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Descriptive Statistics
Watch comprehensive video reviews for Descriptive Statistics, designed for final exam preparation. Each video includes integrated problems you can solve alongside detailed solutions.
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Interactive Problems: Solve problems alongside the video with step-by-step guidance and detailed solutions.
Exam Preparation: Complete unit reviews designed for final exam preparation with all key concepts covered systematically.
Expert Teaching: High-quality instruction from Perplex co-founder James Mullen with clear explanations, worked examples, and exam tips.
Not your average video:
Interactive Problems: Solve problems alongside the video with step-by-step guidance and detailed solutions.
Exam Preparation: Complete unit reviews designed for final exam preparation with all key concepts covered systematically.
Expert Teaching: High-quality instruction from Perplex co-founder James Mullen with clear explanations, worked examples, and exam tips.
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AHL 4.14
The mathematical definition of variance, which the calculator is using under the hood, is
Here, xi are all the existing values in the dataset, and fi is the frequency of each value.
The standard deviation is thus simply the square root of this:
Example
Find the variance of the data [2,3,4,4,7].
First we find that the mean μ=52+3+4+4+7=4.
Then
AHL 4.14
The mathematical definition of variance, which the calculator is using under the hood, is
Here, xi are all the existing values in the dataset, and fi is the frequency of each value.
The standard deviation is thus simply the square root of this:
Example
Find the variance of the data [2,3,4,4,7].
First we find that the mean μ=52+3+4+4+7=4.
Then