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# Math Study Guides

Get help with math by selecting the topic below that you're interested in learning more about. From pre-algebra to calculus we've got study materials to help you learn.

### Study Guides

showing 691 - 700 of 713
• 691.

#### Source Data and Sampling Frames Help

Introduction to Sound Data and Sampling Frames In the real world, data is gathered by a process called sampling. It's important that the sampling process be carried out correctly, and that errors of all kinds be minimized (unless the intent is to ...

• 692.

#### Random Sampling Help

Introduction to Random Sampling When we want to analyze something in a large population and get an unbiased cross-section of that population, random sampling can be used. In order to ensure that a sampling process is random (or as close as we can get), we ...

• 693.

#### Estimation Help

Introduction to Estimation—Mean In the real world, characteristics such as the mean and standard deviation can only be approximated on the basis of experimentation. Such approximation is called estimation. Estimating the ...

• 694.

#### Confidence Intervals Help

Introduction to Confident Intervals A distribution can provide us with generalized data about populations, but it doesn't tell us much about any of the individuals in the population. Confidence intervals give us a better clue as to what we can expect from ...

• 695.

#### Sampling and Estimation Practice Test

Review the following concepts if necessary: Source Data and Sampling Frames Help

• 696.

#### Assumptions and Testing Help

Introduction to Assumptions and Testing A hypothesis is a supposition. Some hypotheses are based on experience, some on reason, and some on opinion. A hypothesis can be ''picked out of the blue'' to see what would happen (or be likely to happen) under ...

• 697.

#### Statistics and Forecast Help

Introduction to Forecast Let's revisit the ''USA hurricane scenario.'' The predicted path for Hurricane Emma shown in Fig. 6-3 is a hypothesis, not an absolute. The absolute truth will become known eventually, and a path for Emma will be drawn on a map with ...

• 698.

#### Regression Help

Introduction to Regression—Paired Data Regression is a way of defining the extent to which two variables are related. Regression can be used in an attempt to predict things, but this can be tricky. The existence of a correlation between variables ...

• 699.

#### Hypotheses, Prediction, and Regression Practice Test

Review the following concepts if necessary: Assumptions and Testing Help

• 700.

#### Correlation Principles Help

Introduction to Correlation Principles Let's examine correlation a little more closely now. When two things are correlated, does one cause the other? Does a third phenomenon cause both? Is there any cause-and-effect relationship at all? People often conclude that ...

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