Forum: Statistics

good evening everyone, I have made my way through my assignment and have one outstanding question that for some reason is giving me trouble. I...

Hi I have two lists (for example), as follows: 1: Horses 2: Houses 3: Cars 4: Cats 5: Bananas 6: Shovels

I have a device that runs a particular blood test on the sample provided to it. There are 32 samples, and each is run through the device twice. Given...

I am trying to do a t-test for two samples. The question asks me compare the mean salary of sample1 and sample2. I know how to do a t-test in excel...

I need 100 people to answer this so I can do a school project. How many hours a week (7 days) do you play a musical instrument? 0, 1-2, 3-4, 5+....

1. The problem statement, all variables and given/known data Given that the natural log of the growth consumption rate is conditionally normally...

Hi, I have a survey of ability with six questions scored one to five: total min score is five and total max score is thirty. My sample completed...

I want to determine if two binary variables come from the same distribution. For example, let's say I have two lopsided coins. After 100 flips:...

In a survey, the same sample of people were asked two different yes/no-questions. The proportion answering yes to the first question was 0.6 with...

I want to see if there is a trend in data below or any statistical analysis to do it in stata? Year Percentage of students did not pass the...

Hi all, I'm a first year experimental psychology PhD student with a focus in cognitive neuroscience. So far grad school's been great but I'm...

Hi all, first time poster and see there is a lot of help offered on this site. I’m having a little trouble choosing the right statistical test for...

Hello Folks, I'm new to this forum and completely new to Statistics. I desperately need some help to get into this science. So here's my question:...

Hi, Let say I have data in a shape: - so mainly zeros.... However I know how long is my 'signal' and how many counts are they. Is it...

Hi I want to generate a sports league table using two different methods. I think I will end up with the teams in different positions and I want to...

Hello math experts! Can some one please help me with the following scenario. For a set of 'n' readings, the standard dev for whole set is...

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Hi everyone, I'm new to the site and hoping someone would be able to point me in the right direction with a problem I have. Q// Find the...

Students (95 females, 80 males) in a first-year statistics class at a university were surveyed on their consumption of alcohol. The survey was...

Dear all, I am studying the 3 approaches (A, B and C) 47 Spanish public universities from the 17 Spanish states (somes states have more than one...

Can anybody tell me why is it important to verify the self reported disease history in the study and how this limitation is serious and how one could...

I don't know how to tell if a value passes the critical region or not. What does it mean if something is significant at the .01 level? How do I tell?...

(c) To answer the question `do Japanese cars have a better fuel consumption than American cars?' perform a hypothesis test by completing the...

I am reading books on categorical data analysis. are the assumption of indepently and identically distributed (errors terms) and independence of...

d) Perform a hypothesis test to see if the true mean time to accelerate from 0 to 100km/hr for eight-cylinder cars is less 14 seconds. In performing...

Hi all I'm totally new to this and really need some help with understanding how I can glean useful information from census data. Its only a basic...

Hello stats experts. I have this question below that i need a little help with. I am not exactly sure where to start one this question, but i am...

Hi - struggling to understand what the difference is between an odds ratio and a risk ratio? :confused: Can anyone help? Thanks!

I have been asked a homework question that I am not sure how to answer, namely "How many points would you expect to be outside the three standard...

My research topic is based on comparison of the Effects of Traditional and Modern teaching techniques on Students’ Attitude and Achievement in...

Assumption: Tertiary wing feathers are warmer Hypotheses: 1) During cold weather feather mites will accumulate on the tertiary wing feather 2)...

Hi, I have this question on a sample test, but I missed the day they taught this. I have no idea how to read this question, and what means what....

In Multiple Regression the inferences drawn are a)Similar to that fonr for the straight line model b) Dissimilar c) The significance of each...

When Assumptions of the model are violated then to do modelling one has to first do a) Durbin Watson Test b) look for Multicollinearity c)...

In regression we get the normal equations by (a) differentiating the model w.r.t the error (b) partial differentiation of the model w.r.t the...

I don't know how to start but I do know the formula I need to use. The problem is: Carl knows that there is a relationship between a person's age...

Hoping somebody can help with this? Recently we conducted a small study with ten participants. Each participant completed the same two tests,...

Can anyone recommend a resource (book or online) that will clearly explain how to calculate Tukeys by hand, based on my SPSS output from a repeated...

A box contains 20 balls, some red and some black. We want to test the hypotheses: Null: there are exactly 4 red balls in the box. Alternative:...

Can anyone please help?! Thanks a lot! Assuming that the quality characteristic that is being monitored is normally distributed, calculate the...

In a factory, it is known that 0,82% of the items produced are malfunctioned. In a month 150.000 items are produced in this factory. Top management...

I am only used to running stats which compare groups on a dependent variable (e.g. effect of drug vs. no-drug on behavior). However, for this data...

In my master study, I have computed a number of species diversity indices and want to compare these between localities and between stations within...

Im doing a survey and I want to conduct my pilot study, im not so sure of how to calculate the sample size will you please help me ...

Hi all For a paired samples t test, is the only assumption that, for the underlying population, the differences have an approximately normal...

X is a random variable with moments, E, E, E, and so forth. Prove the following is true for i) X is discrete, ii) X is continuous E^4 = E(X^4) -...

Hi there, I am completely stumped on which tests to use for a study that I am working on. Basically, I have two groups, 1 & 2. The two groups are...

Hi there, hope someone can help me out with this question Suppose that PSA (Prostate specific antigen) has a normal distribution in healthy...

Hi, I am having trouble understanding how to approach a simulation: I have a sample of n=250 from a population of N=2,000 individuals, and I would...

- edit - Thanks anyway!

First, I just a greybeard programmer tasked to make sense of an old table the boss has. Second, I can't believe that nobody else took the username...

I am looking to solve for these. I believe I know E(X) and E(Y)... but I do not know how to solve for the rest. Can anyone show me how to do this in...

Hi, I don't know much about time series, but so hoping someone here does that can help. I'm trying to build a model in SAS that forecasts the home...

In the past, I used Microsoft equation but it was really time consuming. Anyone who is using other programs that make it easy to write those...

I have been after a book which gives a brief and understandable introduction of binary logit model, multinomial logit model, mixed logit model and...

Hi all, I have had my research paper accepted to be published which is great but the reviewer has asked me to carry out some corrections. To...