Thanks for the help as always SouthPaw!

10/23/2005 11:16:46 PM

Cheers southpaw, appreciate the help mate.

10/24/2005 4:38:28 AM

so what kinda shit did you guys get? i got 39/46. hes still very gay.

10/24/2005 12:40:19 PM

i dont think it matters what you got on the test.

everyone can agree he's still a bad teacher.



he was laughing when he went over the reasons people missed questions on the test

10/24/2005 12:59:54 PM

So, I'm mad as hell about my test, and I talked to some people and have decided that 10-20 of us need to speak to the department head of statistics. I am going to set up a time to meet with him sometime this week. His name is Sastri Pantula, email address is pantula@stat.ncsu.edu, and also I might talk to the director of undergraduate programs. If you have a problem with our teacher please try your best to attend this meeting time. The more people that show up the stronger the message that is sent will be.

The director of Undergraduate Programs is named Marcia Gumpertz. Her email address is gumpertz@stat.ncsu.edu, it probably wouldn't hurt to flood her inbox as well.

I will edit this post later today with the date and time of the meeting. Please do your very best to be there and bring any unhappy friends you have in the class. If we get enough we can basically shut down the statistics department until our problems are solved.

Ok, I called Dr. Pantula and the meeting is scheduled for 11am on Tuesday Oct. 25
Again please do your very best to be there, as this is the only time he has to meet with us.

[Edited on October 24, 2005 at 1:12 PM. Reason : meeting announcement]

10/24/2005 1:09:46 PM

I forgot to mention, the meeting is in 201 Patterson Hall.

10/24/2005 1:51:43 PM

Sadly I'll be square in the middle of a 400-level BUS course during that time, so I can't make it

10/24/2005 3:30:13 PM

I was talking to someone who had heard that if he have a petition signed by 25 people and present it to the dean, we can demand someone sit in the class and observe/correct his teaching methods.

I'm not sure if that's true or not, but it would be nice.

Unfortunately, I will be in class at 11 tomorrow. But I'll gladly sign anything you want to help back up your point during the meeting.

10/24/2005 3:36:40 PM

southpaw, thanks for the help. but i dont get what youre saying to do in #1 on the webassign. like how to put it in the calculator. just a little confused.

10/24/2005 4:59:15 PM

Yes, what exactly do you mean by "2nd +" in question 1?



Thanks Southpaw...give me that paypal account so I can put some money into it



[Edited on October 24, 2005 at 5:30 PM. Reason : ]

10/24/2005 5:27:30 PM

im not sure what he means by 2nd...

just do this


normalcdf(z score, 99) and it should spit out a p value

if its a two sided test then multiply it by 2


*note

For part b i have a negative z score but it is asking for the probability of a one sided test using a greater than sign.

In this case you need to do 1 - ans whatever your calculator spits out at you...

[Edited on October 24, 2005 at 5:36 PM. Reason : q]

10/24/2005 5:32:53 PM

glad I could help

There I just meant enter "E99" into your calculator. For those who dunno how to type "E" in there, hit the 2nd button followed by the comma button, or "2nd + ,"
Sorry that was unclear.

And I was j/k about the money, I'll need help one day from someone too. What goes around comes around

[Edited on October 24, 2005 at 5:33 PM. Reason : .]

10/24/2005 5:33:00 PM

the 'e' value is above the division sign rather than the + sign, at least on my calculator....


not to nitpick, the help is greatly appreciated




[Edited on October 24, 2005 at 5:41 PM. Reason : a]

10/24/2005 5:37:18 PM

^ True, but either work. That's the little lowercase e. I'm talking about the "EE" pictured above the comma button. I was just taught to use that one so that's what I posted...I guess either would work

10/24/2005 5:42:08 PM

Quote :

""2nd + , + 99""

okay the confusion was that people were hitting 2nd then the addition button....

while you mean hit the 2nd button THEN the comma button....

10/24/2005 5:51:55 PM

Ok, I'm a bit pissed.

On #11 (the confidence interval one) I had my answers completely correct, but I did them on my calculator. I was given 1/5 credit for that problem.

Is this something I should protest? He said that work must be shown for partial credit, and I took that to mean that if I wanted partial credit for a question that I got wrong, I would have to show my work. He didnt say we COULDN'T get the problems from the calculator, so why should I be penalized for knowing a shortcut?

I sure as hell could use those extra 4 points.

10/24/2005 11:36:30 PM

he did the same to me. i got a 3/5 for hardly having any work.

10/25/2005 12:13:28 AM

I WANT MY FUCKING POINTS

10/25/2005 8:16:26 AM

how did the meeting go today??

10/26/2005 1:04:17 AM

hey PackAngel23, whos that blonde girl that sits with you in the back? shes cute

10/26/2005 12:28:06 PM

yeah, how did the meeting go?

I wanna know if this BS is gonna change anytime soon

10/26/2005 3:24:04 PM

which one, they are both blonde. One wears her up alot and the other wears her hair down alot, then theres me.

10/26/2005 4:57:15 PM

pm

[Edited on October 26, 2005 at 8:31 PM. Reason : yea]

10/26/2005 8:30:25 PM

Can someone who knows what's going on give me some kind of explaination of the lab worksheet? I did it using the formulas etc...... but I didn't know exactly what the difference in the intervals was, and what the intervals are, b/c they're too low to be the number of homeruns.

10/27/2005 9:20:16 AM

I was looking over the practice test he handed out before the 2nd test and was looking over my cheat sheet, mainly because I was bored in class the other day. That's when I realized that he marked one of the practice test answers incorrectly right (13-b) when that was exactly what one of his slides said was wrong. Brought it up to him after class, he said he would "have to give some points back for that." So anyone who missed number 3 because they used the practice test to make your cheat sheet, hopefully we can get some points back for it. I'm emailing him a reminder just in case, but I expect him to mention it in class tomorrow.

10/27/2005 2:43:22 PM

whats the question for #3?

10/27/2005 6:58:26 PM

Thanks for the webassign help SouthPaW12. You're help is greatly appreciated since we have this ass hole for a teacher. I wish I would have seen this thread before and I would have been at that meeting for sure. This guy has to be the worst teacher ive ever had hands down.

10/28/2005 8:40:35 AM

Is anyone else worried that, based solely on their test scores, that they may not make the C wall for this class?

10/28/2005 9:41:09 AM

I have a problem with this class too ... honestly the only reason I believe I'm passing is because I've taken statistics before, but it was several years ago.

Someone let me know if you're getting up with the dept head again sometime - I have issues with the tests and with webassigns. I swear the damned things aren't worded right or are coded right or both.

10/28/2005 9:48:54 AM

Ok, how about a petition?

I'll write it if I have at least 25 guaranteed signatures. I think we'll need that many to really prove a strong point of how dissatisfied we are with this class.

10/28/2005 11:19:35 AM

^I'll sign it for sure.

10/28/2005 12:05:24 PM

me too, and I know of 2 other definite signitures

10/28/2005 12:06:31 PM

I dropped the class bc he sucked so bad. Ill sign it, just give me a place and a time.

10/28/2005 12:09:23 PM

What would we be petitioning? His teaching again or what? Because i know he isn't teaching again next semester

10/28/2005 1:23:44 PM

He isnt teaching again next year? That's awesome. How do you know that?

I'm thinking we would petition his teaching/testing methods and declare that we have not felt as if we learned/understood much of the material. We are also very concerned that because of his teaching, we will probably get low grades that highly misrepresent how much effort we put forth in the class. We could declare that it is extremely unfair to pay to learn, and then be "taught" by someone who can't and who doesn't listen to our concerns when we voice them. Then we could demand a change, whether it be a curving of all grades, money back on the course, or Reich being supervised for the rest of the semester.

10/28/2005 2:14:22 PM

Tracs doesnt have him teaching and I heard that Reiland is comming back.

10/28/2005 3:53:36 PM

Well aren't we an unlucky bunch.

It seems that he hates teaching here too, so maybe it was a mutual "peace out" between him and the university. Either way, no more students need to suffer through this guy, but we all should get A+'s just for dealing with it.

10/28/2005 4:32:23 PM

hopefully it means a huge curve at the end ...

10/28/2005 6:53:00 PM

or it could mean a big "fuck you, i hate NC state students and i'm gonna fail half the class"

10/29/2005 10:24:29 AM

Halloween WebAssign Help:

Problem 1:
a.) What you're trying to find here (Decision Rule) is:
Ho: u1-u2 <= to $0.25
Ha: u1-u2 > $0.25

a2.) For sp, just use the forumla given in the 10/28 slides...it's pretty long, so be careful using it. This can't easily be calculated on the calculator, so you'll hafta do it by hand. All the info. you need (your x-bars, sample st. devs., and n's (25 for each) are given already).

a3.) To find the t-test statistic, use the fomula given in the 10/28 slides as well. It's the difference in the two x-bars (for me is was $0.49), minus the number tested in your Ho ($0.25), all that divided by your sp that you just found multiplied by the square root of 1/n1 + 1/n2. Just follow the formula carefully. My t-test statistic was 1.02

a4.) Conclusion: Just find if your t-test statistic is greater or less than alpha, and if it's greater you fail to reject, if less you reject. Mine was greater, so I failed to reject.

a5.) All he wants you to say is something along the lines of the tests could have had other factors involved, so we may should've used a paired sample test to make sure the numbers were really independent.

Problem 2: This problem gives you all your data for x1 and x2, s1 and s2, and n1 and n2.
a.) This is from last chapter's stuff...just pretend you ONLY HAVE DATA for the American man (x1, s1, and n1). On your TI-83, go to STAT, Tests, and punch "8".
Make sure it's on "STATS". Enter your infomation, and set C-level to .95, and hit calculate. There's your confidence interval.

b.) Do the same but use your Canadian men data in the calculator.

c.) The point estimate is always u1-u2, or x1-x2 in our case. Mine was 182.1-173.6 = 8.5

d.) To find pooled st. dev., just use that same formula you used in Problem 1 to find sp. It's given on the slides from 10/28. No calculator help for this one, just do it carefully by hand.

e.) To find this, on your TI-83 go to: STAT, Tests, and punch "0". Now enter all your data, set the c-level to .95, and make sure Pooled says "Yes". Then calculate. WARNING: for some gay reason, WebAssign is marking the LOWER END of that confidence interval wrong incorrectly. It'll mark your high-end value correct, however. So, for now, just enter your high end value (mine was 16.013). I've emailed Reich and told him to check it out & make a change. I wasted a good hour trying to figure it out, when the whole time WebAssign was wrong

f.) To find this, on your TI-83 go to: STAT, Tests, and punch "4". Now enter your data (it may already be in there again), set u1: "=/u2" and make sure Pooled is "Yes", and calculate. There's your t-test statistic. Mine was 2.258

g.) If you t-test statistic is really high (>~2), you're definitely gonna get a p-value above alpha (0.5), so you reject. If your t happens to be real small, look it up and see if you'd not reject. For me, I entered "1" and it was right. Since you can only enter a "1" or a "0", and you have 3 submission, you're a complete fag if you miss this

Problem 3: For these paired sample confidence intervals, treat them EXACTLY like you treated making a C.I. for *just* the American men. It's just one set of data, so treat d-bar as if it were an x-bar, and sd as if it were sx.

a1.) On your TI-83, to find the C.I. of a single set of data w/ your st. dev. as a sample, go to: STAT, Tests, and punch "8" (for TInterval). Now enter your data and make sure you set your c-level to ".99". Then calculate, and enter your C.I. exactly as shown.

a2.) Interpret: Just say that you're 99% certain that your true difference in means lies within the range you just found.

b1.) Do the exact same steps as in a1.), except set your c-level to ".90"

b2.) Say the exact same thing except you're now 90% certain.

c.) This problem is pretty tricky. First off, you need to find the t-value for 90%. Look it up in your t-chart, and you're using 30 degrees of freedom. You get 30 b/c you are using a PAIRED sample, which means the n for each sample is the same. So if n=16, double that for 32. And in paired samples you always use (n-2), so (32-2) = 30 degrees of freedom. My t-value was 1.697.

Now, you know that your d-bar value is the value that goes as the 1st value in a C.I. before the +/-. My d-bar was: -4.6, so thus far I had: -4.6 +/- 1.697 (standard error)

Now to find that standard error. The standard error is always the denominator (bottom of fraction) in your T-Test Statistic formula (shown in the 10/28 slides). I'll give it to ya: sp*[sq. root of (1/n1+1/n2)]

First, to get this, compute your "sp" by hand, as you've done before. Take note,, the 2 samples he gives you are already squared, so don't square them again in that sp formula (I did that the 1st time, lol). Once you computer your "sp", simply multiple that by [(1/n1)+(1/n2)] to get your standard error that you'll plug into your Confidence Interval formula.

Although our numbers will differ, here's what I had just for visual's sake: -4.6 +/- 1.697(.088388) and my 90% C.I. became: (-4.749995, -4.45000).

c2.) For interpreting, just say something that the range in (c) was larger than the range in (b) due to (c) being computed as having indepented sample st. devs.


Now, just wait for Reich to correct that one error within WebAssign and you should be good to go.

God bless, and to all a good night

[Edited on October 30, 2005 at 6:29 PM. Reason : .]

10/30/2005 6:26:56 PM

^ It seems he fixed that error in #2, so go ahead & put both your high & low interval

10/31/2005 2:50:44 AM

Southpaw,
dude your the shit!!! we all owe you tremendously for the help.

bout Reich now, so if he's going at the end of the semester, maybe we should all be really nice to him and coax him into a BIG curve rather than express our true feelings (which are "hes an asshole") and risk him leaving us with a big "fuck you wolfpack bitches" that would result in 60% of us failing?

just a thought, though its incredibly hard for me to restrain myself form saying something nasty everytime i see that guy!!

10/31/2005 4:36:03 AM

I wonder if there's something we can do if 60% of the class actually ends up failing.

Because if a professor comes in, teaches for a year with HORRIBLE student criticism, and then leaves does that mean we're stuck?

If the university does that to us it's proving how little it cares about its students

10/31/2005 7:13:49 AM

Thanks SouthPaw.
And I talked to him in class Friday about the question he said he'd give points for, and he basically made up some crap about how the wording was "slightly different" bla bla bla. So much for that one.

10/31/2005 9:14:35 AM

i dont know how to do this lab. probably some formulas for it?

10/31/2005 12:29:44 PM

i keep getting question 1 wrong. my numbers are 1 = $3.75 2 = $3.22
s1 = $0.87 s2 = $0.81

i got 1.4858 for my sp but it says its wrong. any help as to what im doing wrong?

10/31/2005 12:53:57 PM

i took 350 over the summer, about killed me, but i made a B......also had a graduate student teaching it that made it a lil easier.....


I graduated in Dec 2003, seems there has been some turnover in the olde business school.

10/31/2005 11:01:20 PM

Southpaw, want to get paid to tutor this class in the future? PM me and I'll hook you up with folks on campus that would be interested in your skills.

11/1/2005 9:36:41 AM

anyone know what to use for the lab due tomorrow? formulas and shit?

11/1/2005 10:47:29 AM

or instead of paying SouthPaw to tutor the university could just find decent teachers and pay them so that 95% of the class doesn't need a tutor

11/1/2005 11:37:12 AM