Particle size distribution

a) The sample size in this survey should be large enough so that it can encompass the whole population. The sample size if too small can lead to misleading and inaccurate conclusions. The more people surveyed the more accurate the representation of the general population will be. b) 3% is an excellent random sampling because out of 17,000 people 3% would be 500 people, which is a fairly large sample size. c) The margin of era is .045 and the sample proportion…

A CTS has five parts: a study design specification, an input-output model, a covariate distribution model, a trial execution model and a trial analysis…

is scattered at all the topographic and environmental gradients. EG is restricted to hilly areas and higher concentrations are found in the southern parts of the islands while the moist deciduous forests are found in low lying areas with major distribution in the northern…

of these studies attempt to prove causation, it is impossible with a correlational design method. Regardless of a positive or negative correlation, it cannot be used to prove causation. In several of the studies there is a small sample size, or even a sample size that is not indicative of the entire population. Additionally there is no knowledge of whether or not the studies used a double blind technique. If a double blind technique is used there is no researcher bias. Without this technique the…

but most importantly, three factors - (i) a deep understanding key terms and fundamental principles (ii) identification of sampling technique for the sample (iii) the practicality or otherwise of using the sampling strategy for the study. Sample size estimation for any study is imperative, hence the seen to ensure that it is done appropriately (Patten, 2014). Too few participants result in an underpowered sample, while too many participants result in an overpowered sample (Pyrczak, 2010). To…

Single-case designs are useful when researchers want to examine an individual’s unique behavior rather than focusing on the behavior of a group of participants; this makes case experiments an optimal technique for both clinical and counseling psychologists as well as behavioral analysts. While the name implies that only one subject is being studied throughout the whole experiment, this design can accommodate several individuals; although, typically this design is not used on large groups of…

The opposition has focused on research looking into the empirical evidence the proponents present. In the research conducted by Trzesniewski, Donnellan, & Robins (2008), they evaluated the empirical basis of the research and findings of Twenge and colleagues(year), specifically the limitations of convenience sampling. The first issue raised involved their technique of cross-temporal meta-analysis, which compiles data from a questionnaire for an extensive number of years. With this concern…

Stress Management App Efficacy: The Impact on Negative and Positive Affect Do various stress management apps effect negative and positive affect differently? The present study consisted of a randomized comparative efficacy trial, which aimed to unveil whether three stress management applications differed in their impact on negative and positive affect. Participants completed a pre-test assessment of their experiences of various negative and positive affects. The pre-test assessment also…

The findings of this study on neurocognitive performance of high school athletes who incur multiple concussions suggest athletes with a history of 3 or more concussions are still impaired on cognitive tasks and concussion symptoms [6].The authors used a cohort study design, the IVs were concussion groups (0,1,2,>3), and time ( baseline, 3 days, 8 days), the DVs were neurocognitive test scores measured by Immediate Post Concussion Assessment, cognitive testing (ImPact), neurocognitive test…

“U.S. students suffering from Internet addiction: study Crackberry is no joke.” After assessing both the report and the study neither of these causal claim is warranted on the basis of this study due to problems with the representativeness, sample size, and the erroneous methodology…