Random sample

The Monte Carlo method is a technique that involves using random numbers and probability and running many iterations to solve problems which is analogous to gambling. When we increase the number of iteration, the output of the simulation will increase until we reached the number that increasing the number of iterations…

solution, because the measurements were susceptible to variations when read at eye level. The use of the pipettes to also deliver drops of a solution was also susceptible to slight inconsistencies and random error. An additional source of error included the boiling of water, where, as the unknown sample containing the two cations was being prepped for their respective parts, evaporated, decreasing amount of boiling water to an amount that was not levelled with the 4 mL of deionized water in a…

Although bacteria are often seen as something that is bad for you, it can also be good. In fact, it is in your stomach; it’s practically everywhere. To test the ubiquity of bacteria, my class and I conducted an experiment. We sampled random surfaces like ears, mouths, cell phones, soil, shoe, desk, bathroom door handles, and as our constant variable we left one side of our TSA plate blank. This should tell us whether or not our hypothesis is correct. My hypothesis was, “bacteria is found in…

design, one hypothesis is that people who report to have a steady career will also report to have lower or no levels of stress than those who do not have a steady career. To test this claim, thirty people from ages thirty to forty are recruited at random from a populous city because it harbors diverse populations. Happiness is the variable of a steady job, which has to meet the requirement of being employed for at least six consecutive months. Stress is measured in terms of a self-report survey…

the Social Communication Questionnaire and/or the child’s ABA center). Separate regression models will be specified for each daytime behavior outcome including: negative affect, aggression, self–injury, and repetitive behavior. Given the estimated sample size (target n = 40), these analyses will only detect robust effects (standardized regression effect size of .31 or higher) with power of .80. The proposed study will also use…

Hardy-Weinberg principles are used to express an ideal distribution of genotypes within a population as long as there is no mutation, no natural selection, the population is infinitely large, all mating is completely random, and there is no migration in or out of the population. In this experiment, the Hardy Weinberg equation will be applied to the class Alu genotype results to determine if the class population is in equilibrium. Cheek cell swabbing, PCR, and gel electrophoresis…

Context for Longitudinal Study Using Competing Risk Approaches Despite the fact that the effectiveness of RAAS inhibitors in the primary prevention of AF has been evaluated by several population-based observational studies [23-25], it is not clear whether the RAAS inhibitors remain effective in the reduction of new-onset AF in the older adult hypertensive population when competing risks (e.g. all-cause death) exist. All of these studies simply ignored the existence of the competing risks in…

Children were classified into four groups, those with: only high scores on the brief SDQ, only serious overall difficulties, both high scores on the brief SDQ and serious overall difficulties, and neither high scores on brief SDQ nor serious overall difficulties. Children’s characteristics, conditions, and service use in these four groups were compared. Data from the 2001–2007 National Health Interview Survey identified the emotional and behavioural problems, characteristics, conditions, and…

Hidalgo-Mendez and Amanda McMahon). The evaluators will examine the program that was piloted in two rural areas (Pasco and Prosser, Washington) and one urban (La Habra, California) with a total of 17 participants. This is a convenience sample, since the participants from the sample were selected based on naturally occurring groups and the data to be collected is conveniently available. Moreover, the participants were intensively…

The purpose of experiment A of exercise 1, is so that the students can observe Brownian movement. Brownian movement is the random movement of particles in a gas or liquid caused by the collision of molecules of the medium. This movement should be observed in the carmine slides by the irregular motion of the red pigment particles in the water solution. In experiment B of exercise 1,the students will investigate the process of osmosis and diffusion in a model membrane system and the effect of…