Sampling and Sampling Distributions

The aims of this study include: (1) analyzing the PAHs concentration in chicken egg samples; (2) evaluating the PAHs distribution in the albumen and yolk; and (3) estimating the exposure risk to human health via chicken egg consumption.

8p viyoko 01-10-2024 0 0   Download

This paper investigates the influence of intergranular friction and grain size distributions on the initial void ratio of a granular sample subjected to isotropic compression loading. In the field of geomechanics, besides the loading path and evolution of microscopic properties, the initial void ratio is a crucial and key factor that governs the mechanical behavior of geomaterials.

10p vifaye 20-09-2024 3 1   Download

The sediment quality assessment showed that trace element concentrations were lower than the limited values in the sediment quality guideline (QCVN 43:2017/BTNMT). According to the Igeo index, the sediments were not polluted by Cu, Pb, Zn, Cr, Fe, and As but were likely polluted by Hg and Mn in some sampling sites. Therefore, it is necessary to invest the future studies to assess the Hg and Mn concentration levels in these sites to protect the marine environment.

12p dianmotminh02 03-05-2024 9 2   Download

The objective of this study was to investigate the distribution and prevalence of gastrointestinal parasites in wild free ranging peafowls living in Virudhunagar and Tirunelveli districts of Southern Tamilnadu, through cross-sectional survey. A total of 72 freshly voided faecal samples were collected randomly from wild free ranging peafowls of either sex and of different age groups and were examined by direct faecal smear; flotation and sedimentation techniques to detect parasitic oocysts and/or eggs.

6p gaocaolon9 22-12-2020 15 2   Download

At a temperature of 300 K, both Ni and Cu atoms are crystallized into the face-centered cubic (FCC) and the hexagonal close-packed (HCP) phases, respectively. The mechanical characteristics of the sample at 300 K were also analyzed in detail through the determination of elastic modulus, number of atoms, and void distribution during the tensile process.

8p tamynhan5 10-12-2020 15 3   Download

In this paper we study the development of handwriting ability of primary school students by investigating the number of errors appearing in their transcription. More precisely, 1557 primary school students were asked to copy a paragraph in a period of time and then the errors in their samples were collected and statistically analyzed.

10p tamynhan5 10-12-2020 17 1   Download

A study on species composition and density of polychaete (Polychaeta) was investigated in mangrove eco-system, Da Loc commune, Hau Loc District, Thanh Hoa province. Samples were collected in April, July, and November, 2010, from cross-sections of Len estuary and mangrove forests. A total of 15 polychaete species, belonging to 11 genera, 9 families and two groups of settlers (Sedentaria) and mobile (Errantia), were recorded in the study areas.

8p tamynhan9 02-12-2020 14 2   Download

The object (for students) in this course is: To learn how to interpret statistical summaries appearing in journals, newspaper reports, internet, television, etc; to learn about the concepts of probability and probabilistic reasoning; to understand variability and analyze sampling distribution; to learn how to interpret and analyze data arising in your own work (course work or research).

6p koxih_kothogmih1 03-08-2020 24 1   Download

In order to distribute earnings to shareholders, besides cash dividend, the firms can also buy back shares. However, compared to cash dividends, share repurchases are less common. Therefore, the thesis only focuses on cash dividend policy of the firms. Specifically, the thesis studies the dividend payment policy of 460 firms listed on HSX and HNX between 2010 and 2016. The data is collected from 2009 to 2017. The data needed for research is extracted from the Datastream database. The final sample includes 2,653 firmyear observations.

27p kequaidan6 15-07-2020 20 1   Download

The descriptive survey research design was used for this study. The sample size for this study included three hundred and twenty-five (325) staff of the Nigerian Ports Authority.

8p guineverehuynh 19-06-2020 18 2   Download

The objective of this article is to determine if companies located in Cameroon manipulate their earnings to avoid publishing low losses. Based on a sample of 1,525 companies observed over a three-year period and using statistical tools such as normality histograms and statistical tests, we arrive at the results below. First, we note that there is indeed a discontinuity in the distribution of corporate earnings at the threshold of zero.

19p tociitocii 24-04-2020 8 0   Download

For hundreds of years, business people have been transmitting their wisdom generation to generation. In the middle 1990’s companies started to create units focused in managing their knowledge. Nowadays, Knowledge Management is still a relatively new discipline focused in developing the main competitive advantage that organizations have: the intellectual assets. Organizations recognise that Social Media can be enormously used to influence their customers. However, they exactly do not know how to confront this new tool.

87p nguyenyenyn117 18-06-2019 43 6   Download

The sepiolite support possesses fibrous structure. X-ray diffraction analysis pointed out that the TiO2 particles are firmly distributed on fibrous sepiolite matrix. All TiO2/sepiolite samples were tested for the degradation of rhodamine B and showed a high catalytic activity. The experimental data showed that the degradation efficiency of rhodamine B is correlated with the amount of TiO2 loadings and oxidant behavior. At room temperature, the conversion of rhodamine B reaches to 99-100 % over 6.0 wt% TiO2/sepiolite catalyst.

5p giesumanh 10-11-2018 57 1   Download

Enrico Fermi (1901–1954) took great delight in astonishing his colleagues with his remarkably accurate predictions of experimental results. . . his “guesses” were really derived from the statistical sampling techniques that he used to calculate with whenever insomnia struck!

92p tranthanhkhang93 19-04-2017 34 4   Download

Chapter 7 - Sampling and sampling distributions. This chapter includes contents: Random sampling; the sampling distribution of the sample mean; the sampling distribution of the sample proportion; stratified random, cluster, and systematic sampling (optional); more about surveys and errors in survey sampling (optional); deviation of the mean and variance of the sample mean (optional).

12p whocare_b 05-09-2016 54 1   Download

Chapter 8 - Confidence intervals. After mastering the material in this chapter, you will be able to: Calculate and interpret a z-based confidence interval for a population mean when σ is known, describe the properties of the t distribution and use a t table, calculate and interpret a t-based confidence interval for a population mean when σ is unknown,...

12p whocare_b 05-09-2016 44 2   Download

Chapter 10 - Comparing two means and two proportions. After mastering the material in this chapter, you will be able to: Compare two population means when the samples are independent, recognize when data come from independent samples and when they are paired, compare two population means when the data are paired, compare two population proportions using large independent samples.

13p whocare_b 05-09-2016 47 2   Download

In this chapter, students will be able to: Learn the financial and statistical issues in the determination of sample size, discover the methods for determining sample size, gain an appreciation of a normal distribution, understand population, sample, and sampling distribution, distinguish between point and interval estimates, recognize problems involving sampling means and proportions.

25p allbymyself_06 28-01-2016 50 2   Download

The lecture "Applied statistics for business" provides students with the knowledge: Introduction to the Course, Course Materials, requirements for Students, Main Contents. Invite you to refer to the disclosures.

8p doinhugiobay_13 26-01-2016 59 2   Download

In the Pt/
-Al2O3 catalysts, the distribution of uniform, small particle-size Pt metal on the carrier with high surface area of metal will result in high catalytic activities and will economize noble metals. The distribution of metal depends on the technology of preparation and postpreparation. The influences of the impregnating, drying, calcining and reducing on the distribution of metal have been studied using by physic methods, scan electronic microscope (SEM), transmission electronic microscope (TEM), and the hydrogen distribution has been measured by the method of hydrogen absorption.

5p uocvong01 24-09-2015 55 6   Download