value around which a data set is centered.
The three most common measures of central tendency are mean, median and mode.
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To summarize the data.
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It is the arithmetic average of a set of numbers, It is the most common measure of central tendency.
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Applicable for interval and ratio data
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Mean is calculated by adding all values in the data set and dividing the sum by the number of values in the data set.
Median:
Mid-point or Middle value of the data when the measurements are arranged in ascending order.
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Arrange the observations in an ascending order.
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This document provides definitions and explanations of key statistical concepts including:
1. Statistics is defined as the science of collecting, classifying, presenting, and interpreting data. Central tendency measures like mean, median, and mode are used to summarize data.
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While the mean is most commonly used, the median and mode are better in some situations, such as when outliers are present or data is categorical. The geometric mean measures rate of change over time. Choosing the appropriate measure depends on the data type and distribution.
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This slideshow explains the important measures of central tendency in statistics. It deals with Mean, mode and median; its characteristics, its computation, merits and demerits. This slideshow will be useful to students, teachers and managers.
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When to use univariate descriptive
- 1. Uni-variate Descriptive Dr. Molly Joy Professor and Head, Department of Psychology , Kristu Jayanti College Bangalore
- 2. When to Use a Particular Statistical Test – Uni-variate Descriptive Mean • the mathematical average • the formula is ∑X/N ex:mean marks obtained for Physics = mark of person one + mark of person two + mark of person three, etc. / number of people
- 3. Median Median • the center value • the formula is N+1/2 ex:6 students with marks in Physics 21, 22, 24, 23, 19, 21 put them in order form lowest to highest 19, 21, 21, 22, 23, 24 and take the center value =21.5 N+1/2= 6+1=7 /2 = 3.5th score = 21+22= 21.5
- 4. Mode the most commonly occurring value ex: 6 people with marks 21, 22, 21, 23, 19, 21 - mode = 21
- 5. Standard Deviation how much scores deviate from the mean it is the square root of the variance it is the most commonly used measure of spread or dispersion