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Bài viết của Lê Thị Khánh Huyền

Complex Numbers

The study of mathematics continuously builds upon itself. Negative integers, for example, fill a void left by the set of positive integers. The set of rational numbers, in turn, fills a void left by the set of integers. The set of real numbers fills a void ...

Tác giả: Lê Thị Khánh Huyền viết 15:50 ngày 25/05/2018 chỉnh sửa

Independent and Mutually Exclusive Events

Independent and mutually exclusive do not mean the same thing. Two events are independent if the following are true: P ( A | B ) = P ( A ) P ( B | A ) = P ( B ) P ( A AND B ) = P ( A ) P ( B ) Two events A and B are independent ...

Tác giả: Lê Thị Khánh Huyền viết 15:50 ngày 25/05/2018 chỉnh sửa

The Tradeoff between Economic Output and Environmental Protection

The tradeoff between economic output and the environment can be analyzed with a production possibility frontier (PPF) such as the one shown in [link]. At one extreme, at a choice like P, a country would be selecting a high level of economic output but very ...

Tác giả: Lê Thị Khánh Huyền viết 15:50 ngày 25/05/2018 chỉnh sửa

Test for Homogeneity

The goodness–of–fit test can be used to decide whether a population fits a given distribution, but it will not suffice to decide whether two populations follow the same unknown distribution. A different test, called the test for homogeneity , can be used to ...

Tác giả: Lê Thị Khánh Huyền viết 15:50 ngày 25/05/2018 chỉnh sửa

Test of Two Variances

Another of the uses of the F distribution is testing two variances. It is often desirable to compare two variances rather than two averages. For instance, college administrators would like two college professors grading exams to have the same variation in ...

Tác giả: Lê Thị Khánh Huyền viết 15:49 ngày 25/05/2018 chỉnh sửa

How Economists Use Theories and Models to Understand Economic Issues

John Maynard Keynes One of the most influential economists in modern times was John Maynard Keynes. (Credit: Wikimedia Commons) John Maynard Keynes (1883–1946), one of the greatest economists of the twentieth century, ...

Tác giả: Lê Thị Khánh Huyền viết 15:48 ngày 25/05/2018 chỉnh sửa

Data Collection Experiment

Class Time: Names: Student Learning Outcomes The student will demonstrate the systematic sampling technique. The student will construct relative frequency tables. The student will interpret results and their differences from different data ...

Tác giả: Lê Thị Khánh Huyền viết 15:48 ngày 25/05/2018 chỉnh sửa

The Structure of Costs in the Long Run

The long run is the period of time when all costs are variable. The long run depends on the specifics of the firm in question—it is not a precise period of time. If you have a one-year lease on your factory, then the long run is any period longer than a ...

Tác giả: Lê Thị Khánh Huyền viết 15:48 ngày 25/05/2018 chỉnh sửa

Introduction to Trigonometric Identities and Equations

A sine wave models disturbance. (credit: modification of work by Mikael Altemark, Flickr). Math is everywhere, even in places we might not immediately recognize. For example, mathematical relationships describe the transmission of images, ...

Tác giả: Lê Thị Khánh Huyền viết 15:48 ngày 25/05/2018 chỉnh sửa

The Exponential Distribution

The exponential distribution is often concerned with the amount of time until some specific event occurs. For example, the amount of time (beginning now) until an earthquake occurs has an exponential distribution. Other examples include the length, in ...

Tác giả: Lê Thị Khánh Huyền viết 15:48 ngày 25/05/2018 chỉnh sửa

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Complex Numbers

Independent and Mutually Exclusive Events

The Tradeoff between Economic Output and Environmental Protection

Test for Homogeneity

Test of Two Variances

How Economists Use Theories and Models to Understand Economic Issues

Data Collection Experiment

The Structure of Costs in the Long Run

Introduction to Trigonometric Identities and Equations

The Exponential Distribution

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