Forum: Statistics

Hi, this is my experiment: n users will use 4 different user interfaces (A-D) for exploring the content of a web site. I will systematically...

Two coins are tossed 80 times and the number of heads counted each time gave: \begin{tabular}{llll} Number of Heads&0&1&2\\ Frequency&10&50&20...

I am wondering if I did this correct. If I didn't, I want to see what I did wrong. Here is the question. According to flightstats.com American...

Hi all, Firstly thank you for taking the time to look at this post! I have been asked to run an ANOVA on data collected over a 3 year period. ...

What is the best way to find the sample's Standard Deviation if I only have the Estimated Price and 95% (Upper and Lower) Confidence Intervals.. They...

I want to see if I'm identifying these properties correctly, or am I wrong: n=4 X=.2 p=.0016 q=.9984 Here's the problem: ...

The issue is something like: 6 surgeons, A through F, carried out a surgery and infused milliliters of Y fluid. Whether the milliliters of fluid...

Okay, I've been struggling with this problem for over two hours and I'm continuing to get more confused. Any advice would be great. Here's the...

I want to make sure I'm doing this correctly with the information given... The problem reads: You work for the health dept. and it reports a...

Hi, I have a variable called VWORKER, it stands for the the number of volunteer workers at a local office, which should never exceed 10, I am...

How do you determine the sample size and power for complicated designs such as split plots or other experimental designs that are not as simple as...

Hi, I have a mean wealth of £102,000. I want to find the proportion of people below £17,500. i don't know the standard deviation, but I know the...

Research is being done into the awareness and prevalence of HIV/AIDS across Africa. According to DevelopAfrica.org approximately 67% of those living...

Hello, I have an average temperature value for a day in January (-14) and I want to see if it is different then the average value for the entire...

so I conducted a survey on sleep habits and I need help on whether or not I reject or fail to reject my original hypothesis. I have to use a...

Hi, I am having trouble understanding goodness of fit tests. I am given the following data and want to determine if the suicide rate is...

Hi there, just discovered this thriving forum! Basically, I have a time-series data set of various prices, income, and quantity from which I want...

Hello, suppose we have a table like this: and we want to know if wining or loosing depends on sex (male or female) apart from chi-square test...

Hi all: First post here, hopefully in the right forum. I'm trying to teach myself basic stats (using the book Statistics in a Nutshell) and I'm...

how to find out the relationship between two variables without using regression method??:confused:

Could anyone refer me to the right direction on how to solve a problem regarding playing cards? It is a 3 Card Poker game, using 12 cards that are...

Ok, i am trying to work the cultural distance between Peru and Denmark for my Thesis. The formula is:LINK TO FORMULA Instead of United States...

Hi, I have a set of data which is consisted of ages of 5 players and their scores in game. The question is this: Does the older players tend to...

Hello, Given students grades in test 1 and 2 Test1 - Test2 100 - 80 99 - 79 98 - 78 97 - 77 96 - 75 95 - 73

Hi everyone. I am trying to find the distribution of ln(X) when i know that X is distributed as a binodal normal distribution, in other words: ...

smoothing compararison

The Mean is 1262 and STD is 118 Determine the number of choclate chips in a bag of Chips Ahoy! That make up the middle 99%. Okay, I got one of...

Hi all, I'm stuck on a problem I've been given: "The sample mean of X is 16, the sample size is 100, and the population mean and variance are...

Pls i need some assistance on how to calculate my p-value without the use of software, am using a two-way anova and i got my f ratio alright but...

Hi, I have a problem solving a task, I was hoping that someone could help me. A machine fills bags with content. From the production a sample...

Good day everyone. I'm a student who are currently doing her psychology research (final year project). I'm having an issue with my data being not...

Hi, I’d like comments concerning our statistical plan in a science fair project. The project tests device X against a control device. Using either...

Hi, Is there any way to find outlier without having the distribution of data? Thanks and Regards

Hi folks, :wave: I think I did my research but I would like to be sure before continuing. My task is to find the mean price of a given item in...

Hi, Is the following integral equels to F(z)(distribution function for standard normal distribution at point z) but we dnt know which distribution...

If im looking at current method vs new method for 8 specimens - 1)Semis vs Semis 2) Ultras vs Ultras and instead i look at statistics to score...

Suppose you have the model: X_{t} = 0.2*X_{t-1} + 0.3X_{t-2} + w_{t} + w_{t-1} + w_{t-2} where w_{t} is WN(0,\sigma^{2}). How would you express...

Suppose you have the model: X_{t} = 0.2*X_{t-1} + 0.3_X_{t-2} + w_{t} + w_{t-1} + w_{t-2}

I want to analyze the correlation and the significanse between blood test cound (continous variable) and another continous variable- which test shoul...

Hi I'd be really appreciative if anyone might be able to help me. I'm studying biology at a foundation level and have recently been introduced to...

I have a data set with 2 state spaces (for which I've already generated a transition matrix). The form of the transition matrix is the following...

I'm helping someone out with kind of a cruddy dataset, I was hoping I could ask a question about how weights work in SPSS and if I'm thinking...

Hello , I have data that could be match between 40% up to 90% , should I use chi-square or McNemar test ? Thanks

Question : Exam 1 Scores, 92, 87, 91, 86, 97, 97, 94, 71, 61, 77, Exam 2 scores, 70,83,93,87,97,97,93,87,73,87.. N=10 Create a Simple...

what is two factorial nonparametric analysis? is there any difference between it and cmh chi-square? can i use sas software to do it?

My independent variable is assessment of whether respondents fear that crime is the worst problem in their city, and this assessment has 3 catagories...

Hi there, I have recently come across some data that compares the accuracy of two diagnostic tests. We have 214 samples which are tested positive...

How do you go about finding the expected value of the sum(abs(X_i)), i=1,...,n? The X_i are iid Normal with mean 0 and variance theta.

Hi, I Know with the data a c t 1 1 1 1 2 1 1 0 3 2 3 2 4 1 1 0

Hey everyone, A bit stuck, attempting to do a statistical analysis for this research paper for my undergrad. I am basically looking at 3...

Hello, I need help with the develpment of this exercise that I'm trying to solve. Let \widehat{\sigma} be the U.M.V.Uestimate of \sigma when \mu...

Hello all, I am running a Mixed Models Linear Regression analysis in SPSS and I'm having trouble determining if I need to include both /RANDOM and...