background preloader

Science

Facebook Twitter

My DMT Experience (FelipeSparx29) Part 1of 2. My DMT Experience (FelipeSparx29) Part 2 of 2. Dice Simulator - Random Dice - Dice History. The Unity of Geometry. Visitor information, teacher workshops, public programs in Fort Davis, Texas. Your Sky. By John Walker Welcome to Your Sky, the interactive planetarium of the Web.

Your Sky

You can produce maps in the forms described below for any time and date, viewpoint, and observing location. If you enter the orbital elements of an asteroid or comet, Your Sky will compute its current position and plot it on the map. Each map is accompanied by an ephemeris for the Sun, Moon, planets, and any tracked asteroid or comet. A control panel permits customisation of which objects are plotted, limiting magnitudes, colour scheme, image size, and other parameters; each control is linked to its description in the help file.

Your Sky provides three ways to view the sky with links, where appropriate, among the various presentations. Sky Map The sky map shows the entire sky as viewed from a given location at a specified time and date. Horizon Views Horizon Views, showing the stars above the horizon as seen from a specified observing site at a given date and time. The Virtual Telescope Your Sky help Related Software. Magnifying the Universe. Embed this infographic on your site!

Magnifying the Universe

<iframe width="500" height="323" scrolling="no" src=" frameborder="0" allowfullscreen></iframe><br />Copyright 2012. <a href=" the Universe</a> by <a href=" Sleuth</a>. The above is an interactive infographic. We have also developed a complimentary poster that you can view here: Sizes of the Universe poster. If you're technically inclined, here's a look at the references we used to construct these infographics: Facts About The Universe. Introduction: This interactive infographic from Number Sleuth accurately illustrates the scale of over 100 items within the observable universe ranging from galaxies to insects, nebulae and stars to molecules and atoms. While other sites have tried to magnify the universe, no one else has done so with real photographs and 3D renderings.

How To Use: Space and NASA News – Universe and Deep Space Information.

Distance Between Cities

Populations and Samples. The study of statistics revolves around the study of data sets.

Populations and Samples

This lesson describes two important types of data sets - populations and samples. Along the way, we introduce simple random sampling, the main method used in this tutorial to select samples. Population vs Sample The main difference between a population and sample has to do with how observations are assigned to the data set. A population includes all of the elements from a set of data. Depending on the sampling method, a sample can have fewer observations than the population, the same number of observations, or more observations.

Other differences have to do with nomenclature, notation, and computations. A a measurable characteristic of a population, such as a mean or standard deviation, is called a parameter; but a measurable characteristic of a sample is called a statistic. What is Simple Random Sampling? A sampling method is a procedure for selecting sample elements from a population. Technology. Think. Types of Mathematical Averages and Their Formulas. In mathematics, the average of two or more numbers is called the mean.

Types of Mathematical Averages and Their Formulas

The most commonly used mean is called the arithmetic mean, in which you add up all the values and divide by the number of values. For example, the arithmetic mean of 2, 5, and 14 is (2+5+14)/3 = 7. However, there is more than one kind of mean, including the geomtric mean, harmonic mean, root mean square, and several others. The essential property of any mean is that it must fall between the highest value and the lowest value. When computing means, the type of mean you need to use depends on the type of data you are analyzing. Geometric Mean The geometric mean of two numbers x and y is sqrt(xy).

(x1·x2·...xn)1/n Business analysts and scientists use the geometric mean to find the average growth rate of a process. Sqrt[(1.25)(1.458)] = sqrt[1.8225] = 1.35 Thus, the average growth rate over the two years was 35%. Harmonic Mean In science in business applications, the harmonic mean is used to average ratios. Other Means. Ten Most Extreme Substances Known to Man. Your Sky. Visitor information, teacher workshops, public programs in Fort Davis, Texas.