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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: 197,299
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: 67,050
09-30-2005, 09:44 AM
1. ### Games-Howell tests in R

Hiya, I have a set of data with one IV (3 levels) and 1 DV which fail a Bartlett's test for homogeneity of variance and the data cannot be...

• Replies: 1
• Views: 7,982
06-19-2012, 11:03 AM
2. ### stastistical test on normalized data

I have to perform a stastistical test to asses if two grug show the same or different effect on my prepartion. I tested on the same preparation only...

• Replies: 3
• Views: 7,981
09-12-2007, 09:28 PM
3. ### Confidence Intervals, Test of Significance, Matched Pairs Test of Significance

Well, I have a test tomorrow on this stuff and I don't know where to start. here's some example questions: An SRS of 100 postal employees...

• Replies: 2
• Views: 7,973
04-29-2009, 09:57 PM
4. ### Paired T-test on time series

Hi, Data are time serie force signals of 150 samples each (1,5 seconds at 100 Hz acquisition). There are 10 subjects with two conditions. ...

• Replies: 1
• Views: 7,966
10-31-2008, 12:37 PM
5. ### McNemar's test?????

So I gathered paired categorical data and I need to know how to analyze it. My teacher told me to use a McNemar's test but we have never done that...

• Replies: 2
• Views: 7,964
03-15-2011, 06:47 PM
6. ### Using normal to approximate binomial

"After changing to newer healthier food oils, the company claims that 97 out of 100 people cannot detect a difference in taste between the new and...

• Replies: 1
• Views: 7,963
11-19-2008, 09:23 AM
7. ### Different significance values from Pearson and Spearman tests

Hi I am asking for help because I am confused with the interpretaion of the results. The data is obviously non-linear as Pearson coeficient is...

• Replies: 8
• Views: 7,953
10-19-2011, 09:05 PM
8. ### level of measurement

Hi John, just to confirm if the following is the ratio measurement. I belive its ratio because the zero is the actual possibility, when there is no...

• Replies: 4
• Views: 7,950
02-23-2006, 01:53 PM
9. ### symmetry of distribution

Hi, How can I test symmetry of a generic distribution? Is it correct: 1) mean-median=0 2) skewness=0 I think that it is very difficult that...

• Replies: 2
• Views: 7,947
08-19-2008, 12:57 PM
10. ### Does Anybody Recognize This (Obscure?) Confidence Table?

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...

• Replies: 6
• Views: 7,940
10-07-2011, 05:12 PM
11. ### ANCOVA when variances are not equal?

I am currently writing a 4th year freshwater biology report analysing data collected on the length and weight of fish from 2 sites, collected over 3...

• Replies: 6
• Views: 7,940
02-07-2016, 11:54 AM
12. ### Meanings of a set of data

Hi, My name is ngungo, means innocent or ignorant, and I am new here. I am a retired Computer Process Control Engineer. I had few statistics...

• Replies: 36
• Views: 7,933
07-10-2012, 07:11 PM
13. ### Interpreting Wilcoxon results - median or ranks?

Hi all, I have been using Wilcoxon tests for ages but am now wondering if I have been interpreting them incorrectly all this time. I'll use a...

• Replies: 2
• Views: 7,919
sab
04-20-2012, 05:18 AM
14. ### Best book on mathematical statistics

Hi Please advice me a good book on mathematical statistics.I want it to be oriented in math students or engineering level. Best Regards

• Replies: 2
• Views: 7,910
06-29-2013, 10:45 PM
15. ### Percentile rank

Can someone help me with the following problem? Thanks in advance ! :) Jon Molnar will graduate from Carolina Forest High School this year. He...

• Replies: 2
• Views: 7,904
08-23-2005, 11:16 PM
16. ### 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: 7,901
11-30-2010, 12:47 AM
17. ### Justify the use of parametric tests on non normally distributed data

Hello there. I have 5 Likert scale questionnaires that have been answered by the same people who have been randomly selected (N=24) and i have the...

• Replies: 4
• Views: 7,900
03-16-2014, 03:48 PM
18. ### What is the percentage increase in the number of days on the disabled list

I really really need help here "Injuries to Major League Baseball players have been increasing in recent years. For the period 1992 to 2001,...

• Replies: 1
• Views: 7,898
SPR
03-17-2011, 08:34 AM
19. ### Ungrouped data

Hi. First off thanks for this community, it has helped already. I have a midterm review sheet and the following is on it: Data is given and...

• Replies: 1
• Views: 7,897
10-24-2008, 11:43 AM
20. ### Understanding the math behind logistic regression.

Please take a look at the following page: http://statpages.org/logistic.html If you click the solve button the results window will carry out...

• Replies: 5
• Views: 7,890
10-23-2010, 11:30 PM
21. ### Covariance of a Joint Density Fxn

Okay, so this is supposed to be an "easy" problem on my assignment. Am I making this out to be more difficult than it is? Here is the initial...

• Replies: 5
• Views: 7,889
10-18-2010, 01:24 PM
22. ### Stepwise Ordinal Logistic Regression

How do I run a Stepwise Ordinal Logistic Regression in SPSS (v. 16)? If I can't... what about SAS? Thanks!

• Replies: 1
• Views: 7,880
09-04-2008, 04:46 PM
23. ### Theoratical

2. The value of the z-score in a hypothesis test is influenced by a variety of factors. Assuming that all other variables are held constant explain...

• Replies: 3
• Views: 7,880
10-15-2010, 02:54 AM
24. ### How to determine sample size for non-parametric data?

We recently performed some tests where the 41 data points were determined to not be normal and could not be transformed. Is there any way to...

• Replies: 4
• Views: 7,864
06-05-2009, 03:13 PM
25. ### When to Use Chi-Square Versus ANOVA

Hello, all! :) Warning! This is a long one. What do you think?

• Replies: 2
• Views: 7,853
07-30-2008, 12:09 PM
26. ### Help with gathering statistic information.

Here is what I have done thus far. I can identify what each of the required information is, but I don't think I'm getting it exact. Here is my...

• Replies: 4
• Views: 7,843
11-04-2013, 09:02 PM
27. ### Min sample size for Wilcoxon Rank Sum test

Hi, I have data measurements (eg, running cost) that keep coming in to the system continuously. There are two groups (say X and Y) that I want to...

• Replies: 5
• Views: 7,842
08-22-2013, 01:00 PM
28. ### Two-Way ANOVA without raw scores

Hey, I need to be able to perform a two-way ANOVA without raw data - i.e. with only means, standard deviations and sample sizes available. ...

• Replies: 4
• Views: 7,836
07-26-2008, 01:28 PM
29. ### Missing data - questionnaire with Likert scale data

Hi, I have a few questions, please enlighten me if you can! I have a questionnaire with 240 questions (Likert scale). There's a lot of missing. ...

• Replies: 0
• Views: 7,835
04-20-2010, 01:45 PM
30. ### Homework question

I am clueless as to how to answer this question. The United Nation declared that the worl's six-billionth inhabitant was born on October 12, 1999...

• Replies: 4
• Views: 7,812
03-24-2011, 03:22 PM
31. ### left-hand-tailed chebyshev (Cantelli's) inequality

I'd like to use the one-tailed chebyshev inequality to help me describe some weather data. The proper inequality as I understand it is:...

• Replies: 3
• Views: 7,809
12-14-2007, 02:43 PM
32. ### k-value selection with Tukey HSD

I have a question about Tukey’s HSD post-hoc test. My concern is selecting the appropriate K-value used along side the Error DF term to select...

• Replies: 3
• Views: 7,808
08-04-2008, 12:16 PM
33. ### Is there a way to test the significance of a linear regression in excel?

Please bear with greenhorn. Thanks. ^^

• Replies: 3
• Views: 7,802
07-01-2010, 12:42 PM
34. ### Logistic regression vs T tests, and multiple response sets

Hi, this is a great forum you have here, so I thought I'd ask a small, silly question that's been bugging me for a while. A few weeks ago, I...

• Replies: 5
• Views: 7,794
11-22-2010, 10:05 AM
35. ### Hypothesis

5) A sample of 40 observations is selected from one approximately normal population. The sample mean is 102 and the sample standard deviation is 5. A...

• Replies: 1
• Views: 7,791
03-20-2008, 10:20 AM
36. ### Categorical Variables - Dummy Coding?

Hi - I have a question pertaining to a categorical predictor variable with 3 levels (high, medium, low), a continuous predictor variable on a 7-pt...

• Replies: 4
• Views: 7,789
05-18-2011, 10:07 AM
37. ### Mean vs. median

Can someone explain when the proper time would be to use median vs. mean. I have a lot of questions revolving around "was this the appropriate...

• Replies: 5
• Views: 7,777
09-23-2010, 12:44 PM
38. ### Correct Analysis Method for 1:1 and 1:4 Matched Studies with Continuous Outcomes?

I have several questions about analyzing 1:1 and 1:M matched studies that have a continuous outcome variables. 1.To determine difference in 2...

• Replies: 4
• Views: 7,777
10-08-2012, 02:13 PM
39. ### alternative for chi square

what is the alternative for (2x2 table) chi square if more than one cell has an expected value of less than 5, given that the sample size is more...

• Replies: 4
• Views: 7,773
09-15-2010, 08:30 PM
40. ### Independent Sample T Test - Levene's Test for Equality of Variances

Hi everyone! I am currently doing a dissertation for my undergraduate studies. I am currently stuck with a question about Levene's Test for Equality...

• Replies: 5
• Views: 7,771
12-13-2012, 09:48 PM
41. ### How many combinations?

Hi all - I wonder if this might be the place to to find an answer to this question. I am trying to work out whether a key-safe I am thinking of...

• Replies: 19
• Views: 7,768
08-06-2011, 10:32 AM
42. ### Can I interpret Cramer's V without seeing the chi square value?

Hi all, Is such data possible? The variables are not significantly related (p>0.05), but Cramer's V value of 0.6. What does it mean? I read...

• Replies: 0
• Views: 7,762
07-12-2010, 03:55 AM
43. ### Kurtosis - where does the minus 3 come from?

I've been trawling the web for an example for quite a while. I understand that the 3 corrects the kurtosis of the normal distribution - I'm just not...

• Replies: 2
• Views: 7,762
12-22-2010, 07:34 PM
44. ### Mode and the continuous uniform distribution

Hello. I'm interested in opinions (with reasons) on whether or not the continuous uniform distribution has a mode or not. There seems to be no...

• Replies: 1
• Views: 7,759
08-04-2009, 10:01 PM
45. ### Comparing groups - z-scores

I have two groups A and B. Each subject has provided scores on a number of tests, and I want to give each subject an overall score based on these...

• Replies: 2
• Views: 7,751
08-16-2006, 11:59 AM
46. ### Binomial Distribution

One classical experiment on ESP (extrasensory perception) tests for the ability of an individual to show telepathy-that is, to read the mind of...

• Replies: 3
• Views: 7,746
02-18-2016, 10:31 AM
47. ### Correlation of 3 variables

I am having problems with a small statistical analysis project. I have two input variables that when taken together should correlate with an...

• Replies: 5
• Views: 7,727
02-16-2009, 12:18 PM

An orange juice producer buys all his oranges from a large orange orchard. The amount of juice squeezed from each of these oranges is approximately...

• Replies: 6
• Views: 7,726
07-14-2011, 12:34 PM
49. ### Beta coefficients - making inferences about explained variance from betas

Hi, Although I like stats it's not my strongest point so I am trying to learn, thus, I acknowledge in advance that the following question is very...

• Replies: 6
• Views: 7,726
01-27-2014, 04:08 PM
50. ### Polynom/spline/function for "upper and lower limit" (± 2 SD)

I have some hemoglobin values from children aged 0-18 years. I'd like to produce reference ranges for hemoglobin based on these values. Let's say I...

• Replies: 3
• Views: 7,724
04-17-2014, 07:40 AM
51. ### mixed model ANOVA - non parametric version

Hi Folks, I have two groups scored on the same assessment at four timepoints. From what I understand these data would be appropriately analyzed by...

• Replies: 4
• Views: 7,708
11-10-2011, 09:20 AM
52. ### Inverse of the Standard Normal Cumulative Distribution Calculation

Hi Everyone, I'm trying to verify the calculation for the Inverse Cumulative Standard Normal Distribution Function represented by the Excel...

• Replies: 8
• Views: 7,704
10-02-2014, 10:39 AM
53. ### type I error - non parametric stats

i have run multiple non parametric stats to analyse my data. i read that you cannot make a type I error because the data is not normally distributed,...

• Replies: 1
• Views: 7,700
08-30-2006, 08:29 AM
54. ### What is the F-statistic?

I was asked to use the f-statistics to determine the overall significance of the regression equation which is y=12559.7477 + 4265.7566X, note that...

• Replies: 2
• Views: 7,696
03-28-2011, 02:27 PM

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