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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### Sticky: Forum Guidelines: Smart posting behavior pays off

Welcome to talkstats.com, the place for statistics help. This is a guideline for people who want to ask a question on this forum and value a...

• Replies: 1
• Views: 197,184
07-16-2014, 11:01 AM
2. ### Sticky: We only provide homework help to those who show effort

Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

• Replies: 0
• Views: 66,970
09-30-2005, 09:44 AM
1. ### Normal Distribution Question

Need Help!!! Here is the problem: The National Center for Educational Statistics report that in the year ending 2003 some 400,000 students took...

• Replies: 14
• Views: 4,042
06-19-2007, 08:38 PM
2. ### Probability (i think quite hard) question...any hints?

Have you any ideas on how to solve this problem? I don't know how to start! At least some hints to begin with...thanx 2 students can solve...

• Replies: 14
• Views: 3,866
10-25-2008, 10:46 AM
3. ### Tricky question...can you solve it?

I have a sample about the number of essays of politics received on time in each of the first 8 weeks. Sample mean=8. Sample variance=2. Then I have...

• Replies: 14
• Views: 3,389
11-03-2008, 12:20 PM
4. ### normal distribution?

Hi, Could someone please shed his/her light on my 'problem'? When I looked at the frequency histogram of my data, it looked pretty normal to me...

• Replies: 14
• Views: 3,456
01-20-2009, 01:41 AM
5. ### Comparing sample with normative data

Problem: I will have survey results for a largish sample (n>300) and want to compare how different their scores are to established norms. The norms...

• Replies: 14
• Views: 16,059
07-17-2009, 04:10 AM
6. ### Correlation with a nominal variable?

Hello, I'm conducting a research project where I'm trying to find the correlation between the LSI-R total score (survey) and recidivism (if the...

• Replies: 14
• Views: 32,337
01-21-2015, 08:43 AM
7. ### ANCOVA violating homoscedasticity

I've come across a problem in ANCOVA that I can't seem to figure out. I have a sample size of over 600 people. I've got a 2 (male vs female) x 3...

• Replies: 14
• Views: 11,372
02-20-2011, 11:56 AM
8. ### importing csv files into R

Hi I keep trying to import a csv file into R but keep getting the error "ÿþS", please can anyone tell me what I am doing wrong

• Replies: 14
• Views: 12,442
06-02-2013, 05:16 PM
9. ### High and Low level of achievement

Hi In an achievement test, i want to divide the samples into a group of high and low achievers. My subordinate suggested the formula of M-1S for...

• Replies: 14
• Views: 3,263
01-03-2011, 05:08 PM
10. ### correlation between binomial and continue variables

Hi all, I d like know if exist some method for run a correlation between 2 variables: one continue (and normal variate) and other binomial...

• Replies: 14
• Views: 2,357
09-30-2011, 12:30 PM
11. ### Should degrees of freedom be explained?

I've always been dissatisfied with the "explanations" of degrees of freedom presented in statistics courses. These explanations either rely on...

• Replies: 14
• Views: 5,521
10-03-2011, 11:56 PM
12. ### Calculating alpha and power

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:...

• Replies: 14
• Views: 16,291
10-09-2011, 03:47 PM
13. ### Simple(I think) Chi Square question and my proposed solution.

Not very confident with stats so just wanted some reassurance that I’m doing the Right Thing with the question I’ve been set here. A survey of 60...

• Replies: 14
• Views: 3,590
12-11-2011, 04:33 PM
14. ### STATISTICAL INFERENCE ; Effect SIZE & Power Question

Hello everyone!:wave: I'm having trouble solving the below stats question. If anyone can show me tips, I would really appreciate it. You are...

• Replies: 14
• Views: 5,400
12-20-2011, 02:54 AM
15. ### XTLOGIT - interpreting odds ratio. Am I on the right track??????

I ran an xtlogit model on my panel data. Dependent variable: whether ppl adhere to the program or not (0 do not adhere 1 adhere) Independent...

• Replies: 14
• Views: 16,222
01-08-2012, 06:20 PM
16. ### Exam Question (flawed?)

Hi, I'm new here... I work in a school in Ireland, where a new Maths course (called Project Maths) has just been introduced for the Leaving Cert...

• Replies: 14
• Views: 3,002
01-11-2012, 10:47 AM
17. ### Coorelation

Hi all, I am new to statistics..and this could be a simple question. I have a data that has around 5000 rows...each row is a variable, and I have...

• Replies: 14
• Views: 2,050
01-20-2012, 10:24 PM
18. ### Effect size

I have difficulty to calculate the effect size and how to interpret the results. I wonder if you could help me, I am really stuck on this point :((...

• Replies: 14
• Views: 4,091
03-04-2012, 10:14 AM
19. ### Project - t-test vs. anova

Hi guys, I'm doing a project looking at elaborative communication in teachers. I have 2 IV's - 'Talk' conditions: IV1 = elaborative techniques...

• Replies: 14
• Views: 2,591
03-18-2012, 11:36 PM
20. ### Data transformation

Hello I am asking about data transformation attempting to normalize it. How can I decide which transformation to use? I read that the curve...

• Replies: 14
• Views: 2,813
04-18-2012, 11:25 AM
21. ### [SOLVED] SE on count data?

I recently created a bar graph in ggplot2 and noticed in the help file Hadley Wickham has what appears to be a count data set with standard errors...

• Replies: 14
• Views: 7,236
05-19-2012, 08:02 PM
22. ### why is this a right tail? [Hypothesis Testing]

THE QUESTION: what makes this decide that this is a right tail, is there a keyword ?

• Replies: 14
• Views: 6,219
05-30-2012, 08:31 PM
23. ### How do I Construct a 95% confidence interval (C.I.) with this formula?

Hi, Im hoping someone can help do this for me. Construct a 95% confidence interval (Using the following formula: 95% C.I. Equals "mean +/-...

• Replies: 14
• Views: 2,984
07-20-2014, 04:42 AM
24. ### Fisher's Exact Test for determining correlation between variables

Hello all, My P.I. has presented me with a 2x2 contingency table and asked me to perform Fisher's Exact Test to determine whether a correlation...

• Replies: 14
• Views: 14,697
09-24-2012, 11:52 AM
25. ### Independent Binomial random variables, MLE of px and py

Let X and Y be independent Binomial random where X~B(Nx, px) and Y~B(Ny,py), where Nx and Ny are known and px and py are unknown. (a) Suppose...

• Replies: 14
• Views: 2,472
BGM
12-10-2012, 10:28 PM
26. ### suggest suitable Statistical test

Very simple problem... There is a store where 100 people visit, 52 are males and 48 are females, so the proportion is 0.52 and 0.48 respectively Is...

• Replies: 14
• Views: 2,225
01-31-2013, 08:08 AM

my dissertation is in tomorrow and i really need to know which statistical test to run on my study. I will internet bank £15 to anyone who can...

• Replies: 14
• Views: 1,786
04-30-2013, 02:14 PM
28. ### Calculating my percentile score - it just seems too high!

I recently completed an exam and received my scores. I wanted to find out my percentile. I got a total of 317.5 out of a total score of 500. I...

• Replies: 14
• Views: 1,994
05-29-2013, 01:39 PM
29. ### Very General - Simple Statistics Question

This is a general question i have. **** FULL QUESTION **** Problem: Lexico specializes in the manufacture of coated cables. (Do a Google search...

• Replies: 14
• Views: 4,059
10-04-2013, 01:55 PM
30. ### Maximum Likelihood Estimator(MLE) for P

Q: Suppose we have a coin for which the probability that it lands on heads is p where p equals either 0.4 or 0.7, but we do not know which of these...

• Replies: 14
• Views: 1,980
03-09-2014, 12:57 PM

how do i interpret a 95% confidence interval which is presented in percentages with no standard deviations. (this is for a medical essay) two...

• Replies: 14
• Views: 2,016
03-21-2014, 03:18 AM
32. ### How to average coefficients' standard errors?

Hi, I'm considering a "mean-group"-estimator, where the estimated coefficients are unweighted means of multiple regressions from different groups....

• Replies: 14
• Views: 2,859
04-07-2014, 02:56 PM
33. ### MLE for X ~ Exp(λ)

Let (X1, ... Xn) be a random sample from a random variable. Find the maximum likelihood estimator for λ. I know the answer to this but do you...

• Replies: 14
• Views: 13,167
07-22-2014, 07:13 AM

Hi, I'm really hoping that someone on here can help me. I'm sure this is going to be something ridiculously simple for someone but I am struggling...

• Replies: 14
• Views: 2,177
10-28-2014, 08:00 AM
35. ### Continuous or categorical variable

Hi guys, I'm currently enrolled in a medical statistics course and I'd like some help with a problem I'm facing. I have a dataset that contains...

• Replies: 14
• Views: 2,218
01-23-2015, 06:02 PM
36. ### PCA or clustering on binary data?

Hello, I have a dataset consisting of around 30 species of plants (rows) and around 50 variables (my columns) that are medicinal properties of...

• Replies: 14
• Views: 3,192
10-15-2015, 10:55 AM
37. ### Factor analysis

Is anyone an expert on factor analysis?

• Replies: 13
• Views: 4,403
02-10-2006, 09:17 AM
38. ### ANOVA, assumptions mandatory?

So on numerous websites, which of course we can trust completely ;) I've run across arguments that the normality and homogeneity assumptions for...

• Replies: 13
• Views: 10,395
09-12-2008, 07:44 AM
39. ### significant interaction but non significant simple effects?

Hello everyone, I conducted a 2x2 mixed design ANOVA. The between subjects factor was group (high vs. low), and the within subjects factor was...

• Replies: 13
• Views: 36,428
05-03-2010, 08:27 AM
40. ### Independent or Depedent T Test?

I am struggling with this question and I was wondering if anyone can offer any insight? Lets say a fisheries biologist wants to know if a new...

• Replies: 13
• Views: 4,390
10-18-2008, 11:52 PM
41. ### Help with HLM

Can anybody help me by telling whether the following data IS suitable form HLM? Variable 1: Three regions (of the world) Variable 2: Several...

• Replies: 13
• Views: 4,433
11-15-2008, 10:12 AM
42. ### Rao-Blackwell Theorem

I was reading this theorem again and again, but I really don't understand the meaning of "for all theta" in this theorem (circled in red). I thought...

• Replies: 13
• Views: 4,864
02-01-2009, 02:27 PM
43. ### What test should I consider?

Hello everyone. Very interesting forum although a bit deep for a stats-noob like myself. I have a question, any help you can give would be...

• Replies: 13
• Views: 4,355
12-16-2009, 03:59 PM

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