Correlation and Association Research Paper Example | Topics and Well Written Essays - 250 words

Correlation and Association - Research Paper Example On the other hand, the correlation coefficient measures the strength and direction of a relationship by utilizing the geometric relationship of the dependent variable Y with the independent variable X. It is defined as â€Å"the measure of association between two interval variables† (Willnat, Manheim and Rich, 2011), also known as the Pearson product-moment correlation. This coefficient predicts the values of Y according to that of the corresponding values of X. Because of its higher accuracy and efficiency in predicting values of association between variables, the correlation coefficient is still reliable even when the samples to be used in the test vary in size. Since the coefficient of association relies mainly on a specific sample size on guessing the measure of association instead of the whole population, the test for statistical significance is stronger using the correlation coefficient. The latter can accurately predict the association between variables based on any subgroups of a population, hence making it a reliable tool in any given statistical data

Brain Wave Genereation :: essays research papers

Theory behind BrainWave Generator EEG and the brain's state EEG (Electroencephalography) technology is used to measure brain's electrical vibrations from the surface of the scalp. The resulting EEG pattern will contain frequency elements mainly below 30Hz. The frequencies are categorized into four states as follows: State Frequency range Amplitude State of mind Delta 0.5Hz - 4Hz high (up to 200uV) Deep sleep Theta 4Hz - 8Hz low (5uV - 20uV) Drowsiness (also first stage of sleep) Alpha 8Hz - 14Hz high (up to 200uV) Relaxed but alert Beta 14Hz - 30Hz low (less than 10uV) Highly alert and focused The dominant frequency in the EEG pattern determines what shall be called the current state of the brain. If the amplitude of the alpha range frequencies is highest, then the brain is said to be in the alpha stage. Note, that other frequencies still exist and it is impossible to give any "exact frequency your brain is operating on". However, later references to the brain states use the simplification of assuming that such a single frequency exists. Entraining the brain to a desired state If external stimulus is applied to the brain, it becomes possible to entrain the brain frequency from one stage to another. For example, if a person is in beta stage (highly alert) and a stimulus of 10Hz is applied to his/her brain for some time, the brain frequency is likely to change towards the applied stimulus. The effect will be relaxing to the person. This phenomenon is also called frequency following response. When the brain's state is close to the applied stimulus, entrainment works more efficiently. Thus, when doing a sweep from one frequency to another, the starting frequency should be as close to your current brain state as possible. The sweep speed should be such that your brain's state changes steadily with it, so that the difference never gets very large. In practice, it is difficult to determine your brain state without extra equipment (like EEG devices). However, you can quite safely assume that during the day your brain is in the beta stage (about 20Hz) and you can start the sweep from there. If you are already somewhat relaxed, you can use a start frequency of 15Hz or a few Hz lower. Stimulating the brain with binaural beat frequencies The easiest way of applying stimulus to the brain is via ears. Other senses could be used as well, and vision is actually used quite often (often in addition to hearing).

Memory Cost Essay

Over the past 30 years the cost of Electronics has steadily decreased. The cost of electronic storage has decreased greatly over the past 30 years as well. In this paper I will be talking about the decrease in the cost of RAM and Hard Drive Storage, how much will a 100TB HDD will cost when it becomes widely available in the future, and how much memory I will be able to buy with $100 in 10 years. In 1956, IBM created the first commercial Hard Drive called the IBM 305 RAMAC which held 5MB and cost a whopping 50 thousand dollars! Electronic storage started being more widespread during the early 1980’s, but it wasn’t until the 1990s that RAM and Hard Drive Storage begin to be cheap enough for the average person. Back in 1981 the price for one MB of Hard Drive storage space was $340! Most people couldn’t afford a computer back in the 1980’s because of the huge cost. Through the 1980’s the cost per MB fell from around $340 during 1981 then to $40 per MB i n 1988, and finally to $9 per MB in 1990. The cost of one Bit of ram in 1981 was 0.000425 cents, in 1988 it was 0.000005 cents, in 1995 it was 0.000000158 cents, in 2000 the cost per Bit was 0.000000063, and in 2013 the cost per Bit was 7.9Ãâ€"10^-10 cents. To get an understanding of how much memory will cost in the future and when 100TB hard drives will become commercially available, we have to take a look at how the price for memory has gotten cheaper over the past 10-30 years, the ever increasing amount of storage space that can be squeezed onto a hard drive platter, and take in to account the rapid growth in the technology field. According to Chris Mellor in his article (http://www.theregister.co.uk/2013/11/01/hp_memristor_2018/) technology giant HP announced that 100TB hard drives could be available as early as 2018. I firmly believe that in 4 years by 2018 there will be 100TB drives for sale to the public but they will probably be very expensive till they go into mass production. In 10 years, we will be able to buy a hard drive with a phenomenal amount of storage space. From 1990 to  2014 the price has gone down exponentially from $9 per MB to under 150 MB per Cent! If we follow that exponential trend we are looking at hard drives that can hold over 100TB that cost fewer than 100 dollars, while the RAM will decrease in price slower. In conclusion, the cost of Storage such as RAM and Hard Drives has gotten very cheap, from over $500 per MB to 5 cents per GB! We will see a continual decrease in the cost of electronic storage and an increase in the amount of storage in smaller packages. Picture Citation: http://www.aei.org/publication/chart-of-the-day-the-falling-price-of-memory/ Citations http://ns1758.ca/winch/winchest.html http://www.theregister.co.uk/2013/11/01/hp_memristor_2018/ http://www.jcmit.com/memoryprice.htm

A Christian At The Age Of 14 - 1409 Words

Author Information: (see attached resume for additional information) I became a Christian at the age of 14, partly as a result of being taught evolution in public school. Learning about evolution made me very unsettled. I reasoned that if evolution were true, then my life was a result of a series of random accidents and therefore my life had no purpose. I heard a clear gospel presentation and trusted Christ as my savior as a freshman in high school. Since that time, I have had an avid interest in the scientific evidence that proves the biblical creation account true and evolution false. I worked for 35 plus years as a hydrologist with the U.S. Geological Survey (USGS). Initially, as a research hydrologist studying the quantity and quality of river water. I later moved into water science management positions and lastly served as an executive responsible for the all the surface-water related activities of the USGS in the U.S.A. As an executive, I was also designated as the Delaware River Master. As River Master, I administered the provisions of the 1954 U.S. Supreme Court Decree allocating the waters of the Delaware River. My career with the USGS has provided me with a wealth of education and experience in all aspects fresh-water related science and science management. During my career with the USGS, I authored or co-authored about 40 scientific and lay reader reports, proceedings paper, and abstracts. Since becoming a Christian, I have had a keen interest in scientificShow MoreRelatedContemporary Christian Music Essay902 Words   |  4 Pagesin music. I went from contemporary Christian to listening to almost anything and everything. Now I listen to Christian metal, pop and rock. Contemporary Christian music now that I have discovered Christian metal and all the other genres of music sounds plain and boring I cannot stand to listen to it. 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Similar grammatical and stylistic structure. d. Common theme prominent in both booths such as, love, light, life, abide, darkness, eternal life, new commandment, the Word, beginning, believe 98 times in the gospel, nine times in the epistle, witness thirty eight times in the gospel, six times in the epistle. e. Evidence in both books that the author personally knew Jesus (1 John; 1:1-4 and 4:14). The author makesRead MoreTurning Men Into Fishing Is A Popular Past Time All Around The World1277 Words   |  6 Pagesworld. It has been around for many centuries, and has influenced and shaped many societies and cultures. One popular religion that fishing has a major impact on is Christianity. It is obvious that fishing is prominent in the Christian religion by looking at the famous Christian symbol, the Jesus fish. On many American cars one may find this very simple depiction of a fish on the back bumper. Another influence that fishing has in Christianity is the teachings in the bible. Many biblical stories are