they suffered during the war‚ in 1917 British physician Charles Myers coined this reaction as Shell Shock. It was thought that shell shock was due to the result of being close to exploding shells. Today though‚ Shell shock is called Post-Traumatic Stress Disorder (PTSD). This change of name happened in 1970 after the Vietnam War. PTSD is essentially the same as Shell Shock but PTSD is a more precise than Shell Shock was. PTSD is now considered a common psychological disorder which can occur to a person
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Body Composition Body composition is the proportion of fat‚ muscle‚ and bone in the body. There are many methods to know someone’s body composition and body fat percentage such as measurement with calipers‚ underwater body‚ fat test‚ the bodpod‚ DEXA scan and bioelectrical impedance analysis. (Kravitz‚ Len‚ Ph.D. & H. Heyward‚ Vivian‚ Ph.D.). The calipers method involves measuring the skinfold thickness of the layer of fat just under the skin in several parts of the body with calipers. The
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sure you can be. It is expressed as a percentage and represents how often the true percentage of the population who would pick an answer lies within the confidence interval. The 95% confidence level means you can be 95% certain; the 99% confidence level means you can be 99% certain. Most researchers use the 95% confidence level. When you put the confidence level and the confidence interval together‚ you can say that you are 95% sure that the true percentage of the population is between 43% and 51%
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Calculating Sample Size Types of Samples Subjective or Convenience Sample - Has some possibility of bias - Cannot usually say it is representative - Selection made by ease of collection Simple Random Sample - No subjective bias - Equal chance of selection; e.g.‚ select the fifth chart seen on every third day - Can usually be backed to say it is representative Systematic Sample - Is a random sample - Equal chance of selection due to methodology; e.g.‚ computer-generated list of
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Egg Osmosis Lab Introduction What is osmosis? Osmosis is a very important part of biology. It is the spontaneous passage of water or other solvents through a semipermeable membrane. A semipermeable membrane is one that blocks the passage of dissolved substances. Osmosis occurs when there is an imbalance of solutes outside of a cell versus inside the cell. A solution that has a higher concentration of solutes than another solution is said to be hypertonic‚ and water molecules tend to diffuse into
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Investigating How Concentration of Acid Affects the Reaction Between Calcium Carbonate and Hydrochloric Acid Introduction ============ According to the collision theory temperature‚ concentration‚ surface area and catalysts all affect rates of reaction as shown in the diagrams below. Increasing any of these should increase the number of collisions and so increase the reaction rate up to an optimum point. Increasing the temperature causes the particles to collide with more
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BASIC ELECTRICITY TEST TEST INFORMATION PAMPHLET WHY DO AT&T AND ITS AFFILIATES TEST? When individuals are being considered for our available job openings‚ they go through a selection process to measure their knowledge‚ skills and abilities to determine if they can perform the jobs in a satisfactory manner. It is to the advantage of both you‚ as a job candidate‚ and the company that only those who can perform at acceptable levels be placed on the job. Research has shown that tests provide accurate
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Phuong Pham Prof. Johnson Lab 3 Gravimetric determination of Calcium as CaC2O4.H2O Feb‚ 27‚ 2014 I. Objective: The purpose of this lab is to determine how well gravimetric method measures the calcium level in a solution of known calcium concentration. II. Method: a) Overview: In this lab we will prepare 25 mL known concentration Calcium solutions. Then we will use Gravimetric method to determine the concentration of Calcium in each solution to figure out how well this method is. As we know
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that contributes in the pollution in our environment. Banana peels‚ egg shells‚ rice grains‚ spoiled meals are examples of food waste and this includes the raw material that will be used in the study‚ oyster shells. Oysters are commonly consumed‚ cooked or raw‚ by humans as a delicacy but the shells of it are usually thrown away and that’s the reason why oyster shells are one of the most common household garbage. Oyster shells are abundant in tropical countries especially in the Philippines where
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CHAPTER 1 INTRODUCTION 1.1 INTRODUCTION Calcium is the largest mineral in the human body‚ where it plays an important role in absorption and the releasing of calcium in the body is through the intestinal and kidney. The calcium in the body is controlled by hormones and vitamins (Takano et al). The three major components that involve in the controller the calcium is parathyroid hormone (PTH)‚ calcitonin and Vitamin D. The consistent the calcium in the body from despite variation in-take and excretion
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