Summaries of current topics can be found below the homework details.
Tuesday, 9/18
Work three of the problems that you set up last night and in class today. ALSO, do problems 2.41, .42, and .43 completely.
What more do you need in order to be successful with this? Make a list! Outline the important concepts from the chapter!
Why is the normal distribution such a big deal?
Monday, 9/17
Select 15 problems from Chapter 2. Split your paper in half (hotdog style). Write the details of the GIVENS on the left and the items that the problem asks you to find on the right side. You do not have to solve the problems. Watch carefully for those cases where there are multiple requirements.
Your test is Thursday.
Wednesday, 9/12
UPDATE: I have posted a WORD document with hints on the homework site: classhomework.com. You'll have to enter the password and then click on the file name.
Post to the blog and let me know when you get it--but don't ruin the fun for the other students!
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You KNOW that the area under the curve in a probability distribution is always one (That's why you get 1 when you use normalcdf(-infinity, +infinity)). Go back to the first parts of Chapter 2 and review the characteristics of a probability distribution.
Then, for HW, find the values of x which represent the Q1, median, and Q3 of a triangular probability distribution that starts at the origin and ends at (4, ???). Yes, you have to figure out what the value of ??? is so the are under the curve is 1.
You will use the formula for the area of a triangle: A = (1/2) base * height.
There are many different ways of attacking this problem. How many can you find???
Tuesday 9/11
HW 2.24, 2.25, 2.30
If you don't understand something, ask a question on the blog. Coming to class unprepared is not an option.
Monday 9/10
HW 2.15, 2.16, 2.22, 2.23
Friday 9/7
You developed equations today to standardize observed values.
Your formula for the z-score was (observed x minus the average)/(standard deviation).
You also used a formula to find the value of x that has a certain z-value:
x = average value + (z-score)(standard deviation)
but you probably noticed that the second formula is redundant.
You also learned about the Empirical Rule.
http://www.stat.tamu.edu/~west/applets/empiricalrule.html
This ONLY WORKS with normal distributions and it is only an approximation. We will learn more precise methods next week.
If you're interested in a neat relationship that works for other types of distributions, check this out: http://www.stat.tamu.edu/stat30x/notes/node33.html
Another neat website:
http://people.hofstra.edu/stefan_waner/Realworld/Summary7.html
Now, is anyone out there planning to CiCi's this Sunday? I won't go unless there is interest, so post your plans!
HW: 2.6, 2.7, 2.8 and read up to that point in Chapter 2. Be safe.
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7 comments:
Mrs. Linner i am having some trouble with the homework tonight 9/12 and i'm getting a little behind, i was wondering if i could come in early sometime around 7:45 or so to get some help.
I have to help with a staff development activity tomorrow, so let's see if we can get you on track right now, OK?
Were you able to find the value of y that makes the area under the curve = to 1?
how do u find the value of y that makes the area under the curve = to 1 and when they say the area under the curve is that lyk the are within the curve in between the horizontal axis and the curve itself?????? :(
We know the formula
(1/2)(base)(height)= area.
We have the base (4) and the area (1). We solve for the height.
But you knew that. :)
I can't get to classhomework.com.
Is the website down?
what is the password to download the review document off of classhomework.com?
lassitermath
Keep working at it, kids! You have what it takes.
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