Stats Definition and 227 Threads

There is so much variation amongst statistics majors across schools. I think it is the major that varies the most. This is surprising, since statistics is math. A big reason for this is that sometimes it is offered from math department, and others from the business department (stern's stats...

If business degrees require only intro to stats class that contains no calculus, and stats could be summarized into a short, easy, one semester course, are taking calculus-based statistics courses after intro to stats helpful for decision making, or are the calc-based stats courses merely just...

Homework Statement In a 52 card deck, if you draw 5 cards find the probability of drawing exactly one ace. Homework Equations (n k) = n!/k!(n-k)! P(A) = |A|/|S| The Attempt at a Solution So I took the logic of a different example we had that stated it like this - If we have 5 options but...

Homework Statement Let A and B be two events such that P(A) = 0.4, P(B) = 0.7, P(A∪B) = 0.9 Find P((A^c) - B) 2. Homework Equations I can't think of any relevant equations except maybe the Inclusion Exclusion property. P(A∪B) = P(A) + P(B) - P(A∩B) This leads us to another thing P(A∩B^c)...

http://oi58.tinypic.com/2d85aix.jpg above is an url to the stats major program at my school. In red are the two classes that overlap. Is it likely that the overlap is intended, or a typo? Do universities ever allow such overlap (an emphasis class overlaps with a core class)? They changed it a...

is comp sci minor worth it for stats major? Does it significantly boost value on the labor market? Is it worth an extra year of school? Also, I'm 22 and feel left behind from my peers, who have graduated.

Could you please list and elaborate as much as you can on schools that are heavy on the theoretical side of statistics? Thank you as I have to have my applications in by December-January for grad school (I plan to enter a PhD program and would like guaranteed funding).

Question Find the posterior probability that the next two observations y4 and y5 will both be zero? Where the prior distribution is a gamma with parameters (a,b) and the sample is of size of 3 taking from a poisson disribution with parameter V. So far I have shown that the posterior...

Hey guys, nice to meet you all! My name is Jonathan and I'm from Queensland Australia. I'm currently working on a project which is seeking to find the most accurate method to value an asset based on historical stats. I think the best way to describe would be to provide a theoretical example: I...

< Mentor Note -- thread moved to HH from the technical math forums, so no HH Template is shown >[/color] Hi everyone, Got a stats question here from my revision material, but I am not sure if I've answered the whole question or not...

Hi, I will be majoring in Statistics at SFSU. However, while the curriculum is that of an Applied Statistics major (below is a link to a chart of the three offered emphasis, which we must choose one of out of ). Why, then, does the school call it "Statistics" instead of "applied Statistics"? And...

till now i used the normal method for finding out the mode of a given data that is just simply look for the most frequently occurring observation and label it as the mode. But recently I have encountered another method for finding out the mode in which it was also stated that my old method for...

I am beginning a second undergraduate degree this fall and am trying to decide on a major but don't think I have enough information to discriminate between my top two choices. My first degree was in mathematics education (where I developed a deep appreciation for math). I have interests in...

Homework Statement Here is a small part of an EESEE data set, "Nutrition and Breakfast Cereals," that describes the nutritional content per serving of 77 brands of breakfast cereals: What are the individuals in this data set? For each individual, what variables are given? Which of these...

This is probably a stupid question , but, It's easy enough to show that the mle of a poission distribution is ## \bar{x}##: ## \hat{ \lambda}= \bar{x} ## But,I'm then looking at the generalized ratio test section of my book, multinomial, it esitmates ## \lambda ## for some data by ## \sum...

Thank you in advance. I need to know how to do these 3 problems by tomorrow in order to pass my AP stats class. Please help! 1.Your friend is playing Monopoly and is in desperate straits. He is cashless and has just landed in jail. He must either roll a double to get out free or pay $50...

Hey I am new here and not exactly sure how it works. I am stuck on this problem from my professor and would love any help anyone has!When one thinks of the normal distribution the first thing that comes to mind is the bell curve and grades. While this is one example of a normal curve that is...

Homework Statement Let n and k be positive integers such that both n and n − k are large. Use Stirling’s formula to write as simple an approximation as you can for Pn,k. Homework Equations ## \lim_{n \rightarrow \infty} {(2 \pi)^{1/2}n^{n+1/2}e^{-n} \over n!} = 1 ## The Attempt at a Solution...

Leisure Time In a Gallup poll: 1010 adults were randomly selected and asked if they were satisfied or dissatisfied with the amount of leisure time that they had. Of this sample 657 said that they were satisfied and 353 said that they were dissatisfied. Use a 0.01 significance level to test the...

Hi everyone. It's been years since I've done any stats, so I need a bit of help, please. I want to include it in a blog post I'm going to do (not here on PF), so I don't want to give away too many details :p I apologise for my terrible understanding of stats, please be patient! Anyway, over...

Hey everyone, This may be of interest for those of you looking to pursue Medical Physics in grad school. I spent a little while making a shiny app displaying CAMPEP statistics, including enrollment data and employment post graduation. https://joelcarlson.shinyapps.io/campep/ Something that...

Homework Statement What is reduced density matrix ##\rho_A## and the Bloch vector representation for a state that is 50% ##|0 \rangle## and 50% ##\frac{1}{\sqrt{2}}(|0 \rangle + |1 \rangle)##Homework Equations The Attempt at a Solution [/B] I haven't seen many (any?) examples of this so I'm...

I am trying to use Bayesian methods (Bayes rule) to predict further datapoints (at point n,n+1,n+2 etc..)... I begin by generating a normal pdf using previous 75 datapoints (prior: n-75 to n-1) with mean value, μ: 1.25 and standard deviation, δ: 3.67. Note: previous datapoints range from...

Hello, PF! [My question pertains to a non-rigorous, undergraduate introductory Probability and Statistics course. I'm no math major, so please correct me if I've mishandled any terms or concepts as I try to express myself. I'm always eager to learn!] * * * In a discussion of the...

Hello Everyone, As a long-time University Teaching Assistant in Statistics, I have recently launched a YouTube Channel with the idea of providing help for students who are taking courses in introductory statistics and probability. The videos it contains are the online equivalents of the Review...

Hello, I'm not sure if this is the correct section to post this in, but I need some help with my graphing calculator. I also posted this in the Statistics section. I am given a set of X and Y data (2 sets of numeric data) and I need to find out how to find the Sxx, Syy, and Sxy in my TI84...

I worked out the Planck Black-Body Radiation Formula using Bose-Einstein Statistics, but I feel there is something conceptual I am missing here. When Planck derived the formula, he started out with the Boltzmann distribution function, and assumed that there were discrete energy levels...

Homework Statement I have no idea where the sum of x^2 comes from, from the information I posted. I know it must be something pretty simple but its completely going over my head. In the picture that I've attached, I am wondering where the 2431.72, 4901.66, and 3252.44 come from. Thank you...

Homework Statement An investor wants to purchase one investment among common stocks, preferred stocks and bonds of six industries located in several countries. The investor can use a full-service broker or a discount broker and can buy with cash or margin. If there are 288 possible choices...

This is a two-fold statistical thing I want to pursue and I'm unsure of which test(s) to use. Using data of gender and age at time of death from a large, old cemetery in town I want to compare two things: 1. Average life expectancy of citizens of our town compared to the national average 2...

Homework Statement Given joint pdf: f(x,y) = (2/(x2(x-1)))(y-(2x-1)/(x-1)) x>1, y>1 find marginal pdf fx(x) Homework Equations fx(x) = ∫f(x,y)dy, 0, ∞ The Attempt at a Solution fx(x) = ∫(2/(x2(x-1)))(y-(2x-1)/(x-1)) dy, 1, ∞ = [-2y(x/(1-x))/x3],1,∞ = undefined. stuck here

Homework Statement A word has n letters, in which one of those letters is present a times and another is present b times (all other letters are present only once). a.) How many combinations of x letters are there from this word? b.) How many arrangements of x letters are there from this word...

1. I know var(x)=E(x^2)-E(x)^2; is there a repeated way to use this to attain var(x^2)? Or how in general, without resorting to integration, can I calculate it? 2. We typically deal with "i.i.d random variables X_i" and do things like find var(X) given E(X^2) etc..it never occurred to me...

Sorry I need help in a hurry. This is for work and I haven't done this in a long time. I have a population of ~ 5,338,000 And I know 0.74% respond to something. I want to know if a population of only 5,000 will respond better or worse than my 5 million. I am worried that it is too...

Homework Statement You have 5 identical boxes that stand one after another. How many different ways can you put your 3 identical eggs into these boxes? For whatever reason, my physics professor decided to give us this as a problem to think about in how to solve. However, from my...

Homework Statement Let x be the number of successes in n independent Bernoulli trials, each one having unknown probability θ of success. Assume θ has prior distribution θ ~ Unif(0,1). An extra trial, z, is performed, independent of the first n given θ, but with probability θ/2 of success. Show...

Homework Statement Question 3 here: http://www.stat.washington.edu/peter/395/samplemidterm.pdf Solution to it here: http://www.stat.washington.edu/peter/395/prmt.sln/sln.html By the way, I could use help soon since this is the practice exam for an exam I'm taking 7 hours from now...

Please help me with multiple comparisons - urgent (stats) Hello, I just have a quick question understanding multiple comparisons and I'd appreciate any help because I'm on the verge of failing :rolleyes: I'm reviewing for a test, and reading over questions and their corresponding answers in the...

Hi all, This post will be long, but I hope in giving more relevant information, the replies will be more helpful. Apologies for the length, and thanks for reading, given now. I'll state the question here though to avoid you having to search for it: Does it make any real difference whether...

Homework Statement Let X ~ Exponential(3) and Y ~ Poisson(5). Assume X and Y are independent. Let Z = X + Y. Compute the Cov(X,Z).Homework Equations I know Cov(X, Z) = E(XZ) - E(X)E(Z). But how do I compute E(XZ) and E(Z) ?? Since for E(XZ), I would need the pdf/pmf (Exp is abs cts, while...

1. Homework Statement [/b] A barber shop has two chairs to cut hair and 10 people per hour enter the barbershop to get a haircut. . The average time it takes to get a haircut is 6 minutes. On this particular day, only one barber is cutting hair. Customers that enter the barber shop and use the...

URGENT HELP WITH STATS - Good sampling methods for this would be what? Are the ones I selected right? I only get one submission. Please please help!

Homework Statement So the question is, given a set of random numbers, find the mean and the value that will be >= 99% of the occurances. So for a set of random numbers between say, 1-100, if the mean is 50, how do I find out what number will be >= 99% of all observations of the time...

Homework Statement Suppose that I'm collecting cards, and that in a complete collection there are m items. When buying a new card, there's an equal probability that the card is any of those m cards. Let X be the number of cards I need to buy in order to get a complete collection...

Consider a uniform distribution on the interval 0≤ X ≤ θ. We are interested in estimated θ from a random sample of draws for the PDF. Two potential estimators are: θ1 = (2/n) Ʃ Yi and θ2 = (n/θ)(y/θ)^(n-1) which estimator would you prefer and why? What statistical properties did you...

I'll offer a digest version of my earlier post that appeals to shorter attention spans. I'm considering the pursuit of a graduate degree in statistics. My CV in a nutshell: Math Major: 3.6 GPA (in major) GRE: 159 V / 167 Q Research experience: Summer Institute in Biostatistics (SIBS)...

In May I graduated from a small liberal arts college with a Bachelors in Math (3.6/4) and in Economics (3.8/4). In July I shipped off to Vietnam where I am currently teaching HS Math at a large private school in Hanoi. I took a last minute GRE before I left and scored reasonably well IMO (V 159...

I was wondering what a introductory (1 year sequence) mathematical statistics would be like in terms of mathematical rigor and usages of calculus 1 - 3. The course I'm thinking about taking requires calc 3. I've heard that graduate level mathematical stats courses can be just as rigerous as a...

Hi all, I was wondering if someone can tell me that is probability branch of mathematics or statistics. Wikipedia says that Probability Theory is branch of mathematics but in University Statistics department offers probability modules. Also, is Statistics branch of mathematics, after all it...

Homework Statement http://i.imgur.com/tjpka.png (the actual problem is the third part down) Homework Equations the first two parts are the definition of borel sets,and the second part is a relevant theorem. The Attempt at a Solution so I'm new to Borel sets. And I feel like I'm...