How to Use the Systematic Sampling Method Assignment

How to Use the Systematic Sampling Method - Assignment Example According to the research findings, when dealing with two different groups within a population, the most appropriate sampling method to use is the stratified sampling method. Specifically, this technique is a modification of simple either random or systematic sampling styles, where the population is divided into two homogeneous subgroups. Afterward, the sample is selected using either of the techniques mentioned above. In applying these techniques in the given case, first I would divide the groups into male and females. For instance, if there are men 1800 men and that of females are 900. Carrying out the systematic sampling for the males would be 20 (n) = 1800 and female would be 10 (n) = 900. In my estimate, the number of men makes up two-thirds of the population and females equal to one-third of the population; therefore, sampling technique applied, in this case, is called a proportional stratified sampling method. The eleven threats to internal validity are Selection, Maturation, History, Subject Effect, Instrumentation, Treatment Replication, Subject Attrition, Presenting, Statistical Regression, Diffusion of Treatment, and Experiment Effect. A true experimental design compares two identical groups of randomly picked participants, and that is the experimental group and the control group. The experimental group is subjected to a certain intervention (s) while the control group is used to assess the changes in the experimental group. Specifically, the control group gives the validity of the research by confirming that the changes experienced or because of the intervention and not any other factor.

Paraphrase for Discussion Essay Example | Topics and Well Written Essays - 500 words - 4

Paraphrase for Discussion - Essay Example The general assumption is that the object’s convection is higher in a vertical stream as a result of the extra free convection where the temperature would be expected to drop fast. However, it has been tested that free convection would be rather negligible in magnitude to the forced convection. The main reason for this negligible magnitude can be attributed to the aspect of velocity in free convection compared to forced convection. A faster velocity can lead to more energy being transferred into the system as molecules come into contact with the surface of the object while forced convection is mainly concerned with molecules being constantly being forced to the surface. As such, it can be observed that there is a correlation between linear convection coefficient and fluid velocity as shown by the experiment. However, the main source of error in this experiment was related to the time of sampling of every five seconds of the swinging action of the objects in the airstream. The biggest error is witnessed in the spikes of data especially on the convection verse time figures. As the object moved from the main airstream, it lost speed and force due to the fact that there was less air molecules contacting the surface of the object and the result was a drop in the temperature of the object. The hardware to collect temperature can be cited as the main cause of the error in this experiment. In real terms, energy is lost through convection as well as well as reduction of molecules as the object move from the main airstream. Given that more energy is lost to convection, it can be noted that the convection coefficients will appear higher than what is actually obtaining on the ground. It has therefore been recommended that future experiments should ensure that temperatures are increased where the an extremely thermal resistive material has to be used in order to hold the object against swinging while in touch