Compared mutation analysis method and multiple equilibrium theory by using IS-LM curve in statistical analysis of macro economy, and expounded the principles of Minsky moment by analyzing the real estate economy situation in China.

Adopted line chart form of statistical description to show the variation trend of interest rate of FRB before and after the financial crisis, and then explained the Minsky moment of America in 2008.

Made segmentation fitting to the interest rate changes from 1960 to 2007 in America by applying VAR model, and used Stata to implement relevant parameter estimation.

Compared the policies from Krugman, Taylor and Blinder about coping with financial crisis and proposed relevant policy suggestions and came to a conclusion that the Minsky moment hides in our side.

Collected data and research material and applied mathematical statistics to do case analy-sis on the phenomenon of child labor in many countries.

Made statistics to the number and percentage of child labor and analyzed the changes in gender and age.

Build mathematical modeling and analyzed the relationship between subsistence poverty and child labor.

Combined standard model with practical situations to reach the minimum wage condi-tions only needed for the adult.

Drew a conclusion by analyzing assumed data from Helena and Ducky that child labor problem has been an unavoidable natural phenomenon in poor countries.

Collected research results from Jensen and Nielsen, analyzed their academic papers and concluded that lower education is the main reason leading to child labor problems.

These statistical studies were aimed at college freshmen and comparison was done on college credit earned versus gender, high school GPA versus GPA in the first year of college and lastly, college GPA in the freshman year versus students graduate within six years or non-graduate. This topic focus on how the college freshmen engage in school and give insight of how well the students did in term of academic performance. 5,762 students were randomly selected from 130 colleges. There are three research questions were forms during the statically studies that were conducted.

The first research questions focus on gender proportion to number of credit hours are earned as college freshmen. Is there a significant difference in gender and credit hours that are earned in the first year of college at 95% confidence interval? The null hypothesis (Ho) stated that the population of female earned in student credit hours is equal to population of male earned in student credit hours. The alternative hypothesis (H1) stated that the population of female earned in student credit hours is not equal to population of male earned in student credit hours.

Some colleges select freshman candidates based on a student’s GPA during high school, but this may not be reflective of GPA obtained during their first year of college. Therefore, high school students with lower GPAs may end up with higher GPA in college. This lead to second research questions: is there a significant difference between high school students’ GPA and GPA during their first year in college at 95% confidence interval? Null hypothesis stated that high school GPA and College GPA does not differ. The alternative hypothesis stated a student’s college GPA during their first year will be significantly different than their high school GPA. Another consideration to look at college freshmen GPA is students graduate within six years. This give insight of students’ academic performance and how well the students finished college. This lead to the third research question: is there a significant difference in college freshmen GPA that graduate within six years or non-graduate?

The subcontractor we had working on the design of the gutters for the roofs of building has pulled out and our design constraints require that it be manufactured from a 12 inch wide piece of material. In order to carry a maximum amount of water, we designed the section shape of gutters can be rectangle, square ,triangle and semi-circle. We set the unit length be “a inch”.The length of roof section can be 12 inch. Therefore we can solve each volume of these sections’ shape with “a unit”. However, we can contrast the volume of them easily.

Human beings have the ambition to discover everything in this world so they are lured by curiosity to research the world. They want to research medical, biological, social sciences and also the human body. In ancient periods, people were curious to where we came from and what determined the appearance, characteristic, habit of human, animals and plants. At first, some people considered that God chose our appearance, height and personality. But in 1869，a swiss physician called Friedrich Miescher discovered through a substance the transmission of inherited traits from one generation to the next, and it is called Deoxyribonucleic acid(DNA). The first discovery of DNA marked the beginning of DNA technology. Later , in 1970s, scientists first began to clone and sequence DNA（(Clark,214）. People have already made use of DNA technology but they did not realize what it was. People tried to select efficient kinds of plants when they are planting. They usually select some plant which will grow a better quality of fruit. Then they use the seed of these plants and grow new fruits in the second year. They select high quality every years. Many years later, the farmer can harvest very high quality fruits for that year. This was a small use of DNA technology in ancient period even people did not know that it made use of the DNA technology. DNA technology sounds like is quite far away from human beings. But actually DNA technology is wildly used around everyone. The development of DNA technology has made a huge contribution to the medical ,biological and society fields.