Learning outcomes of Statistics for Managers Research Paper

Learning outcomes of Statistics for Managers - Research Paper Example It is important for people to put statistics in practice even if they do not understand statistical methods well (Anderson, Sweeney & Williams, 2011). Descriptive statistics are numbers that are used to explore data in a more meaningful way such that a person can understand the data with no need of explanation. In descriptive, data more explained in such a way that images or patterns may emerge from the data presented. This helps those that cannot read and understand what the data means to study the image or patterns well so that they can be able to understand the data well. Descriptive statistic is of more importance if the data was to presented in a raw data it could be difficult for some of us to understand the data especially if one has a lot of data to go through. According to Leblanc (2004), descriptive statistics enables people to present their data in a more meaningful way for easy interpretation of the data. For example, a certain number of students in school sit for an exam then their teacher want to take the overall performance of those students. He or she will have to apply descriptive statistics to get the overall of his or her students. Inferential statistics is more concerned in making inference or predictions of a give population through analyses and observation of the sample. In inferential statistics the data is generalized together as opposed to descriptive statistics where data is more interpreted in a meaningful way. As such, analysts can take the results obtained from an analysis using a study sample, and then generalize this information for use in the larger population represented by the sample. Silverman (1986), argues that it is imperative to use a representative sample of the group being generalized in order to achieve this fete effectively. Some of the key tests of significance considered under the issue of generalization include a T-test or a Chi-square, which explores the probability of the results

Current and Future trends in Microelectromechnical Systems Case Study

Current and Future trends in Microelectromechnical Systems - Case Study Example cessing, and data acquisition features."[2] The term MEMS refer to the devices that are on a millimetre scale with micro-resolution. It is the integration of mechanical elements, sensors, actuators and electronics on common silicon substrate through the utilization of microfabrication technology [8]. There are several broad categories of MEMS fabrication technologies. They are Bulk micromachining, Surface micromachining, LIGA, Deep reactive ion etching and the integrated MEMS technologies. The brief [9] of each of the technologies is given below Bulk micromachining is a fabrication technique which builds mechanical elements by starting with a silicon wafer, and then etching away unwanted parts, and being left with useful mechanical devices [9].'The advantages are less cost high reliability, manufacturability, and good repeatability [9]. Surface Micromachining builds devices up from the wafer layer-by-layer [9]. Surface Micromachining requires more fabrication steps than Bulk Micromachining, and hence is more expensive.' It is able to create much more complicated devices, capable of sophisticated functionality. LIGA is a technology which creates small, but relatively high aspect ratio devices using x-ray lithography [9]. Unlike traditional Bulk Micromachining, which uses a wet chemical etch, Deep Reactive Ion Etching micromachining uses'a plasma etch to create features allowing greater flexibility in the etch profiles, enabling a wider array of mechanical elements [9]. Since MEMS devices are created with the same tools used to create integrated circuits, in some cases it is also possible to fabricate Micro-machines and Microelectronics on the same piece of silicon [9].' LITERATURE REVIEW MEMS has a very wide range of applications, particularly of its sensors which are used many of the automotive, medical and other consumer products. The technology development is immense and there are several in the literature to quote from in evidence of this fact. The MEMS related technology and literature work is very huge and hence effort has been made only to cover the key developments from random authors. One technique developed in the United States at the University of Wisconsin uses thin film polysilicon for the sensor diaphragm [3]. The polysilicon devices are correspondingly smaller and hence they cost less. Another technique, result in much smaller sensor dies than standard bulk micromachining techniques NovaSensor in the United States, employs high temperature fusion bonding of silicon wafers to form inward tapering cavities under single crystal silicon diaphragms [4]. These devices are used in medical catheters. An improvement in low pressure measurement has also been suggested as by using advanced MEMS micromachining