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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: 196,713
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: 66,732
09-30-2005, 09:44 AM
1. ### Sampling distributions related to normal distribution

iid=independent and identically distributed This is the model answer to a question which is unlikely to be wrong. I don't understand the part...

• Replies: 7
• Views: 3,578
01-16-2009, 04:53 AM
2. ### Mixed Repeated Measures ANOVA - some questions

I have run an experiment and am analysing the results using a mixed RM ANOVA in SPSS. I have two queries, which I hope you can help me with. I...

• Replies: 7
• Views: 24,538
05-19-2009, 08:55 PM
3. ### Comparing 2 regression models

Hello, I've estimated two regression models: 1. y=ax 2. y= ax + b I guess the question I'm trying to address is whether adding a constant...

• Replies: 7
• Views: 4,688
01-19-2009, 04:24 PM
4. ### Beta distribution

Hi, Could you please advise how to estimate the 95% confidence interval for the mean if the data which follows a beta distribution? Thank you...

• Replies: 7
• Views: 12,642
01-26-2009, 03:32 PM
5. ### Help please! Homogeneity of variance violated

Hi all, I'm in need of help - I'm trying to run a one-way ANOVA with 4 groups and I've just realised that the homogeneity of variance is violated. ...

• Replies: 7
• Views: 13,932
01-26-2009, 06:38 AM
6. ### My null-hypothesis

Hi, I'm trying to test a hypothesis of a relationship y = b0 + b1x + b2z NOT including z. In other words, I'm trying to show that z = 0. What...

• Replies: 7
• Views: 3,298
01-26-2009, 10:04 PM
7. ### Statistical Significance

Hi I'm kinda new at statistics. I was wondering if it would be correct to say that the response rate that you get back from a survey is...

• Replies: 7
• Views: 4,497
01-30-2009, 04:35 PM
8. ### What Constitutes "better"?

I have this problem for homework: I'm not sure what it's asking. Does it want me to find the largest area and base the best life span on that...

• Replies: 7
• Views: 3,916
02-02-2009, 11:32 PM
9. ### Probability help...

Hey, I'm new here and somewhat new to statistics. I have been doing a bit of homework lately, and have been stuck on a relatively simple problem and...

• Replies: 7
• Views: 5,039
dhl
02-11-2009, 02:39 AM
10. ### Help with finding appropriate statistical method

Hello, I'm doing research on diet effects. There were 3 measurements (1,2,3) of two groups (diet group which used diet tehniques, and control...

• Replies: 7
• Views: 3,335
03-10-2009, 11:15 AM
11. ### Not sure what to 'do' with my data

Hi all, this is my first post here and I have a real pushing-my-luck question! Basically I have no idea what I want to ‘find’ in my data. I am...

• Replies: 7
• Views: 2,518
03-14-2009, 08:59 AM
12. ### Looking Up / Interpreting p Value for z values

Hi all, Another question. May be a silly question but my brain often gets tangled when going from book to application. After hours of...

• Replies: 7
• Views: 7,369
04-14-2009, 05:47 AM
13. ### What stats test do I need to find a correlation/association/relationship?

Hello, I have a question I am hoping someone can help me with. I am trying to see if there is association with a particular disease and an...

• Replies: 7
• Views: 3,752
04-18-2009, 01:37 AM
14. ### binary logistic regression: distribution of the dependent variable

Hi, I would like to know if the number of observation in each category of the dependant variable can produce wrong results when you do a binary...

• Replies: 7
• Views: 6,105
05-02-2009, 11:31 AM
15. ### Significantly the same?

How do you test if two groups are significantly the same? When you do a significance test of two groups and p<.05, we can be confident that they...

• Replies: 7
• Views: 7,218
05-28-2009, 08:26 PM
16. ### Survey Size

I have taken statistics before in college and grad school (MBA), but I am so foggy. I have a simple 10 question survey I am administering in Survey...

• Replies: 7
• Views: 6,013
06-16-2009, 09:27 PM
17. ### What to do when interaction occurrs

Hi all, I have a question about interaction when running an ANOVA. Here is a summary of my test: measuring machine accuracy under 2 treatments...

• Replies: 7
• Views: 3,680
07-02-2009, 02:53 PM
18. ### Help me please ... How to calculate the next element

Hello, My boss has just asked me to come up with a formula which allows me to calculate the dow jones odds. I have all the dow jones values since...

• Replies: 7
• Views: 4,168
08-11-2009, 08:29 AM
19. ### Help! Correlation between Categorical Data & Interval data

Hi, I am looking for some basic stats help and would appreciate any and all feedback! Thank you in advance! 1. I am trying to correlate...

• Replies: 7
• Views: 22,529
08-11-2009, 02:36 PM
20. ### two way ancova problem

I have to analyze a set of data, and while I know roughly what I'm doing, I am having some problems making conclusions. I will outline the data and...

• Replies: 7
• Views: 8,427
09-28-2009, 02:39 PM
21. ### Standard Error Question!

Hi all, I have a sample of 200 cars (45 bmw, 35 saab, 55 audi & 65 toyota). I am supposed to find the standard error. Standard Error =...

• Replies: 7
• Views: 3,185
10-08-2009, 06:17 AM
22. ### When SD is calculated from SE

I have a question about what the standard deviation means when it's calculated from the standard error. Here's the scenario: I'm looking at a...

• Replies: 7
• Views: 5,487
10-07-2009, 07:48 PM
23. ### F-test

The problem is about comparing two investments and see if A has a higher standard deviation than B in return. σ_a= 1,73864 and σ_b=1,28369 F...

• Replies: 7
• Views: 2,459
10-31-2009, 07:59 AM
24. ### Correlation (data need to be normall distributed?)

Hi, today, I read through the chapter 'correlation' and there it is stated: the condition to apply either regression or correlation is that...

• Replies: 7
• Views: 21,197
11-22-2009, 07:12 PM
25. ### Explain standard deviation formula

Hi all, We take the square root of variance to get the standard deviation, right? And the reason is that variance units are in square terms....

• Replies: 7
• Views: 9,186
09-12-2010, 12:44 PM
26. ### Interpreting chi square results

Would appreciate help interpreting this contingency table and chi square results (not real data, just for illustration purposes). Trying to see if...

• Replies: 7
• Views: 11,261
12-19-2009, 10:33 AM
27. ### confused..Kruskal-Wallis!,mutipe Mann-Whitney!,ANOVA!

Hi everyone I’m doing a research on three different diseases I’m measuring a protein in theses diseases using an ordinal score The scores are...

• Replies: 7
• Views: 9,776
12-06-2009, 09:21 AM
28. ### j curve ?

Hi, Hoping somebody can help. I am looking at some exam results. They reach a ceiling and the resulting histogram is ski jump shaped ? Can I treat...

• Replies: 7
• Views: 3,297
01-03-2010, 11:47 AM
29. ### What are the popular journals in statistics?

Hi all, I am wondering whether anyone can give me a list of those popular journals in the statistics. Or a search engine is even more helpful. ...

• Replies: 7
• Views: 4,578
01-05-2010, 03:23 AM
30. ### Which paper proposed chi square distribution?

Hi all, I am wondering who is the first one to discover the chi square distribution and what paper he/she published? Thx in advance. yg

• Replies: 7
• Views: 5,418
01-05-2010, 05:15 PM
31. ### Warning message in Regression analysis

Hi there, I am working on my stats for my masters degree and am running a regression and receive the following message: "For models with your...

• Replies: 7
• Views: 16,252
01-10-2010, 11:26 AM
32. ### Shapiro-Wilk test for large samples

Hi all, does anyone know a routine with which to calculate the Shapiro-Wilk test statistic and corresponding p-values for sample sizes of >10000?...

• Replies: 7
• Views: 15,043
03-25-2010, 04:21 PM
33. ### TI calculator

Am trying to buy a new calculator for stats, I have a TI 82 but it seems rather limited as we advance in the book. Any recommendations for a more...

• Replies: 7
• Views: 3,293
05-08-2010, 01:04 PM
34. ### Need some help with comparison

Hello, The first question is: I've got a sample (39 samples) of IQ from men and women, now we have to decide whether there is a significant...

• Replies: 7
• Views: 3,462
06-22-2010, 01:58 PM
35. ### Very simple question

What is the best way to determine something as simple as finding out whether the following test grades are improving (in a sequence): 46, 52,...

• Replies: 7
• Views: 2,803
06-30-2010, 09:56 AM
36. ### p and F value confusion!!!

Hi, I am hoping someone can explain why when i run an ANOVA at 95% the F>f(crit) and p<0.05, but when i ran it again at 99% the F<f(crit) but...

• Replies: 7
• Views: 6,412
07-11-2010, 07:48 PM
37. ### Comparing percentages

Hi, this is my first post on here so I hope it's in the right place! I have been doing some research using a large hospital database. I want to...

• Replies: 7
• Views: 12,496
07-19-2010, 07:48 PM
38. ### Fair Coin... Chi square or binomial?

Hello all, this is my first post, so please be gentle with me. When testing whether a coin is fair or not, is it correct to use the binomial...

• Replies: 7
• Views: 18,501
08-29-2010, 01:24 PM
39. ### i need you opinion

i would like to ask: if i have a some independent variables and i want to do the bivariant analysis to test their association an outcome...

• Replies: 7
• Views: 2,979
09-18-2010, 05:28 AM
40. ### Binomial Distribution

Hello All, I have a basic question regarding binomial distribution. A survey is taken from 1,000 people. 625 answered yes and 375 answered no....

• Replies: 7
• Views: 3,159
09-16-2010, 02:24 PM
41. ### Residual error estimate

Consider a regression model: E(Y|x) = \alpha + \beta x + \epsilon where \epsilon ~ N(0, {\sigma}^2) . Find a point estimate of ...

• Replies: 7
• Views: 7,286
09-17-2010, 10:25 PM
42. ### 68-95-99.7 rule

I have finally figured out the standard deviation and think I am getting the hang of distribution on a bell-shaped curve. What I don't understand...

• Replies: 7
• Views: 5,795
09-27-2010, 12:39 PM
43. ### Binomial or Poisson dist.?

Testing for a disease. has 0.02 probability of giving a false-positive reading and probability of 0.03 of giving a false-negative result. (a...

• Replies: 7
• Views: 4,501
10-24-2010, 05:20 PM
44. ### Test Hypothesis

If a test hypothesis has a Type 1 error probability of .05 this means? a if the null hypothesis is true we dont reject if 5% of the time b if the...

• Replies: 7
• Views: 4,919
11-04-2010, 12:47 AM
45. ### mid-class values

The following table gives the ages in completed years of 141 persons in a town involved in road accidents during a particular year. Ages (years):...

• Replies: 7
• Views: 9,370
11-12-2010, 08:18 AM
46. ### Skewness of a sum of independent lognormal variables?

Hey, I have a set of lognormally distributed independent variables X1,...,Xn each with different E and Var for k=1,2...n. (So each Xk has its own...

• Replies: 7
• Views: 9,785
11-12-2010, 07:10 PM
47. ### ANOVA testing!

Your professor is interested in how to effectively teach statistics to undergraduates so he randomly selects 21 students from the undergraduate...

• Replies: 7
• Views: 4,562
11-15-2010, 09:25 PM
48. ### Likert Scale Analysis - How to?

Greetings, I am new to Talk Stat and could use some help. Background: I did a survey on the effects of ISO 9000 on business performance using a...

• Replies: 7
• Views: 7,847
11-30-2010, 12:47 AM
49. ### Testing for differences between correlations

I'm looking to correlate three measurements of participants with a fourth variable, yielding three non-independent correlation coefficients. I would ...

• Replies: 7
• Views: 3,581
12-03-2010, 12:24 AM
50. ### T test

Hi, So I have been working hard on a project. However, I am a little stuck. For the question, " How well did students’ estimates of ‘how many...

• Replies: 7
• Views: 3,497
12-03-2010, 02:46 AM
51. ### Random variables problem

Hello all. I'm having a lot of trouble with several of the problems on my latest stat homework. Up until now I've understood almost everything, but...

• Replies: 7
• Views: 4,187
BGM
12-07-2010, 10:27 AM
52. ### two mean sample hypothesis testing

Hi i need help with this question. In a study by Mino et. al. (2006), 50 workers in high-stress jobs were randomly split between a stress-management...

• Replies: 7
• Views: 2,993
12-08-2010, 12:52 AM
53. ### outliers

Hi, I know Median and Mode aren't effected by outliers but which of these is least affected by extreme values? Thanks

• Replies: 7
• Views: 4,072
12-10-2010, 12:02 PM
54. ### lognormal

How do I find the p50 value in a lognormal distribution given p10 and p90 using excel/@RISK ??

• Replies: 7
• Views: 10,767
BGM
01-15-2011, 05:59 AM
55. ### Normal and Standard normal distributed variable

What is the benefit of switching from a normal distributed variable to standard normally distributed variable ?

• Replies: 7
• Views: 7,498
01-20-2011, 04:56 AM

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