## Statistic: Study Design

As you all might probably know what Khan Academy is, I won’t go in detail about this learning source. Mainly, Khan Academy is a free online source, build by expert-creators, that provide free online courses, lessons, and practices; where students able to freely learn anything from different levels.

This school year I encountered a class that became one of my enemy but also a best friend. My math teacher provided me with two statistics’ books; textbook and workbook. In addition to the learning resource, my math teacher introduced the class to a course in Khan Academy called Statistics and Probability. Statistics and Probability is a giant course but the Khan make the course easier by break them down into a list of unit including: analyzing categorical data, displaying and comparing quantitative data, summarizing quantitative data, modeling data distributions, exploring bivariate numerical data, study design, probability, counting-permutations-and combinations, random variables, sampling distributions, confidence intervals, and significance tests (hypothesis testing). Therefore, the study design is my favorite

Based on the skill I have mentioned above, not every unit was hard as it sounds and not every unit was easy as it pronounced. Therefore, the study design was one of my favorite and challenger. Study design unit was categorized into discrete skills such as: comprehend statistical questions, perceive sampling and observational studies, recognize sampling methods, and discover the type of studies (experimental vs. observational). I have learned that the experimental/research/study design is much more than a statistic. Experimental, research or study design is the core of good research exploration. With the obligation of all of these skills, I understand that it will guide me in every experiment with good data collection, discover statistical analysis, and capable of interpreting the results. I believed in the fact that proper sampling method, collecting data, investigating results, and writing report properly will serve a path for the reader to identify the study design.

## Chapter 3: Example Relationships

Moving on to chapter three in statistic textbook, we learned about the relationship of scatterplots, correlation, and the least-squares regression. The scatterplot is the most common and effective way of showing the relationship between the two quantitative variables. On the scatterplot display one variable of the horizontal axis (the X-axis), and another variable appears on the vertical axis (the Y-axis).  In the horizontal axis, we usually plot the explanatory variable (independent variable) and response variable (dependent variable) on the vertical axis. Correlation is a type of statistical measure that includes two or more variable shift together. Correlation is also a strategy that shows how strong the variables are related. Regression line or line of best fit that are being plotted in the scatter graph is shown to display a relationship that can possibly be used in order to predict the values of one variable as a guide to finding another unknown variable.

## Getting familiar with unit circle

After two weeks of SAT Boot Camp, we are back to our regulars essential classes. For this round in math class, we focus on getting ready for the real SAT. We practiced the different set of problems and lessons. In the first earlier week, my classmates and I came across Unit Circle; which most of us already have some background knowledge about it. The unit circle feels overwhelming at first but as soon as Jeff teaches me the trick, the unit circle is not that stress to work with.

## Using Khan Academy as a learning tool

Khan Academy is a free Online Courses, Lessons & Practice. Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere. I use Khan Academy to practice my math by practicing the exercise and watch the video tutorials. I also use this online course to practice my SAT test. On Octuber 14, I did my first Pretest SAT. My score was unexpected and I’m glad to use this website as my learning tool.

## Independence math

In this class, we learn math by myself and try to improve our skill by Khanacademy. We have one hour to work on this with the friend. I like this class because I got to choose which topic I could improve on my math and I have some alone time to focus on it. I love Khan Academy website because it has many topics for me to choose. It gives a lot of good tutorials and very good strategy to solve a math problem.