1. Announcement:
05-10-2017
Views:
1,951
Page 20 of 294 First 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 70 120 ... Last
Threads 1141 to 1200 of 17595

# 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: 197,244
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: 67,011
09-30-2005, 09:44 AM
1. ### Calculate Rho from Durbin-Watson Statistic

Have a test in an hour so probably wont be answered but on the practice test there is a question: "If the DUrbin-Watson statistic equals 1.6, then...

• Replies: 2
• Views: 7,444
12-04-2007, 12:47 PM
2. ### Using Standard Deviation to measure performance

I'm examining 21 years of data for the top performers of a company. Here are the median numbers for the top 24 (my baseline) performers: MEDIAN...

• Replies: 2
• Views: 7,433
02-12-2010, 10:49 AM
3. ### Central tendency and percentile

Can any of the following be true with a data set consisting of 1,000 values that are all different? If so, can you please explain why:eek: The...

• Replies: 8
• Views: 7,426
09-24-2010, 08:04 AM
4. ### Question about Chi-Square test and Bar graph

Hi, I have a quick question. Is a chi-square test appropriate with measurement or categorial variable? And is a bar graph useful to...

• Replies: 2
• Views: 7,423
04-02-2011, 11:10 PM
5. ### what is p value in correlation test when n increase?

hi everyone, since statistics and maths in general are not my forte, i'm having trouble. if anyone could help, i would be eternally grateful. the...

• Replies: 4
• Views: 7,417
04-11-2011, 08:02 AM
6. ### Binomial Probabilities

Please help me with these statistics problems! I'm really new to this online program for school and it's really hard without a teacher or peers to...

• Replies: 0
• Views: 7,404
04-23-2012, 01:10 PM
7. ### Follow up tests in 2x4 ANOVA (mixed)

I have 2 groups and 4 conditions. There was a significant group*condition interaction. To follow up this interaction, as there are only 2 groups,...

• Replies: 0
• Views: 7,402
04-03-2008, 05:58 AM
8. ### Is it valid/preferable to use non-parametric tests for parametric data?

Hello, I recently received reviews for a manuscript I wrote that used a mix of parametric and non-parametric statistics, as the tests I used were...

• Replies: 2
• Views: 7,401
11-09-2008, 05:40 PM
9. ### Derivation of chi-squared test for independence in 2 by k table

Hi everyone, I am attempting to understand the theory behind the popular chi-square test for independence for 2 x k tables. It has been...

• Replies: 3
• Views: 7,401
BGM
10-23-2011, 03:51 PM
10. ### Re:F-test for effect of two independent variable

Anyone know how do we use a F-test to see if the impact of two independent variable are the same? e.g the impact of gender and the impact of race...

• Replies: 11
• Views: 7,398
09-14-2010, 10:25 PM
11. ### 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: 7,397
04-14-2009, 05:47 AM
12. ### Would this Likert scale count as interval?

Hi everyone. A simple question please. I have been reading that there is a huge debate on whether nominal Likert scales (agree, disagree) can be used...

• Replies: 20
• Views: 7,396
07-03-2011, 11:17 PM
13. ### How do I choose the correct or appropriate statistical test?

How do I choose appropriate statistical tests for various exam questions? Specifically I am having trouble with deciding on the correct tests to use...

• Replies: 3
• Views: 7,394
06-09-2009, 04:35 AM
14. ### Calculating p-value for t value less than 1

I ended up with a t value of -0.47. So now I look at the t value chart, and I see all positive numbers, and all above 1. How can I get the p-value...

• Replies: 4
• Views: 7,391
06-18-2012, 11:20 PM
15. ### Difference between normal Q-Q plot versus "Detrended" Q-Q plots?

Hi and thanks for reading this post, I wanted to know if someone could explain the difference between these two types of plots? Thanks again,...

• Replies: 0
• Views: 7,389
11-18-2011, 08:57 PM
16. ### Graphing for precision/accuracy?

Hi everyone-- Hoping that this is the right place to ask this question. Was wondering if anyone can refer me to a resource to create a graph...

• Replies: 3
• Views: 7,388
10-17-2010, 07:44 PM
17. ### "independent of" vs "mutually exclusive"

Hi, I am a stats newbie. Sorry about asking this trivial question. Say I have a 2 x2 contingency table. The categories defining rows and...

• Replies: 4
• Views: 7,386
07-27-2011, 04:03 PM
18. ### restriction of range

Hi I am somewhat confused about something...I have read that ideally one wants to select a sample that is homogeneous. But doesn't this create...

• Replies: 2
• Views: 7,384
06-01-2009, 04:03 PM
19. ### standard deviation of replicates

Hi I have a samples set where each sample have been measured twice, that is, I have two technical replicates of each sample. Would it be...

• Replies: 1
• Views: 7,369
05-08-2010, 10:09 AM
20. ### SPSS Mann Kendall Test + Forecasting

I hope there is someone out there whom can advise.... Thanks.

• Replies: 0
• Views: 7,366
03-15-2011, 12:51 PM
21. ### Best software for multivariate analysis

Hello, I have an ntuple that I would like to do simple multivariate analysis on and just see the correlations among variables. I used to use ROOT...

• Replies: 3
• Views: 7,365
01-18-2010, 12:42 AM
22. ### Homogeneity - Box's M and MANOVA

Hi, I have (yet another) stats question! How do I go about testing for Homogeneity of variance-covariance when I plan to do a MANOVA? I've read...

• Replies: 1
• Views: 7,364
07-27-2008, 09:42 AM
23. ### Normal Distribution Curve

I just want to make sure I am getting this right. 0.0<z<2.85 .5000-.4978 =.0022 so I would shade in to the right of the curve. -1.38<z<0...

• Replies: 7
• Views: 7,352
05-10-2006, 11:24 AM
24. ### How to check association between an interval variable & nominal variable?

There is a collection of data of 2000 patients. I want to know the age of onset of Diabetes (an interval variable) has any relationship to the...

• Replies: 9
• Views: 7,352
12-06-2012, 07:30 PM
25. ### Need Help w/ correlation test assume regression inferences are met. Work answer out

A grass seed company conducts a study to determine the relationship between the density of seeds planted (in pounds per 500 sq ft) and the quality of...

• Replies: 1
• Views: 7,348
09-08-2005, 11:09 AM
26. ### level of significance test with no standard deviation

Hi, one question...been doing one and two tailed tests of level of significance but have a problem without a standard deviation...How do I proceed...

• Replies: 1
• Views: 7,337
04-14-2006, 02:10 PM
27. ### effect size and power

If i found no statistical differences between groups (t-test) it still make any sense to calculate the effect size and power? If so what is a...

• Replies: 1
• Views: 7,329
06-17-2009, 09:20 PM
28. ### ANOVA --- one factor vs. two factor?

Had a quick question when do we run a single factor run of ANOVA vs TWO FACTOR? The following question is what i'm working on, should i use...

• Replies: 0
• Views: 7,323
12-09-2008, 09:36 PM
29. ### Statistics on fold change

Hello everyone, This may be a basic question but I am facing a problem I do not know how to solve... Let me explain the situation : I am...

• Replies: 0
• Views: 7,322
12-18-2008, 12:10 PM
30. ### Calculating Seasonal Indices

Hello, I am interested in calculating seasonal indices of time series data with the following methods: 1. Method of simple averages 2. Ratio...

• Replies: 1
• Views: 7,321
03-10-2009, 09:41 PM
31. ### Non-probability sampling stuff

Hi there, Sorry probably asking a very basic question but just want to make sure... Am I right in saying that if I have surveyed people using a...

• Replies: 3
• Views: 7,314
09-09-2005, 03:23 PM
32. ### Logistic Regression Output

Hi, I have done a logistic regression but am having trouble interpreting the output. I looked at the effect of three vegetation types (H M L) and...

• Replies: 5
• Views: 7,313
09-06-2010, 02:57 PM
33. ### "Combined" Means and Variances?

Hi everyone. This is my first stat assignment of the semester and I am already confused. I'm not sure what my prof is asking. I will reproduce...

• Replies: 8
• Views: 7,313
09-13-2010, 08:07 PM
34. ### Computing Power

I know that power is one minus beta...but how do you calculate beta?

• Replies: 15
• Views: 7,309
10-12-2005, 11:25 PM
35. ### Permutation/Combination

I'm really stuck on these problems. I would greatly appreciate it if someone can help me. A computer hacker is trying to break into a computer...

• Replies: 2
• Views: 7,309
07-08-2010, 08:02 PM
36. ### 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: 7,308
09-17-2010, 10:25 PM
37. ### how is data affected if the same constant is added..?

I had to obtain results for specific data, and now I have a question that I don't understand. How is the mean, median and standard deviation...

• Replies: 1
• Views: 7,303
02-25-2008, 01:04 PM
38. ### simple slopes in 3-way moderated regression

Hi I am trying to work out how to do simple slopes test for a three way moderated regression. Here is how my data set looks: IV 1: dichotomous...

• Replies: 4
• Views: 7,300
11-14-2008, 11:39 AM
39. ### Normally Distributed Data Set

Hi there, sorry I am new here, but can any one point in the direction of data sets which passed test for normal distribution diagnostic and can...

• Replies: 1
• Views: 7,299
10-27-2011, 06:01 PM
40. ### [ AP STATISTICS ] Quiz 6.2B - Standard Deviation/ Mean Problem.

Solved. Mods may delete this now :)

• Replies: 2
• Views: 7,299
03-17-2014, 08:59 PM
41. ### interpreting ACF and PACF

I have a time series for which I want to check stationarity. But I don't know how to interpret the ACF and PACF function graphs and their respective...

• Replies: 0
• Views: 7,297
08-30-2009, 06:19 PM
42. ### Interrater Reliability estimate (pearson's r)

Hi All, I am in need of some help. I am trying to determine the correlation of 5 continuous variables to determine the interrater reliability...

• Replies: 1
• Views: 7,293
07-16-2014, 08:11 PM
43. ### When do I use which stats test?

Hi all, I have a homework question as follows: A technician in a clinical lab is released to do routine glucose analyses when the data obtained by...

• Replies: 4
• Views: 7,280
11-15-2010, 07:49 AM
44. ### Calculating True Score Given Reliability and Total Variance

I've got a question about estimating a true score variance. I'm given the following info: a test contains 20 items, an individual's score was 80,...

• Replies: 0
• Views: 7,276
tk6
10-28-2012, 12:25 AM
45. ### Expected Value and Standard Dev.

I need some guidance with the following...please help!! Scenario: You pay $10 and roll a die. If you get a 6, you win$50. If not, you get to...

• Replies: 0
• Views: 7,275
10-16-2006, 06:15 PM
46. ### unequal sample sizes

I'm hoping for help on dealing with unequal sample sizes. Any assistance is greatly appreciated. I'm currently working with data from...

• Replies: 3
• Views: 7,270
06-23-2009, 07:52 PM
47. ### Perhaps statistics is not for me.

• Replies: 2
• Views: 7,269
07-18-2008, 06:45 PM
48. ### Standard Deviation or Average Rate of Return

I had this question on a quiz and I felt there were two correct answers, tell me what you guys think. This table shows returns on two different...

• Replies: 2
• Views: 7,262
cjb
09-15-2009, 05:24 PM
49. ### Statistics on zero values?

Sounds a bit silly, but can i do any "control vs test" stats when the control data are all zero? I am adding a chemical to cells, and measuring...

• Replies: 2
• Views: 7,254
12-20-2010, 05:33 PM
50. ### 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: 7,253
05-28-2009, 08:26 PM
51. ### Can there really be no significant difference?

Hi, I have a study with 73 participants (32 in group A and 41 in group B). In response to a yes/no item 41% of those in group A and 22% in group B...

• Replies: 6
• Views: 7,252
06-22-2009, 05:08 PM
52. ### Sos: Get expected value & variance of dependent variable, pls. See the problem

Suppose that a firm's total costs are given by C = 2 + 15Q, where Q represents the firm's output. The expected values and variance of output; E(Q)...

• Replies: 6
• Views: 7,246
02-25-2011, 08:48 AM
53. ### Unweighted and Weighted Data (Chi Square)

Here's my situation: I have a dataset with unweighted data taken from a small, annual survey. I also have a large dataset with weighted and...

• Replies: 0
• Views: 7,239
01-19-2007, 08:38 AM

Use this control to limit the display of threads to those newer than the specified time frame.

Allows you to choose the data by which the thread list will be sorted.

Note: when sorting by date, 'descending order' will show the newest results first.