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Comparing population proportions 1 | Probability and Statistics | Khan Academy

By Khan Academy

For qualitative variables, the population proportion is a parameter of interest. A point estimate of the population proportion is given by the sample proportion. With knowledge of the sampling distribution of the sample proportion, an interval estimate of a population proportion is obtained in much the same fashion as for a population mean.

Solving Proportions

By Mathademics

Solving proportions

Shortcut to Solving Proportions

By Mathademics

Enjoy this quick shortcut on solving proportions!

Represent proportions by equations

By Khan Academy

Proportional relationships

Testing if Ratios are Proportional

By Khan Academy

Watch this video to learn a method to test if two (or more) ratios are equal. Equal ratios are called proportional. If the ratios can be reduced the same fraction in lowest terms then they are proportional.

Comparing population proportions 1 | Probability and Statistics | Khan Academy

By Khan Academy

Solving Similar Triangles and Proportions

By MrCaryMath

YouTube presents Solving Similar Triangles and Proportions, an educational video resource on math.

Identifying proportional relationships with graphs

By Khan Academy

Learn how to tell proportional relationships by drawing graphs. Key idea: the graph of a proportional relationship is a straight line through the origin.