Farewell Advanced Statistics!

         It was almost four months that we have dealt with the mind-winding problems of Advanced Statistics, but it really pays off if you will look in your report card seeing that the subject  that was once the lowest subject grade that you have last year was now even higher than the other subjects.

        Though it was a very good feeling that Stat was now done with us, there is still that feeling of a little bit of loneliness that we will miss this hard subject. We will miss the frequent use of calculators, which had been our greatest friend in Advanced Statistics, the scientific calculator which had been our help in every problem that we solved. We will also miss the waiting for the photocopies of our handouts to be given by the leader of the day, the times that we had to collect money/ pay money for the handouts, the times that we had to text or call one of our classmates because we had no idea of what are we going to do with an item that is included in the assignments and exercises. And of course we will miss our Advanced Statistics teacher – Ms. Kristin Macatigos, who will be married very soon.

      Everything in this world has its beginning and its end. Like  Advanced Statistics, we will be bidding goodbye to it, yet the lessons learned will be applied in some areas of our everyday lives, and the memories formed during the time that we’re still on it will be cherished!

Posted by: Kent Spencer Manalo Mendez

STATISTICS- All the Lessons for 2nd Grading

              Second Grading is finally over. We had just finished the Departmental test last October 17-18, 2012. We find it very difficult especially in the subject STATISTICS. But luckily we had all finished it. We had taken the test for almost 2-hours. The test is a 50-item test. I find it very confusing in finding the critical value because it's hard to identify what kind of statistical test will be use.

The Departmental Test include the following topics(all the topics for 2nd Grading):

* Z-test for Proportion

* Chi-square test for a Variance or Standard Deviation

* Testing the Difference between Two Means (Large Samples)

* Testing the Difference between Variances

* Testing the Difference between Two Means(small Samples)

* Testing the Difference between Proportion

* Correlation and Regression

* Test for Goodness of Fit

*Test Using Contingency Tables

* Analysis of Variance

          Even though the different statistical methods have different formulas, they still use the Hypothesis TESTING(Stating the hypothesis, Finding the critical value, Solving for the test-value, Making the decision, Summarizing the result). For me, Hypothesis Testing is the most important to statisticians.

By: Dustin Joshua A. Esquia III-Gold

Random Things- Oct. 15, 2012

Check this out....

By: Carl Joel E. Palma III- Gold

Testing the difference between two variances- Sept. 7, 2012

According to what I've learned...

Characteristics of F-distribution

-The values of F cannot be negative
-The distribution is positively skewed
-The mean value of F is approximately equal to 1
-The F distribution is a family of curves bases on the degrees of freedom of the variance of the numerator and the degree of freedom of the denominator.

Formula for F-test

Use of F-test
1. The larger the variance should always be designated as variance sub 1 and be placed in the numerator formula.
2. For a two tailed test, the alpha must be divided and the critical value be placed on the right side of the f curve.
3. If the standard deviations instead of the variances are given in the problem, they must be squared for the formula for the F-test.
4. When the degrees of freedom cannot be found in table H. the closest value on the smaller side should be used.

Assumptions for testing difference between two variances
1. The populations from which the samples were obtained must be normally distributed.
2. The samples must be independent of each other.

That's all...
By: Carl Joel E. Palma III-Gold