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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: 196,722
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: 66,733
09-30-2005, 09:44 AM
1. ### The other formula for SD

We all know the formula for SD But I recall a pal of mine long long ago showing me another formula for working out SD that - he argued - was far...

• Replies: 7
• Views: 9,723
01-01-2013, 03:36 PM
2. ### Census vs. Sample

I am looking for more clarification on how a census survey is usually analyzed and reported. While there is a lot of information on how to go about...

• Replies: 7
• Views: 8,322
05-07-2012, 04:03 AM
3. ### Standard deviation of the Ratio of two means

Hi, guys I have two sets of data: A and B. I want to calculate a ratio of average(A)/average(B). I wonder if there is a way to get the...

• Replies: 7
• Views: 54,759
07-08-2012, 09:36 AM
4. ### Correlate a continuous with a binary variable

Hey everyone. I have a simple problem and was hoping to get your advice with. I am trying to correlate a continuous variable with a binary one....

• Replies: 7
• Views: 52,523
02-08-2012, 09:43 PM
5. ### Outliers and multiple linear regression

I was reading about diagnostics with respect to outliers and it talks about studentized residual, cook's d and jackknife that detect how an outlier...

• Replies: 7
• Views: 3,414
02-12-2012, 09:41 PM
6. ### strength of predictors in MR

Hello, I have a stats question related to interpreting results from multiple regression. If you are running a multiple regression with four...

• Replies: 7
• Views: 1,908
03-06-2012, 10:52 AM
7. ### What statistical test do I need to use?

Hello, I have done an experiment in my coursework and want to find out what the differences are between three groups. The experiment looked at...

• Replies: 7
• Views: 3,490
02-17-2012, 05:05 PM
8. ### Student's t-distribution table

Dear all, In a Lineair Single Regression example, I have a hypothesis: H_0: ß = 0. Normally T will than be: T= (b - ß) / se(b) but, since I...

• Replies: 7
• Views: 4,312
03-04-2012, 07:15 AM
9. ### Linear Regression Question

If rxy=.79, then we could predict y to be ____________ if x is a high score? a. high b. low c. consistent d. undertiminable I believe the...

• Replies: 7
• Views: 3,344
03-11-2012, 01:04 AM
10. ### I am not sure how Central Limit Theorem, and the t-distribution fit together.

Hello, By Central Limit Theorem CLT if the sample size is large enough, the distribution of the sample means is approximately normal. This result...

• Replies: 7
• Views: 7,412
BGM
03-14-2012, 12:36 PM
11. ### How many yellow balls in the basket?

I have 48 baskets that contain 100 balls in 10 different colors randomly placed. There is anywhere from 1 ball to 10 balls in each basket, but no...

• Replies: 7
• Views: 2,446
03-14-2012, 08:49 AM
12. ### Having trouble identifying orthogonal contrasts

Hi there My task is to figure out which pairs of contrasts are orthogonal to one another Group 1 Group 2 Group 3 Group...

• Replies: 7
• Views: 3,638
03-17-2012, 08:43 PM
13. ### Acceptance Sampling

We are working on continuity corrections and using normal distribution to approximate the binomial distribution. I breezed through 22 questions but...

• Replies: 7
• Views: 4,411
03-23-2012, 04:16 AM
14. ### What does it mean to have only the intercept term in the model? (and Type 1 SS qs)

This never made sense to me. How is it even a model when there is no variable? How do you write the code, for just the intercept term in the...

• Replies: 7
• Views: 2,431
04-06-2012, 07:50 PM
15. ### A question on central limit theorem

Hi I have a quick question on central limit theorem. I am missing something obvious so hoping someone can help. If we had a sample set of say...

• Replies: 7
• Views: 2,914
05-03-2012, 12:39 PM
16. ### Multiple linear reg (some obs. not independent)

Building a multiple linear reg. model. Some patients (less than 10% I suspect) underwent the same procedure twice and are listed as two seperate obs....

• Replies: 7
• Views: 2,759
05-06-2012, 01:58 PM
17. ### Test Hypothesis and Significance

Is it possible to test a hypothesis to show that there is no significant difference between two averages without a standard deviation for both sample...

• Replies: 7
• Views: 2,025
05-11-2012, 03:38 PM
18. ### How to test significance on one sample rating for >1 variables (ie 2 or 3 brands)?

Hi all, This is for application in market research... Suppose that I interview 100 people randomly regarding their opinions on Republicans and...

• Replies: 7
• Views: 1,784
05-18-2012, 04:46 AM
19. ### Normal distribution and population data

A question of more general nature: If i'm working with population data (i.e., not a sample from a larger population), to what extent should i care...

• Replies: 7
• Views: 1,889
05-20-2012, 11:28 AM
20. ### Weighted Performance Ranking

Hello! I have 1200 accounts that need to be ranked against one another according to performance across 12 different key performance indicators. ...

• Replies: 7
• Views: 2,951
05-27-2012, 03:14 PM
21. ### Basic Expectation

hi guys, this problem looks simple but tricky. give it a try. Q. Suppose X1 and X2 are real-valued random variables with f as their common...

• Replies: 7
• Views: 2,231
05-28-2012, 01:20 PM
22. ### Poisson Regression and Cost data?

Hello all, I am working with cost data based on a number of variables as well as population size. I know that poisson regression is used with...

• Replies: 7
• Views: 4,053
07-02-2012, 09:58 AM
23. ### Using the proper statistical term in reports

Hello everyone, I am writing up a report now for my end of block assessment, and my supervisor told me that I need to use the proper "statistic...

• Replies: 7
• Views: 1,902
08-13-2012, 05:11 PM
24. ### Integration of a standard error

Hi there, I have performed linear regression on my data using sigma plot. My specific interest is in the area underneath the regressed curve....

• Replies: 7
• Views: 760
08-21-2012, 03:42 PM
25. ### F-test equality coefficients same model

Hi, I have binary logistic model with only binary independent variables (which were originally 3 multi-valued nominal variables). For example,...

• Replies: 7
• Views: 5,338
08-26-2012, 06:53 AM
26. ### Binomial test to determine if one animal is following another.

Hi all, I have a number of videos showing two species of animals arriving at a resource and I want to determine if species 2 is following species...

• Replies: 7
• Views: 1,941
09-03-2012, 10:58 AM
27. ### Maximum likelihood estimator - geometric distribution

Need help getting the MLE. Problem defines the geometric distribution as pi(1-pi)^y

• Replies: 7
• Views: 4,158
08-28-2012, 10:32 PM
28. ### Determining Minimum Sample Size To Accurately Reflect Original Distribution

Hi, I have an intensive computer simulation and i'm looking for a way to save some time! In the simulation, i run a given model (of which there...

• Replies: 7
• Views: 1,833
09-02-2012, 04:13 PM
29. ### Is one-way anova appropriate test

Hello everyone, I have to determine if there is the difference in energy consumption between four equipment operators. Is the one way anova...

• Replies: 7
• Views: 2,132
09-07-2012, 12:50 PM
30. ### Minimum sample size for paired t-tests

Hi All, I remember reading somewhere that the minimum sample size to conduct paired t-tests was ~30, as this will ensure that there is adequate...

• Replies: 7
• Views: 19,702
09-23-2012, 12:48 AM
31. ### R question

Any suggestions to find a formula relating R-square and the F-test for regression.

• Replies: 7
• Views: 3,070
09-22-2012, 09:21 AM
32. ### Correlation Question w 3 variables

Can someone please tell me how it is possible for X to be correlated with Y and Z to be correlated with Y, but X and Z be uncorrelated? I'm having...

• Replies: 7
• Views: 2,285
09-24-2012, 06:10 PM
33. ### Interpreting Confidence Intervals

Hey everyone. I am trying to answer a question on my homework. If the confidence intervals are both negative (i.e. the lower and upper bound) then do...

• Replies: 7
• Views: 3,798
09-26-2012, 08:29 PM
34. ### Using Hypothesis test for decision making - find if sample represents the population

Hi All, I work with an NGO and we have a telemarketing department which purchases phone number databases for calling and marketing our cause. We...

• Replies: 7
• Views: 2,766
10-19-2012, 05:44 AM
35. ### Kruskal Wallis or One way analysis of variance- which is more suitable?

Hello, I am currently working on an assignment which describes 2 clinical trial scenarios. I will outline both first: 1)Compare the...

• Replies: 7
• Views: 1,622
11-24-2012, 01:59 PM
36. ### Non normality in residuals in SLR

Hey guys. I've done a SLR and after testing the residuals for normality using the Shapiro-Wilk test and I've learned that the residuals are not...

• Replies: 7
• Views: 2,295
12-13-2012, 03:26 AM
37. ### Statistical analysis of Profits - use of U-test

Hi We have been working on a project where we have 2 or more trading agents on a market stock and for the outcome we have the profits that each...

• Replies: 7
• Views: 2,010
12-08-2012, 03:12 AM
38. ### Likert items-->Likert scale-->analysis

I'm working on a research project trying to identify motivation types and self-identity changes of the participants. Then I have to do group...

• Replies: 7
• Views: 1,761
12-17-2012, 06:25 PM
39. ### Correlation

Hi, I've two monthly datasets: The first , the Percentage of people who intend to buy a house within the next 6 months (for example in December it...

• Replies: 7
• Views: 2,054
GIS
01-01-2013, 03:34 AM
40. ### Statistics- Confidence Interval Estimator

I have a question which I am stuck on. I have tried to solve it but am quite wary if I am heading in the right direction. The question is as follows:...

• Replies: 7
• Views: 2,368
01-24-2013, 11:39 AM
41. ### How to calculate significant differences

Hi Everyone.. I am stuck on one of my assignment questions. I have two samples, let's say List of employees in one Department A each with an...

• Replies: 7
• Views: 2,718
01-23-2013, 12:55 PM
42. ### Most wins over time

Hey, I am not very good at stats, but I have a question. Statistically speaking, if you could create a draw, with whatever amount of tickets...

• Replies: 7
• Views: 1,908
01-13-2013, 07:14 PM
43. ### Compare 2 tests and choose the one that provide more results

Hi , I have 2 tests, one will give me results for more cases (80%-90%) and another test will give me some results (60%-70%). How can I say or prove...

• Replies: 7
• Views: 2,427
01-01-2013, 06:06 PM
44. ### The number of people in the US measured by the Census

The number of people in the U.S. as measured by the U.S.Census is a ? There are a few choices: In my opinion, it is either (B)...

• Replies: 7
• Views: 1,930
12-25-2012, 01:52 AM
45. ### Geometric trends linear estimation

The following records are available for a parameter \Phi \begin{tabular}{|c|c|c|c|} \hline Year & $\Phi$ & Year & $\Phi$ \\ \hline 1989 &...

• Replies: 7
• Views: 1,554
03-03-2013, 09:18 AM
46. ### Skewed Continuous Predictor - dichotomize or treat as continuous?

Hello All, I have two scales with 7 binary items. The simple raw scores from these scales (summing the item responses of 0 or 1) are very skewed...

• Replies: 7
• Views: 3,426
02-28-2013, 03:46 PM
47. ### Central limit theorem and statistical process control

Hello I have a question...according to the central limit theorem, we say that if I have a sample X1,...,Xn, and if it's not necessarily normally...

• Replies: 7
• Views: 2,076
01-29-2013, 03:42 PM
48. ### Absolute beginner needs help deciphering question

Hi there. I am an absolute novice to statistics, and have had no formal education in it since year 9 at school when we did box-plot diagrams. I...

• Replies: 7
• Views: 1,485
02-22-2013, 06:06 PM
49. ### measures of variation

An instructor compared two teaching techniques to see which was most successful in reaching the students. Results of the experimental and control...

• Replies: 7
• Views: 1,556
02-22-2013, 03:22 PM
50. ### t-Test help: Two-Sample - Difference between assuming equal vs. unequal variances?

Hello all, I'm needing some help here. I'm trying to figure out whether or not my statistics problem would use the "t-Test: Two-Sample...

• Replies: 7
• Views: 76,184
01-25-2013, 01:15 AM
51. ### planned comparison (post hoc) with fewer than 3 groups?

Say you've found that the IV "sex" has a significant effect on your DV, but you want to know the nature of that effect. If your IV were something...

• Replies: 7
• Views: 2,460
02-28-2013, 03:44 PM
52. ### T-Test with Chi-Square

Is the t-test always used with chi-square?

• Replies: 7
• Views: 1,708
02-26-2013, 10:18 PM

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