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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: 196,679
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: 66,703
09-30-2005, 09:44 AM
1. ### Needing help with understanding sampling error

hello forum, i am having some trouble understanding what sampling error is. could you explain to me what this explains? and if i had a boss and he...

• Replies: 2
• Views: 682
12-12-2015, 06:35 PM
2. ### Sample Size Selection

Hi All I am having trouble with a sample size selection. I would like to run a study on the following applications to a program and record how many...

• Replies: 0
• Views: 1,163
12-12-2015, 03:10 PM
3. ### Which analysis should I choose

Here are 2 situations: A. Experimental program vs. traditional program. Which one is the best? - 130 kids, 60 in the experimental program and 60...

• Replies: 0
• Views: 920
12-12-2015, 02:58 PM
4. ### Scoring System Help Please

Hi, Im currently completing a research proposal and need to create a scoring system. I have two sets of data which I'm comparing statistically....

• Replies: 0
• Views: 889
12-12-2015, 12:26 PM
5. ### Comparing multiple groups - What test should I use?

Good evening, everybody. I'm currently running tests on a sample and I'm not sure which test should I use to compare different groups. I'll...

• Replies: 1
• Views: 1,172
12-11-2015, 12:49 PM
6. ### Data with > values

Okay, so with the data set I currently have I would usually run a one way ANOVA with probably a Dunnets post hoc test to compare and find the...

• Replies: 4
• Views: 1,679
12-10-2015, 10:24 PM
7. ### Sampling Distribution, Probability of Selecting One Random Individual

In a large population of college-educated adults, the mean IQ is 118, and the standard deviation of their IQs is 20. Suppose 200 adults from this...

• Replies: 2
• Views: 2,022
12-10-2015, 12:16 PM
8. ### Comparing the rate of two clinical events

Hi Guys, I'm working on a clinical research project and trying to figure out the best test for comparing the rates of clinical events. Basically,...

• Replies: 5
• Views: 1,794
12-10-2015, 08:43 AM
9. ### Normal distribution question help

Assume a normal distribution with a known standard deviation, with 34% of the observations contained in the interval μ±a. If the standard deviation...

• Replies: 1
• Views: 1,148
12-09-2015, 11:52 PM
10. ### PDF of LogNormal distribution from random numbers

Dear all, I have trouble understanding why "textbook" formula for probability density function (PDF) of lognormal distribution is different from...

• Replies: 3
• Views: 2,480
12-08-2015, 02:06 PM
11. ### ROC using only binary outcome data

Hi everyone, I have recently started learning application of statistical tests for data analysis. I had a question: Is it possible to plot a ROC...

• Replies: 1
• Views: 1,297
12-08-2015, 10:31 AM
12. ### goodness of fit test( chi square test)

i want to find out test statistics and p value of different probability distribution by using chisquare test. distributions are 1. normal 2....

• Replies: 0
• Views: 1,214
12-08-2015, 04:53 AM
13. ### Question about which test to use

Hi there everyone, I apologize if this is in the wrong section. It is not technically coursework but is elementary (I think) so I put it here! ...

• Replies: 1
• Views: 1,363
12-08-2015, 02:59 AM
14. ### The difference between R squared and adjusted R squared

if your R squared - 0.999 and adjusted R squared = 0.998 what can you infer from this difference (lack of difference) in a multiple regression model...

• Replies: 4
• Views: 4,034
12-07-2015, 12:25 PM
15. ### After a significant MANOVA, is the next proper step to run univariate ANOVAs?

So I've heard both sides of this and am curious what you guys think. Some sources that I have read have said that after a significant MANOVA, you...

• Replies: 0
• Views: 909
12-06-2015, 07:51 PM
16. ### Empirical (Sample) Variogram

Hi, I was looking online and I found that some sites say that the empirical variogram is the same as the semivariogram (variogram) but some sites say...

• Replies: 0
• Views: 1,093
N2S
12-06-2015, 05:26 PM
17. ### Hypothesis:

If you wanted your null hypothesis to be that y and x are linearly related, and your alternative to be that they are quadratic. What could you use as...

• Replies: 0
• Views: 1,164
12-06-2015, 10:59 AM
18. ### Regional analysis of disease risk factors

I'm working with a large data set looking at climate variables e.g maximum, minimum temperature etc to see whether these could be risk factors for...

• Replies: 4
• Views: 1,147
12-06-2015, 08:28 AM
19. ### Going to Fail Statistics... Please be kind and help me

If there is any information regarding statistics at the most basic level (113), formulas, central limit theorem, probability, means of means,...

• Replies: 1
• Views: 1,199
12-06-2015, 02:20 AM
20. ### Spss arima

I am using SPSS to forecast a time series model. All I have are values and dates. It automatically gives me the best fit model using either ARIMA or...

• Replies: 0
• Views: 1,009
12-04-2015, 05:35 PM
21. ### Empirical Research from a Sample

Hi, Im looking for some help carrying out empirical research that I need to do for an assignment. The data is based on a sub sample of a survey given...

• Replies: 0
• Views: 1,303
12-04-2015, 09:38 AM
22. ### grad school final

I need help determining correct tests to run given a data set and questions. If anyone knowledgeable could email me? justmeandk@gmail.com

• Replies: 1
• Views: 1,139
12-04-2015, 02:38 AM
23. ### need help

The mean incubation time of fertilized eggs is 23 days. Suppose the incubation times are approximately normally distributed with a standard...

• Replies: 1
• Views: 2,140
12-03-2015, 11:04 PM
24. ### Which tests should I use?!

Hi, I need to complete a few tests for my third year psychology dissertation, I got results in from a questionnaire but I dont know which tests will...

• Replies: 1
• Views: 1,189
12-03-2015, 04:56 PM
25. ### Zero Inflated Model(s)

Hello all, I'm working on a paper on the spatiotemporal distributions and abundances of rock pool fish. Over a couple of years, every month, the...

• Replies: 2
• Views: 1,374
12-03-2015, 04:54 AM
26. ### Is it possible to calculate margin of error when sample does not have a normal distri

thank you for the answers guys

• Replies: 4
• Views: 1,432
12-02-2015, 04:37 PM
27. ### One-factor and two-factor ANOVA questions!

I've got two quick questions about the interaction term in a two-factor ANOVA. First, what does the interaction term exactly mean? For example, say...

• Replies: 2
• Views: 1,574
12-02-2015, 02:58 AM
28. ### ANOVA - Uneven observations p/condition but same sample size

Good Day everyone, Hope all is going well. This is my first post on this forum so I hope I am doing it right. I saw another post on a forum and...

• Replies: 0
• Views: 1,078
12-01-2015, 01:30 PM
29. ### Interpretation of Coefficients in Granger Causality Analysis

Hi. I am currently reading a study using Granger causality analysis which unfortunately is far beyond my statistics introductory course. Even with...

• Replies: 1
• Views: 1,143
12-01-2015, 12:22 PM
30. ### Confidence Interval Question

How would I solve this problem? A study of the fall lobster catch showed that for 35 lobsters lobsters selected at random the mean weight was 2.9...

• Replies: 1
• Views: 1,775
12-01-2015, 05:23 AM
31. ### Steel Dwass test original paper

Hi, I was wondering if anyone can find the original paper for Steel-Dwass test from 1960 as Google couldn't help me on this? I just need to...

• Replies: 1
• Views: 2,176
11-30-2015, 08:36 PM
32. ### Unequal Sample Size and Wilcoxon Rank Sum Test

thank you for the answers guys

• Replies: 4
• Views: 3,741
11-30-2015, 04:26 PM
33. ### Main effect vs. Interaction effect in ANOVA

I think that a researcher is in general more likely to find a significant main effect than a significant interaction effect in ANOVA. Do you agree...

• Replies: 11
• Views: 2,531
11-30-2015, 04:04 PM
34. ### Matched-Guise Test (MGT) Statistical Analysis

Hi all, I'm working on a study focussing on speaker attitudes to different dialects. I'm obtaining data via MGT: 8 recordings (4 'standard...

• Replies: 0
• Views: 1,368
11-30-2015, 07:10 AM
35. ### [SPSS - wilcoxon/paired t test] - not normally distributed data

Hello! I ran an analysis of my data of research into a repeated measures design and found the difference of both conditions to be not normally...

• Replies: 4
• Views: 3,150
11-29-2015, 09:13 PM
36. ### Random values from a normal distribution when n=1 or small?

Hello. Maybe my question is a bit weird, but I have a problem. The times people have when they leave a building during a evacuation follow a normal...

• Replies: 3
• Views: 1,495
11-29-2015, 08:20 PM
37. ### How to convert a scaled score to a T-score?

What is the formula for converting a scaled score (mean 10, SD 3) to a T-score (mean 50 SD 10)? Maths, statistics, and life aren't my strong...

• Replies: 3
• Views: 1,285
11-29-2015, 03:27 PM
38. ### Reliability

hi i have a question here suppose a test has 50 dichotomous items. the sum of the variances of the items is 7 and the variance of the total score...

• Replies: 1
• Views: 1,731
11-28-2015, 04:09 PM
39. ### Removing sig main effects to see a sig interaction effect (logreg)

Hello, I am doing research right now and have been looking for some interaction effects, I have found a non-significant interaction effect...

• Replies: 3
• Views: 1,512
11-28-2015, 02:48 AM
40. ### Standard Deviation

My instructor has asked me to analyze three different surveys to determine if the correct sample size was chosen. However, I do not have access to...

• Replies: 1
• Views: 1,440
11-27-2015, 10:37 AM
41. ### unbiasedness

I have difficulties with solving this problem, please help! Let X1;:::;Xn be i.i.d. ~ Exp(lambda) with unknown parameter lambda > 0. Check if...

• Replies: 0
• Views: 1,324
11-27-2015, 10:10 AM
42. ### indicator or simple reference category (logistic regression)

Could someone please explain to me when exactly I choose either/or indicator or simple reference categories for variables in logistic regression? ...

• Replies: 0
• Views: 1,178
11-27-2015, 04:28 AM
43. ### What test to use to compare 3 variables

I have a homework question that has a table of 3 variables and asks if they differ: "Your sales (in sodas per hour) for 5 sections in each of the...

• Replies: 1
• Views: 898
11-27-2015, 03:36 AM
44. ### Use interaction effect or main effect

Hello, Looking for a little advice please. I have run several logistic regression models in spss, I have found a statistically significant...

• Replies: 0
• Views: 961
11-26-2015, 10:27 PM
45. ### Monte Carlo Integration with Computationally expensive Integrant

Consider \mathcal{R}_x = \int_{x'} C(x|x')P(x')dx', where \mathcal{R}_x = risk of following input x C(x|x') = cost of following input x when in...

• Replies: 0
• Views: 853
11-26-2015, 12:40 PM
46. ### chi-square test with very uneven binary variable and an ordered variable

Hello everyone, this is probably a quite simple question, yet I would like to ask it here. I want to run a chi-square test between one binary coded...

• Replies: 3
• Views: 1,163
11-26-2015, 03:35 AM
47. ### How to do the Time Series Forecasting, the right way?

Hello all, I don't know much about the topic, but I want to learn. I have been given a time series in the form of (date, number). and I need to...

• Replies: 1
• Views: 1,258
11-25-2015, 02:06 PM
48. ### Could you help to find useful method for my purpose?

Hi everbody, I need to find a method which can answer my question: I have several parameters (at least 3) which are formed of raw data...

• Replies: 2
• Views: 995
11-25-2015, 11:42 AM
49. ### Compare odds in two fisher tests

Dear all, I performed 3 fisher tests from data implicating in each test the same two sets (A & B) with two different sets in each case (A&B vs...

• Replies: 6
• Views: 1,603
11-25-2015, 06:08 AM
50. ### Create lognormal from a normal distribution

Hello All, For a research I am doing I have a source that says that the range is 120 seconds to 1260 seconds, and that the mean is 356. Also, that...

• Replies: 10
• Views: 2,078
11-24-2015, 05:34 PM
51. ### Which method to use when sample sizes are very different?

Dear All, I'm trying to analyze the significance of difference between two groups. However the two groups have different sample size (one has 213...

• Replies: 5
• Views: 1,569
11-24-2015, 04:01 PM
52. ### constructing a table from a binomial experiment

Hello all new here and this is my first post. I am looking to check my work before I turn it in and hope that you will help me with that so here is...

• Replies: 2
• Views: 1,455
11-23-2015, 10:18 PM
53. ### Can you help me decide if there is statistical significance here?

Hi, I've attached a word file - it contains exam results. There were two sessions - one AM and one PM. . I am trying to work out if there is a...

• Replies: 2
• Views: 1,227
11-23-2015, 12:28 PM

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