Stag Moose - Facts and Figures

Stag Moose - Facts and Figures Name: Stag Moose; also known as Cervalces scotti Habitat: Swamps and woodlands of North America Historical Epoch: Pleistocene-Modern (2 million-10,000 years ago) Size and Weight: About eight feet long and 1,500 pounds Diet: Grass Distinguishing Characteristics: Large size; thin legs; elaborate antlers on the males About the Stag Moose The Stag Moose (which is sometimes hyphenated and capitalized differently, as the Stag-moose) wasnt technically a moose, but an overgrown, moose-like deer of Pleistocene North America equipped with unusually long, skinny legs, a head reminiscent of an elk, and elaborate, branched antlers (on the males) matched only by its fellow prehistoric ungulates Eucladoceros and the Irish Elk. The first Stag Moose fossil was discovered in 1805 by William Clark, of Lewis and Clark fame, at Big Bone Lick in Kentucky;Â   a second specimen was unearthed in New Jersey (of all places) in 1885, by William Barryman Scott (hence the Stag-Mooses species name, Cervalces scotti); and since then various individuals have been unearthed in states suchas Iowa and Ohio. (See a slideshow of 10 Recently Extinct Game Animals) Like its namesake, the Stag Moose led a very moose-like lifestylewhich, if you dont happen to be familiar with mooses, entailed wandering swamps, marshes and tidelands in search of tasty vegetation and keeping a close eye out for predators (such as the Saber-Toothed Tiger and the Dire Wolf, which also inhabited Pleistocene North America). As for the most distinctive characteristic of Cervalces scotti, its enormous, branching horns, those were clearly a sexually selected characteristic: the males of the herd locked antlers during mating season, and the winners earned the right to procreate with females (thus ensuring a new crop of big-antlered males, and so on down through the generations). Like its fellow plant-eating megafauna mammals of the last Ice Ageincluding the Woolly Rhino, the Woolly Mammoth, and the Giant Beaverthe Stag Moose was hunted by early humans, at the same time as its population was restricted by inexorable climate change and the loss of its natural pasture. However, the proximate cause of the Stag Mooses demise, 10,000 years ago, was probably the arrival in North America of the true moose (Alces alces), from eastern Eurasia via the Bering Land Bridge in Alaska. Alces alces, apparently, was better at being a moose than the Stag Moose, and its slightly smaller size helped it to subsist on rapidly dwindling amounts of vegetation.

Understanding Scaled Scores on Standardized Tests

Understanding Scaled Scores on Standardized Tests Scaled scores are a type of exam score. They are commonly used by testing companies that administer high stakes exams, such as admissions, certification and licensure exams. Scaled scores are also used for K-12 Common Core testing and other exams that assess student skills and evaluate learning progress. Raw Scores vs. Scaled Scores The first step to understanding scaled scores is to learn how they differ from raw scores. A raw score represents the number of exam questions you answer correctly. For example, if an exam has 100 questions, and you get 80 of them correct, your raw score is 80. Your percent-correct score, which is a type of raw score, is 80%, and your grade is a B-. A scaled score is a raw score that has been adjusted and converted to a standardized scale. If your raw score is 80 (because you got 80 out of 100 questions correct), that score is adjusted and converted into a scaled score. Raw scores can be converted linearly or nonlinearly. Scaled Score Example The ACT is an example of an exam that uses linear transformation to convert raw scores to scaled scores. The following conversation chart shows how raw scores from each section of the ACT are transformed into scaled scores.   Raw Score English Raw Score Math Raw Score Reading Raw Score Science Scaled Score 75 60 40 40 36 72-74 58-59 39 39 35 71 57 38 38 34 70 55-56 37 37 33 68-69 54 35-36 - 32 67 52-53 34 36 31 66 50-51 33 35 30 65 48-49 32 34 29 63-64 45-47 31 33 28 62 43-44 30 32 27 60-61 40-42 29 30-31 26 58-59 38-39 28 28-29 25 56-57 36-37 27 26-27 24 53-55 34-35 25-26 24-25 23 51-52 32-33 24 22-23 22 48-50 30-31 22-23 21 21 45-47 29 21 19-20 20 43-44 27-28 19-20 17-18 19 41-42 24-26 18 16 18 39-40 21-23 17 14-15 17 36-38 17-20 15-16 13 16 32-35 13-16 14 12 15 29-31 11-12 12-13 11 14 27-28 8-10 11 10 13 25-26 7 9-10 9 12 23-24 5-6 8 8 11 20-22 4 6-7 7 10 18-19 - - 5-6 9 15-17 3 5 - 8 12-14 - 4 4 7 10-11 2 3 3 6 8-9 - - 2 5 6-7 1 2 - 4 4-5 - - 1 3 2-3 - 1 - 2 0-1 0 0 0 1 Source: ACT.org The Equating Process The scaling process creates a base scale that serves as a reference for another process known as equating. The equating process is necessary to account for differences between multiple versions of the same test. Although test makers try to keep the difficulty level of a test the same from one version to the next, differences are inevitable. Equating allows the test maker to statistically adjust scores so that the average performance on version one of the test is equal to average performance on version two of the test, version three of the test and so on. After undergoing both scaling and equating, scaled scores should be interchangeable and easily comparable no matter which version of the test was taken.   Equating Example Lets look at an example to see how the equating process can impact scaled scores on standardized tests.  Imagine that say you and a friend are taking the SAT. You will both be taking the exam at the same test center, but you will be taking the test in January, and your friend will be taking the test in February. You have different testing dates, and there is no guarantee that you will both take the same version of the SAT. You may see one form of the test, while your friend sees another. Although both tests have similar content, the questions are not exactly the same. After taking the SAT, you and your friend get together and compare your results. You both got a raw score of 50 on the math section, but your scaled score is 710 and your friends scaled score is 700. Your pal wonders what happened since both of you got the same number of questions correct. But the explanation is pretty simple; you each took a different version of the test, and your version was more difficult than his. To get the same scaled score on the SAT, he would have needed to answer more questions correctly than you. Test makers that use an equating process use a different formula to create a unique scale for each version of the exam. This means that there is no one raw-to-scale-score conversion chart that can be used for every version of the exam. That is why, in our previous example, a raw score of 50 was converted into 710 on one day and 700 on another day. Keep this in mind as you are taking practice tests and using conversion charts to transform your raw score into a scaled score. Purpose of Scaled Scores Raw scores are definitely easier to calculate than scaled scores. But testing companies want to make sure that test scores can be fairly and accurately compared even if test takers take different versions, or forms, of the test on different dates. Scaled scores allow for accurate comparisons and ensure that people who took a more difficult test are not penalized, and people who took a less difficult test are not given an unfair advantage.