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Expert Teaching: High-quality instruction from Perplex co-founder James Mullen with clear explanations, worked examples, and exam tips.
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.
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.
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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SL 4.2
Datasets can be represented in frequency tables, with a row containing the values that exist in the data and a row containing the number of times each value appears.
The mean of frequency data can be calculated using the formula:
Note that n=i=1∑kfi is just the total number of points.
Example
Find xˉ without a calculator.
Using a calculator, find
The standard deviation
σx=1.33⇒ variance is 1.77.
The quartiles
Q1=2, Q2=4, Q3=4.
SL 4.2
Datasets can be represented in frequency tables, with a row containing the values that exist in the data and a row containing the number of times each value appears.
The mean of frequency data can be calculated using the formula:
Note that n=i=1∑kfi is just the total number of points.
Example
Find xˉ without a calculator.
Using a calculator, find
The standard deviation
σx=1.33⇒ variance is 1.77.
The quartiles
Q1=2, Q2=4, Q3=4.