Wednesday, April 30, 2008
(Interest Rate) x (Years to double) = 72.
Because I can't find today's slide so I don't remember the question we did so clearly. It was like: You invest your money in 2 ways: $1200 a year or $100 a month with the interest rate 6% in 1 year. Compare those 2 ways. Here is my answer for this question:
a) $1200 a year: b) $100 a month:
FV=alpha+solve = 1200 FV=1233.556
If you invest your money $100 a month , you will gain extra:
$1233.556 - $1200 = $33.556
Next scribe is Ari5
Tuesday, April 29, 2008
Monday, April 28, 2008
Sunday, April 27, 2008
Well for this unit I learnt how to properly use the protractor once again *laughs at self* I had forgotten how to actually properly use one=S but, luckily I slowly remembered how to and I've been doing alright for the questions. Good luck on the test tommorow guys going back to studying!
1 banana vs 1 apple
re-write 1 banana then below it write 1 apple. then all u have to do is figure it out 1 by 1. my strength pretty much if i get the wording, i can solve it right away- -so pretty much everything is okay, im just worried about the wordings for tomorrow. well goodluck guys!
So there's this girl(LOL). That's not my BOB. Anyways. Guys study for your test tomorrow. Do more problems. Go over all the problems that we did in class or homework. Make sure we all get it. Vector is one of the easiest unit but we still got to do our best to pass the test. Well, the part I didn't get in Vector unit is how to find the BEARING. But as I re-do all the problems we did then I'll be able to get it hopefully. The one thing I understood and liked about the unit is measuring. Using a scale and sketching on the paper and writing down the right degree. So, I think that's all for now. Good Luck on the Test tomorrow. Eat an energy bar(VECTOR) before you take the test to do well for the test. Alright laters mathers.
In this episode Timothy came back to school on Friday afternoon to talk about his week attending the miniUniversity program at the University of Winnipeg. He talks about the differences he finds between teaching and learning at high school and university and describes learning in the university classroom using a thought provoking metaphor, listen for it. Also, we have a cameo appearance by two very special people at the very end.
Please feel free to leave Tim_MATH_y your comments here on this post.
(Download File 7.2Mb, 15 min. 3 sec.)
Formulas you should remember (all found in April 22 slides):
- Sine Law
- Cosine Law
- Pythagoras Theory
- Properties of Angles
Another thing you should remember to use is, the TRISOLV2 program which can help you find angles and sides (TRISOLV2, April 23 slides). You can use the TRISOLV2 program to try to solve the question; you can also use it to help check your work. All in all goodluck to everyone on the test tomorrow.
This is wrong because the question is : "the ship NEED to travelin direction of 40 degree" , not "the ship to travel in direction of 40 degree ". So the resultant vector must be bearing 40 degree and the ship must travel with the vector which add the vector of current = the resultant vector ( we thought the ship travel in direction of 40 degree and is pushed by the current <== that 's wrong, the ship must keep its direction of 40 degree).
So the right answer must be :
Next scribe will be Carmel
Saturday, April 26, 2008
Friday, April 25, 2008
First Step: You are given an angle of 150 degrees and a magnitude of 550mph. Draw a Cartesian plane and then use a protractor to measure the angle of 150 degrees and draw a line for the first line.
Second Step: With the 2nd angle and magnitude given draw the line which is a bearing of 80 degrees and a magnitude of 175mph.
Third Step: Draw the Resultant vector by drawing a line from the tail of the arrow to the tip.
Fourth Step: Find the angles and sides you have and see what formula to use which in this case is the Cosine Law because you have a Side, Angle and Side.
Fifth Step: Square root the answer you got to get the answer by itself and not squared.
You step most the Fourth and Fifth step and just use the program "TRISOLV2"
Well this ends my Scribe post for today and the next scribe will be... CowMilk
Thursday, April 24, 2008
Wednesday, April 23, 2008
Tuesday, April 22, 2008
You can use Law of Cosine when you have Side Side Side (SSS) or Side Angle Side(SAS). Otherwise, you can use Law of Sine to solve the problems.
We also did an example by using Law of Cosine and Properties of angles. Here are the answers:
_ Magnitude of the resultant vector: 0.0644 N
_ The direction of the resultant vector: bearing 70.48 degree.
The next scribe will be ickie .
Monday, April 21, 2008
**SORRY YOU HAVE TO CLICK
THE PICTURES TO HAVE A BETTER LOOK AT IT**
As most of you should know, we had a substitute today for class.
We were given a worksheet to complete on vectors.
Here it is...
Tomorrow's scribe will be . . . . .
(unless someone would like to volunteer *evil stare*)
Sunday, April 20, 2008
Adding Vectors Using Scale Diagrams..
-A vector is represented by an arrow. Its LENGTH determines its magnitude and the tip determines direction.
The Triangle Method : Tip to tail.
The red: Is the resultant of the two vectors
The Black: are the vectors in which the arrow, connects to the
end of the second arrow(vector). Which is why it is called tip to tail.
Basically we measure using a ruler.
then measure the 2 end points to find the resultant of the two vectors.
The Parallelogram Method: Tip to Tail
The red: Is one vector and the other red one without the arrow is the mirror image on the other side.
The blue: is the other vector, with the same mirror image.
The green: is the resultant of the two vectors.
Now see how the two vectors tails connect, thats why its tip to tail.
the arrows show the directions each vector got copied from.
I don't see the big difference, the resultant is still the same as a the triangle method.
So all we use is a ruler to find the lengths, but if you wanna find the angles, you got to use a protractor.
This is basically what we learned because we had the afternoon off. The next scribe is C.J
Saturday, April 19, 2008
I was talking to Jessie earlier this week while helping her review over the lunch hour. I found her comments so compelling I asked her (and later her parents) if I could record and publish her comments so other students could hear what she had to say. I've long thought students need to hear from other students how they best learn to help them all learn.
This is the first in what I hope will be a series of podcasts called Student Voices. I'm hoping to have one of these short conversations with a student published each week. If you'd like to volunteer to be featured in one of these just let me know.
In this episode Jessie shares how she uses her class blog to learn and describes her personal "tipping point" from being confused to understanding Statistics very well. She also discusses the value of learning conversations and how sometimes being a "teacher" and sometimes a student helps her learn.
Please feel free to leave Jessie your comments here on this post.
(Download File 5.6Mb, 11 min. 40 sec.)
Friday, April 18, 2008
Wednesday, April 16, 2008
good luck to everyone tommorow.
I think that my strongest point is in the shadenorm(), i spent some time with it so it shouldnt give me any hickups.
This actually was a harder unit than i thought; at first i really didn't know the difference or how to use either normalcdf, or binomcdf. Later on, i learned that using binomcdf, means that the data is discrete (not involving decimals). Ie: you can't have half a person or half a light bulb. On the other hand, normalcfd deals with continous data (including decimals) aergo; questions like eating 1/5 of a sandwich can be done with normalcdf. Although i have some vague ideas on using these functions, i'll still have to review my notes. I also have to get reacquainted with using, InvNorm and ShadeNorm, since i forgot how to use them.... -_-"
In conclusion, study, study, study; i still want that 90%+ mark in this class. Goodluck to everyone.
+ Shapenorm(Low Value ,Hi value,mean,std.dev) but I think you guys should change to Z-score ^^ because that easier (I think) there's how to use shapenorm: shapenorm(Low Z-score,Hi-Z-score).
+ InvNorm(Percent) this one is easy to use ,when you have the percent ,just use this formula and u will get the Z-score,remember this percent must be from the minimum point at left of the bell Shape to right of the bell Shape .
+ And everyone must know how to calculate Z-SCORE
When binomial distribution approached to the normal distribution (np AND nq >= 5) we can use the formula of normal distribution.
+ binomialPDF(trial,percent,x) :
Ex: flip the coint 20 times
Trial --> we have 20 letters (H or T) --> trial is 20
percent--> 1/2--> trial is 1/2
The calculator will create 20 letters ( H or T)
X(optional of this formula) :if you don't put x , the calculator will show all of your results. (all the percent .If u put x = 5,the calculator only show 1 result ,that is the percent of exactly 5 letters in 20 letters.
+ binomialCDF(trial,percent,x) : the same with formula above, but it's have a LITTLE difference :P . When we put x=5 , the calculator will add all the percent from TTT(all of T)...or (All of H) to 5 letters H in 15 letters T (or 5 letters T in 15 letters H)
That's some things i think importance ...and ...that it ^^ ...GOODLUCK
MR.K when we hand in 4 questions ?????????
I just wanted to let you know that STATISTICS is the hardest unit in Applied Math 40S. So, now I need to study and analyze each problems that we did in class or as for homeworks to do better for the test tomorrow. Mr.K. has done everything he could to help us understand the concept of the following: normalCDF, normalPDF, binomPDF, binomCDF, ShadeNorm, and invNorm. But now it's our turn to apply that to the real world. That's why they called this course APPLIED MATH. Those are the keys we need to remember to be able to answer the test questions. And now I kinda understand what those functions mean. Just good luck to everyone and study and review your notes, problem questions, and quizzes to really help you succeed in the test. GOOD LUCK! Adios Amigos.
There is a link between the normal approximation and the binomial distribution and that is if np is greater than or equal to 5 and nq is greater then or equal to 5. We also learned that if the binomial distribution can be approximated by a normal curve then we can calculate the mean and the standard deviation:
mean=np standard deviation=square root of npq.
when we use the binomcdf function we check what the question tells us like if there are a certain amounts of items and the question wants us to find out how much more than another number then we use it but if the question asks us to find the exact amount then we use the binompdf. binomcdf adds up the data because the c stands for cumulative.
thats all I remember in class that day but next time I will make sure that I am ready.
Tuesday, April 15, 2008
as well all know this unit is a toughy and yes i'll admit it's not my favorite =\ but since i need a good mark on this test i wanna make sure i get through it in 1 piece. Maybe after i read over everything a few times it'll stick but as of right now i feel we've learned so much that it's in my head just floating around all unorganized. one of my most biggest weaknesses is identifying when to use normalc/pdf or binomialc/pdf.. i understand when to use either cdf or pdf but it's the normal or binomial that confuses me now.
ok i'm going to go on studying since................ MR. K. I GOT MY BINDER BACK! =)
Monday, April 14, 2008
Something that I thought was "cool" that I learned in class quite a while ago in this unit was that whole deal about a metre ruler or something. You know.. when Mr. K. asked another teacher to try to explain to us how a 1m ruler is made and such. It was very interesting and complicated.. but nonetheless "cooool" ya digg? So in the end, after that whole complicating, -and cool, explanation of golden rulers and everything, we learned that things are based on a STANDARD. Just like how rulers and measurements are (or should be) the same 'around the world'..
Thank you Mr. K. for taking that extra step to teach us in depth of rulers. xD
Oh and yeah.. I think this was how we were introduced to standard deviations.
I can't remember though.
Sunday, April 13, 2008
First, we did a quiz in the morning to test what we understand about normal and binomial distribution so far and here's the quiz that we did:
So, that was the quiz that we did in the morning and in the afternoon we did a problem about SOLVING THE BINOMIAL PROBLEM AS NORMAL DISTRIBUTION.
When to use:
normalpdf & binomialpdf = when a discrete data can't have a half a number.
normalcdf & binomialpdf = when a continuous data can have half a number
That's all I can do for the scribe for Thursday. Hope this helped some of y'all.
Next scribe will be chosen by DAVID.
Friday, April 11, 2008
Thursday, April 10, 2008
Wednesday, April 9, 2008
Tuesday, April 8, 2008
Monday, April 7, 2008
Sorry about putting this up a day late everyone! Well yesterday in class we went over the homework Mr.K had assigned us on tuesday. The 4th question that was done on the smartboard had 2 different ways to be solved. There was the long way to approach the question and a short way. I'll tell you how the long way went first. For the long way to solve the question we first had to find the z-score, second after finding the z-score you would use "normalcdf" which can be found on the TI-83 Plus by pressing the "2nd" function button then "VARS" to use the "DISTR" and then "1" to use "normalcdf".
This is the question: A college aptitude test is scaled so that its scores approximate a normal distribution with a mean of 500 and standard deviation of 100.
(a) Find the probability that a student selected at random will score 800 or more points.
Here's how the long way of looking at this question would look like below:
The shorter way is to just simply use normalcdf and input these numbers below:
normalcdf(800,1000, 500, 100) = 0.001349
The reason why you put put these numbers in one go is because normalcdf would find the z-score while also finding the probability of a student selected at random would score 800 or more points in one go which does the exact same thing as the long way does.
The next question that goes with the last question could also be solved in two ways.
Here's the question.
(b) Find score x,such that 76 percent of the students have a score less than x.
Here's the long way of how to look at this question and solve it.
invnorm(0.76) = 0.7063
Mark = 500 + 70.63 = 570.63
Here's the short way of how to look at this question and solve it.
invnorm(0.76,500,100) = 570.63
X = 570.63
Don't forget to put x = 570.63 because if you don't some people wouldn't know what the number is and thus would have a mark deducted away from you.
That's all that we did for the class we did on Thursday March 27, 2008.
Today for class in 3rd period Mr.Kuropatwa gave us our assignments, quizzes and tests back. Mr.Kuropatwa then talked about the learning tree with us which led to our project of the semester. The project is to create 4 of our own problems, which you can work with a partner or 2 partners but, if you work with a partner you would have to do 5 problems and 6 problems if you have 2 partners. The project is due sometime in June or so but, for the break Mr.K wants to have the questions by the friday we come back. For this assignment given to us for the break we can copy someone else's problems. The project with the due date in June has to be created from your ideas and from scratch. The site that our project will be posted on is http://expertvoices08.blogspot.com
That's all we did for class on Friday March 28, 2008. We didn't have our 5th period class of the day because of the activity for Spirit week in the afternoon.
Also sorry for the like late scribe everyone-_- Some reason my last post I did on Saturday didn't work and well no one told me it wasn't up until I went to check the site myself. Won't be in class today though, because of an appointment I have.
The next scriber will be.. mercee