Random sample

the mechanical, chemical or electrical properties of the chosen materials. In this work, the prepared samples are studied using various techniques given below. • Powder X-ray diffraction(PXRD) • Ultraviolet –Visible spectrometry(UV) • Scanning electron microscopy(SEM) • Energy dispersive X-ray spectroscopy(EDS) 1.8.1 Powder XRD analysis (PXRD) The structural information of the prepared samples is examined through powder X-ray diffraction. X-ray crystallography is a tool, which is used to…

systems regularly to make sure they follow the standards that the PCAOB set up. For the auditors of public companies, the PCAOB implements a risk-based approach to assess audit engagements. The inspection uses high-risk samples to evaluate an auditing firm instead of random samples. There are some criticisms about this risk-based approach. For example, this method may not represent a firm’s average audit quality since it focusses on some difficult audits (Church and Shefchik, 2012). However, I…

This was obtained through pipetting a DNA sample into a well in a gel electrophoresis apparatus. After running the sample under UV light, the AMY1A and actin gene were measured with the use of the Bio-Rad Imaging Software. The dependent variable in this experiment was the salivary amylase concentration. The salivary amylase concentration was obtained through various procedures including, PCR reactions to amplify the DNA, measuring wave frequency of a DNA sample using a spectrophotometer, and…

Public Opinion Poll Essay A Gallup poll was conducted by the Gallup Daily tracking survey on a sample population of parents living in the US and Columbia district. The poll aimed at appraising the education sector in America. The poll showed America’s opinions concerning topics inclusive of the quality of K-12 education, common core state standards, online higher education sustainability, and standard of reverence for U.S teachers (Ogisi & Saad, 2014). Common Core State standard remains an…

Stratified random sampling allows us to stratify the population by criterion then choose a random or systematic sample from each stratum. Stratified sampling ensures the sample is distributed the same method as the population. This is essential in minimising instances of population bias that could affect the findings. The questionnaire is distributed…

Introduction Eating disorders (EDs) refer to a group of conditions characterized by abnormal eating habits. They involve either insufficient or excessive food intake that is detrimental to an individual’s physical and emotional health. (1,2) EDs are among the potentially lethal psychiatric illnesses, and are predominately represented by a mental effect of preoccupation with body weight, shape and diet. In addition, eating disorders frequently occur with other psychiatric disorders…

A set of serial dilutions is made from water sample collected, a sample of each is placed into a liquefied agar medium, and the medium poured into a petri dish. Dilutions are designed in order to make the calculation of the number of cells/ml in the original sample easier. The most common dilutions are 1/10, 1/100, and 1/1000. After incubation, agar plates with 30-300 colonies are counted. Greater than…

chromosomes in each cell (bar the gametes) and each chromosome contains a single long strand of DNA with thousands of genes and millions of nitrogenous base pairs1. For this report I will be focusing on the genetics of height whilst examining a sample of 351 students. Height is an example of continuous variation where traits ‘are not one of two discrete characters, but…

They were selected from specific areas and sapling was random. Though there is no detail of the recruitment, the paper suggests that the main consideration was where the subjects lived, their occupation, their commuting distance (people who worked from home were mot selected) and a willingness to participate…

Q1) What type of reinforcement schedule does random drug testing represent? Is this type of schedule typically effective or ineffective? The type of reinforcement schedule that random drug testing represents is the Variable-Interval(VI) schedule of reinforcement. In Variable Interval schedule a response is rewarded after an unpredictable amount of time has passed. This type of schedule is done randomly and is unexpected. The word random used in this case itself represents the schedule. Variable…