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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### 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: 66,691
09-30-2005, 09:44 AM
2. ### 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: 196,672
07-16-2014, 11:01 AM
1. ### hypothesis

Hi all, I have homework like this, it hard to me, please help 1/ Random samples of 1600 workers in Region 1 and 1400 workers in Region 2 have been...

• Replies: 2
• Views: 2,334
03-24-2015, 12:56 AM
2. ### help me solve these problems

I have two problem, please help, 1/ In a study of flight attendants, salaries paid by two different airlines were randomly selected. For 41...

• Replies: 1
• Views: 2,636
03-24-2015, 03:41 AM
3. ### hypothesis testing question

Of a random sample of 100 families in Richmond, 60 own a house. Is there sufficient evidence at the 0.05 level of significance to conclude that most...

• Replies: 0
• Views: 2,028
04-01-2006, 05:22 PM
4. ### infinite lag distribution proof

asdddddddddddddddddddddddddd

• Replies: 1
• Views: 3,761
BGM
05-24-2010, 11:57 AM
5. ### Proof unit price elasticity

Hey guys I'm a bit stumped on this question and i know it should probably be easy but can you please help me out. The Demand function for an asian...

• Replies: 3
• Views: 5,891
08-13-2010, 09:57 PM
6. ### Statistics Final Exam Question

Due to some gray area in a TA's grading, I am going to review my statistics final with my professor on Friday. There's some possibility of a grade...

• Replies: 1
• Views: 1,777
05-26-2012, 10:24 AM
7. ### How to comment a projection of data in Principal Composant Analysis?

From: A=\begin{bmatrix} 1 & 0 & 0\\ 0 & 0 & 1\\ 0 & 1 & 2\\ 2 & 2 & 1\\ 1 & 0 & 0\\ 2 & 3 & 2\\ \end{bmatrix}

• Replies: 0
• Views: 955
12-20-2015, 12:08 PM
8. ### Odds ratio/ Confidence Interval

Q1. IF the chi-square value equals 6.51 from a sample size of 56. What would we immediately know about the values of the lower and upper bound values...

• Replies: 1
• Views: 3,443
04-06-2011, 08:09 AM
9. ### Formula

Hi, Does anyone know the formula used to calculate this Random Variable X has mean 20 and standard deviation 5. Random variable Y has mean 35...

• Replies: 1
• Views: 3,061
06-04-2008, 08:17 PM
10. ### Hypothesis Test

n=45 sample mean = 17.1 sample std dev = 6.4 What is the probability that the sample mean differs from the true mean by 2 or more? Thanks in...

• Replies: 3
• Views: 1,318
08-27-2016, 04:33 PM
11. ### coefficient of determination with Kendalls tau

I know I can use a coefficient of determination with Chi square, but I need to know if I can use it with Kendall's tau. I'm working on my...

• Replies: 0
• Views: 3,544
03-09-2009, 06:13 PM
12. ### Which statistical test should i use ???

Im doing my dissertation looking at suicide rates in Liverpool from 2007 to 2010. I want to explore the relationship between age and gender and how...

• Replies: 2
• Views: 4,881
04-06-2011, 06:23 AM
13. ### Choice of the statistical method

Hi, I am new in statistics and I am writing here to get some hint for my research. I run a survey and now I got to process the answers. The example...

• Replies: 1
• Views: 1,465
10-03-2011, 11:32 AM
14. ### Canonical correspondence analysis using only 1 environmental variable?

Hi everybody, after being challenged by my supervisor to find the most suitable ordination technique to relate a veg communities to an environmental...

• Replies: 0
• Views: 2,976
01-25-2010, 09:13 AM
15. ### Performing a t-test on averages??

Is it "statistically legal" to perform a t-test on the averages of two groups? In other words, the data set values are averages themselves (example:...

• Replies: 0
• Views: 1,512
02-25-2013, 04:59 PM
16. ### Bias

I know only one definition of bias in statistics: the expected difference between the estimator and the parameter. Are there any alternative...

• Replies: 3
• Views: 261
09-13-2017, 09:43 AM
17. ### How to test for differences in annual changes?

am working on insurance data. My goal is to test the effectiveness of a campaign. I need to test the hypothesis whether the "year on year percentage...

• Replies: 0
• Views: 1,539
09-20-2011, 08:18 AM
18. ### Test of equal variance

when to perform test for equal variance, is it necessary to perform "Test of equal variance" before performing One Way AVAONA

• Replies: 3
• Views: 1,666
07-09-2014, 01:35 PM
19. ### P value interpretation

Hi , I am having a hard time understanding the concept of p value and also its interpretation. I know that I can interpret a p value of 0.80 as...

• Replies: 22
• Views: 39,149
11-28-2011, 02:45 PM
20. ### F test in TGARCH, EGARCH, etc

why the F test in TGARCH and EGARH model is always failed to reject Ho? anyone know the null hipothesis?

• Replies: 0
• Views: 2,031
06-12-2012, 12:39 PM
21. ### Individual Item T Test Question

Hi. I have a 18 item 5-point Likert type attitudinal pre-test and same 18 item post test. A group of 25 individuals completed a pretest then were...

• Replies: 2
• Views: 1,408
06-12-2013, 04:16 AM
22. ### Which Test should I use

Hi. A have a group of 200 law students who have finished their first year. They have completed a total of 7 courses. I am interested in being able to...

• Replies: 1
• Views: 1,302
06-20-2013, 03:01 AM
23. ### Absence of interaction. Planned comparisons.

Hi, I'm doing data analysis for one of my experiments. The design of the experiment is 2 (word frequency) x 3 (phrase type). Both main effects (word...

• Replies: 6
• Views: 7,600
05-15-2008, 03:31 AM
24. ### Hosmer-Lemeshow Test Table Interpretation

Hi! I need someone to interpret this. Sorry, I got no knowledge at all. I tried searching the forum but the analysis chapter of my thesis keeps on...

• Replies: 6
• Views: 4,159
05-01-2014, 10:19 PM
25. ### time series forecasting air pollution

Hi there, I was reading this article that says that IBM will be able to forecast air pollution 3 days in advance. ...

• Replies: 0
• Views: 1,110
08-22-2014, 06:24 AM
26. ### Entering interaction terms

I am new to this site, but have high hopes that I can find some relief. I have a question regarding entering interaction terms (moderation) in...

• Replies: 6
• Views: 1,443
01-20-2015, 08:14 PM
27. ### Regression Question

Hey Everyone, I'm having trouble with a case for grad school (MBA program). I have 5 years of monthly time series data for a manufacturing...

• Replies: 4
• Views: 2,374
11-11-2011, 06:11 PM
28. ### How to determine sample size for a cost-per-conversion experiment

Hi all, I am trying to perform a scientific experiment in online marketing which would be focused on lowering the cost per customer acquisition. ...

• Replies: 0
• Views: 624
10-27-2016, 08:51 AM
29. ### Replicated Latin square design

Replicated 5x5 Latin square design where there are two observations in each of the 25 cells of the design. How many degrees of freedom will...

• Replies: 0
• Views: 5,069
03-02-2009, 07:28 AM
30. ### Which ANOVA would be this?

Just getting confused but here is my work : I think since there are 2 independant measures(not shown here) and there are different participants used...

• Replies: 1
• Views: 1,402
04-13-2009, 11:47 PM
31. ### difference statistics

I have a few queries: 1. I am investigating into how beach nourishment schemes affect rates of change on a beach, so for 27 locations I have the...

• Replies: 0
• Views: 2,515
apb
02-22-2008, 12:00 PM
32. ### Calculating SATS-36 score for a group of students?

Hey guys, i just joined this and hope someone could help me out ?? I am currently undertaking a project at my university on students' attitudes...

• Replies: 0
• Views: 2,053
01-30-2011, 10:47 AM
33. ### 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: 4,493
01-30-2009, 04:35 PM
34. ### 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: 8,312
05-07-2012, 04:03 AM
35. ### Comparing Likert-type scales

Please Help! I have looked at other threads on this site regarding Likert scales but was not able to find one directly related to the question I...

• Replies: 1
• Views: 5,829
02-10-2010, 04:52 PM
36. ### What test is best!

Hopefully this is a quick question for all you statistic gurus! If I am using the same survey to measure the same respondents to a 10 session...

• Replies: 1
• Views: 2,024
05-24-2010, 09:12 PM
37. ### help which test?

ok if I have 2 proportions from 2 different times but these are not fully paired data, would I do a case-wise deletion of unpaired data and use...

• Replies: 0
• Views: 2,040
11-08-2010, 03:56 AM
38. ### post hoc test for chi-square

ok this might be a newbie question but lets say I have data that I have cross tabbed for location and level of agreement. A ...

• Replies: 6
• Views: 10,635
12-22-2011, 06:07 PM
39. ### [SPSS] Comparing groups: variances are not equal

Hi, I have a data set which is normally distributed but the variances are not equal. I did transformation but this not work. which kind of test I...

• Replies: 3
• Views: 1,664
03-16-2015, 06:36 AM
40. ### Confused!

Hi, I have re-copied a question from my textbook and am confused as to what is meant by the question. I would really appreciate it if someone could...

• Replies: 0
• Views: 3,352
05-27-2009, 05:57 PM
41. ### Time Series/Trouble Identifying Model Type

Here is the question that I have: I'm having trouble identifying what kind of model that is. It looks like ARMA(2,1), but using first order...

• Replies: 0
• Views: 1,284
11-28-2012, 04:32 PM
42. ### Finding sum of mu(column)-mu

The question: I started with constructed an ANOVA table and worked backwards to get a value for SSE = 900 since I was dumb and thought ...

• Replies: 0
• Views: 1,697
02-16-2013, 01:38 PM
43. ### Fractional Factorial Experiment Design

I know that to get the alias rows with the main factor effects, I use mod 2 multiplication with the main effects and the elements of the defining...

• Replies: 0
• Views: 877
05-05-2013, 01:06 PM
44. ### Find the 95th percentile of a sampling distribution

I think I've got this, but I just want to confirm: I know that Z^2 follows a Chi-Square distribution with 1 degree of freedom. So to find the...

• Replies: 2
• Views: 4,383
09-08-2013, 10:16 PM
45. ### Show the two forms of the sample variance are equivalent

Show that the two forms are equivalent: \frac{1}{n-1} \sum_{i=1}^n (Y_i - \bar{Y})^2 = \frac{1}{2n(n-1)}\sum_{i=1}^n \sum_{j=1}^n (Y_i-Y_j)^2 I...

• Replies: 7
• Views: 2,412
09-12-2013, 09:07 PM
46. ### Finding MLE of a transformation

I think calling it a transformation is most accurate, anyways. Let X_1, X_2, \cdots , X_n ~ N(\theta, 1). Define Y_i = 1 if X_i > 0 or Y_i =...

• Replies: 9
• Views: 2,293
11-03-2013, 09:11 PM
47. ### Generating random variables without using inversion method.

Suppose that X has the pdf f(x) = |\frac{x}{4}| for -2 < x < 2. Draw f(x) and determine a method to generate X without using the inversion method. ...

• Replies: 2
• Views: 1,967
12-01-2013, 01:59 PM
48. ### Two rejection method problems

I'm rather shaky on the rejection method. I understand it in concept, but actually doing it... yeah. The first question involves the pdf f(x) =...

• Replies: 2
• Views: 1,020
12-02-2013, 04:33 PM
49. ### A couple linear algebra questions (including SAS proc iml)

EDIT: \sigma should be capital sigma, the covariance matrix, but I can't remember how to write it. First question Looking at Z, it's fairly...

• Replies: 1
• Views: 1,612
02-06-2014, 04:04 PM
50. ### Determining defining contrast subgroup from design matrix

I have the following design for studying five variables in eight runs in four blocks of size two (k=5, p=2, q=2) \begin{tabular}{rrlllllll} ...

• Replies: 1
• Views: 3,241
04-15-2014, 03:16 PM
51. ### Two way anova with no interaction

Information-a research psychologist is interested in determining the effects of high versus low intensity shock on the the memorization of a hard...

• Replies: 1
• Views: 3,016
11-03-2009, 10:34 AM
52. ### t-test:is it worth using if sample size is very small and results are very different?

Dear all, As part of a lab practical, I am comparing nitrite concentration in two different samples (sample 1 and 2). I only have three data for...

• Replies: 3
• Views: 1,961
03-16-2016, 11:44 AM
53. ### Standard Error of the Mean

I need to know how to combine data from two groups of means. They both have standard deviation and SEM's calculated for them each. If I then divide...

• Replies: 0
• Views: 2,040
01-31-2008, 12:08 PM
54. ### Restricted maximum likelihood (REML)

Hello everyone, For my Bachelor's thesis I have to estimate an overall mean and standard deviations using the restricted maximum likelihood (REML)...

• Replies: 0
• Views: 1,322
05-26-2015, 08:44 AM
55. ### MANOVA with dependent observations

Hi all, I am trying to do a MANOVA with four dependent variables and one independent variable consisting of four levels in SPSS. The problem is...

• Replies: 0
• Views: 1,986
10-19-2010, 06:02 AM
56. ### Floor and ceiling effects when measuring change

I am using a psychological measure with possible scores of 1 to 20. This is measured twice in the same participants (with 5 years between T1 and T2)....

• Replies: 0
• Views: 6,550
05-27-2009, 07:04 PM
57. ### plz help on any of these Q's

1. What can be seen by looking at a control chart of a dataset that can't be seen in a histogram, boxplot, or stem-and-leaf plot? I think it is time...

• Replies: 4
• Views: 2,364
12-08-2008, 10:31 PM

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