Psy 540 Research Methods In Psychology Paper

Research Methods in Psychology

PSY 540
September 9, 2013
Instructor:

Research Methods in Psychology
Descriptive statistics give us a way to sum up and express our data but do not allow one to make a judgment related to ones theory. When delivering a test of diversity there are two primary techniques of sum up the data using descriptive statistics. The primary direction to measure the central tendency for two conditions (mean, median or mode.) The second technique to show date is to calculate and measure dispersion; these measurements will show the extent of a data set. Dispersion can also be measured by calculating the range. The range difference is show in a set of scores by the order of the smallest to the largest.
According to Applied Research Question., (2013), “A true experiment is when an experiment may be completed by chance or by random assignments. This is when a true experiment is capable of being labeled a true design. True experiment design requires more than one target formed group,” common measured result(s), and random assignment. “Ethnicity and sex do not satisfy this requirement since they cannot be purposively manipulated in this way” A true experimental designs transpire when the sample are randomly appointed to a comparison and planed groups. If the test being conducted may be completed by random assignments, this experiment program is capable of being considered a true design (Applied Research Questions., 2013). How are threats to internal validity controlled by true experiments? True experiments are directed by constricted range of the evaluation purposes the true experiment is addressing. Some threats to internal validity can occur “when the control group can be involuntarily be exposed to the program: such a threat also occurs when key aspects of the program also exit in the comparison group” (Applied Research Questions., 2013). How are true experiments in psychology different from experimental designs? True experiment is used to show cause and affect relationships and differs from experimental designs in the way the ethnicity, the population, and sex are designed and differ. The internal validity is threatened when the researcher’s
According to (Applied Research Questions, (2013) “Quasi-experimental design in psychology is a firsthand plan or design to estimate the casual impact of an intervention on the population being targeted,” Why are quasi-experimental designs important in psychology? These quasi- experimental designs are vital or important because of Randomization. These types of experiments allow the most reliability and validity of statistical estimates of treatment effects. These experiments are vital especially in experimental design and survey sampling (Applied Research Questions., 2013). How are quasi-experimental designs different from experimental design in psychology? According to Applied Research Questions, (2013), “In science randomized experiments are the experiments that allow the greatest reliability and validity of statistical estimates of treatment effects. Randomized based inference is especially important in experimental design and in survey sampling. Quasi-experimental designs are commonly employed in the evaluation of educational program when random assignment is not possible or practical.” Quasi experimental designs are posttest only and non-equivalent only. For instance, if a researcher wants to investigate the variations between two groups of learners who will study various topics, one group will study writing and one group will study grammar. At the end of this learning program, the pupils of both groups will have to pass