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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: 197,128
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: 66,938
09-30-2005, 09:44 AM
1. ### Uniforming data to produce better graph

Hello, forum! This is my first post here and I really hope someone can help me. I have to draw a graph of two very long columns of data. Both...

• Replies: 0
• Views: 1,186
03-07-2015, 02:42 PM
2. ### Analytical flow, correlation research

Hi Stat's experts. For my Experiment which I classified as Correlational research I will look for relations to Breathing pattern disorders (BPD)....

• Replies: 0
• Views: 951
03-07-2015, 05:22 AM
3. ### Hypothesis test help.

The temperature in degrees Fahrenheit of a random group of healthy adults are 97.0 97.4 99.3 97.7 98.6 99.7 97.5 98.7 96.9 97.9 97.3 ...

• Replies: 1
• Views: 1,236
03-06-2015, 04:46 PM
4. ### Test for differences across tasks according to group

Hello, Hoping someone can help as I am at a bit of a loss of what inferential statistics to run for my masters work. I have low anxiety and...

• Replies: 1
• Views: 1,271
03-06-2015, 02:47 PM
5. ### Variance in 2 data sets has led to variance in other 2 data sets

Hi, everybody! I have conducted a research aimed to determine the content of active ingredient of a brand drug. I have tested 2 strengths of the...

• Replies: 0
• Views: 1,273
03-06-2015, 04:21 AM
6. ### sample size calculation

I am trying to determine the necessary sample size I need for a study. Standard 80% power and </= 0.05 p value. The study is designed to use two...

• Replies: 0
• Views: 1,458
03-05-2015, 09:14 PM
7. ### Stat Help

never mind, solved it

• Replies: 0
• Views: 1,528
03-05-2015, 09:02 PM
8. ### Large dataset mixed ANOVA - problems with Levene's and outliers?

Hello, I'm a psychology student in need of a bit of help. I've run a principle components analysis on a large data set (N=824, 600 female, 224...

• Replies: 0
• Views: 2,513
03-05-2015, 03:53 PM
9. ### Time Series out of sample forecast period?

Hello everyone. It is my understanding that if one wants to built a time series model on data a time series that went from 2000 to today (2015)...

• Replies: 1
• Views: 1,014
03-05-2015, 03:41 PM
10. ### Normal Approximation to the binomial

I'm trying to calculate the probability that there are greater than 300 successes from a pool of 1000 trials. I am told to use the normal...

• Replies: 0
• Views: 1,074
03-05-2015, 03:01 PM
11. ### How to perform two samples z test in Doronix Math Toolbox?

I'm using Doronix Math Toolbox. But I can't find how to perform 2 samples z test there. Can anyone help me? Thank you very much.

• Replies: 6
• Views: 2,484
03-05-2015, 12:12 PM
12. ### Book

Hello, I need the recommendation of a book that covers the following topics: 1) Generation of pseudo uniform random numbers. 2) Simulation...

• Replies: 2
• Views: 975
03-05-2015, 11:52 AM
13. ### Mixed models - theoretical question

Hallo all, I'm reviewing an experimental design where the aim was to establish whether two groups of speakers were substantially different from...

• Replies: 1
• Views: 1,097
03-05-2015, 09:54 AM
14. ### multilevel linear model in SPSS (mixed model)

Hi, I have a hierarchical data structure of 5 levels (with time at the lowest level-1 as within-sujects factor) and would like to control for levels...

• Replies: 0
• Views: 1,237
03-05-2015, 02:33 AM
15. ### Would Chi square test of homogeneity be appropriate ?

Hi My respondents are a sample of 400 Teachers, out of which 290 are male 110 are female. I have used 5 point Likert's scale as 1 = strongly agree...

• Replies: 2
• Views: 1,496
03-05-2015, 12:00 AM
16. ### Help with statistics

Only statistics that you need to calculate for it are the means, standard deviations, and sample sizes. Here are the results: Nutrient ...

• Replies: 5
• Views: 2,036
03-04-2015, 11:36 PM
17. ### Which statistics program is this? (Panel VAR analysis)

I have been trying to find the program that authors of a couple of different studies used to show off impulse response functions of panel VARs. I am...

• Replies: 2
• Views: 1,222
03-04-2015, 01:35 PM
18. ### What kind of test?

Hi all I'm sorry to bother you with something you've probably seen a lot, but I'm doing an experiment for a module and I need some help on...

• Replies: 0
• Views: 1,159
03-04-2015, 08:53 AM
19. ### Help: Which test to use for comparing variability

Hi: I am wondering if I can ask a bit of help. I have patients undergoing two different procedures (binary factor). One of the outcomes is is...

• Replies: 2
• Views: 1,269
03-04-2015, 07:32 AM
20. ### combining a random, variable and its inverse

I am measuring two scientific entities, X and Y using empiric measurements. Each has its own mean and sample variance based on Nx and Ny sample...

• Replies: 2
• Views: 1,248
03-04-2015, 06:50 AM
21. ### Calculate increase amount of product sales?

Hello, My question is that; for example we have two products that different price and different sales volume. According to example below, we...

• Replies: 0
• Views: 1,463
03-04-2015, 03:26 AM
22. ### Calculating sample size

Hello, I am going to conduct a research and would like to estimate the sample size that I will need. Here is the information that I have, please...

• Replies: 3
• Views: 1,667
03-04-2015, 02:47 AM
23. ### Urgent help with statistical test please

Hi everyone. I am a novice at statistical tests, as such I need urgent help in determining what type of statistical test to use in hypothesis testing...

• Replies: 6
• Views: 1,754
03-03-2015, 05:26 PM
24. ### propagated error in formula with regression coefficient based on uncertain x data

Hello, I am working on a Masters thesis in mechanical/energy system engineering and after reading my statistics books and searching this forum and...

• Replies: 0
• Views: 1,124
03-03-2015, 05:21 PM
25. ### Time Series Analysis Threshold Value

I have time-series data for 0 min, 5 min, 10 min, etc. for 5000 genes. (Gene expression). I want to set a threshold value to eliminate reads that...

• Replies: 0
• Views: 1,046
03-03-2015, 12:57 AM
26. ### Percent Error with Limited Precision

Consider an experimental data point with limited precision, such as 1.5 ± 0.2. The actual value is 1.6. How would one report the percent error,...

• Replies: 0
• Views: 980
03-02-2015, 11:32 PM
27. ### how to calculate multiple related odds/chances

I am not sure if this is the right forum or not, if not please excuse me. This is not a homework question either, it is more of test strategy...

• Replies: 3
• Views: 2,339
mrx
03-02-2015, 11:18 PM
28. ### Recently, steps have been made to substantially improve the process.

Recently, steps have been made to substantially improve the process. A P chart has been plotted for some time. One would not be surprised to find...

• Replies: 0
• Views: 2,712
03-02-2015, 07:32 PM
29. ### Explaining different process variances

Hi everybody, The situation: I'm stuck with the following problem: some measurements are done on a number of batches. These measurements are assays...

• Replies: 0
• Views: 1,137
Bmi
03-02-2015, 05:41 PM
30. ### Benchmarking and Statistical Difference

Hey everyone, I have a few issues and would really appreciate your help :) Thank you very much ! So here it goes : I have two levels ( A...

• Replies: 3
• Views: 1,779
03-02-2015, 12:48 PM
31. ### For Process Capability, what is Null Hypothesis

1) That the ratio between the specs and the process spread should be one 2) That the ratio between the specs and the process spread should be larger...

• Replies: 2
• Views: 3,846
03-02-2015, 08:00 AM
32. ### help on what stats test to do on my data!!

Hi i have results for my dissertation on the type of resistance my bacteria have. for one sample (water), i have 40 non resistant colonies, 3...

• Replies: 5
• Views: 2,180
03-02-2015, 03:46 AM
33. ### Need help, Stats will probably be the death of me...

Hello everyone on the forum! I am by no means a mathematician, so how I ended up in Statistics II is beyond me. Unfortunately, I received a wonderful...

• Replies: 0
• Views: 1,212
02-28-2015, 08:01 PM

Hi! I need to test whether this set of scores is at an above chance level where 0 indicates a chance level? 0.58 0.42 0.33 -0.02 0.44 0.62

• Replies: 0
• Views: 1,332
02-28-2015, 07:40 PM
35. ### Transforming Negatively Skewed Independent Groups

I have two independent groups, (roughly 30 in each) – and their performance on 3 different tasks, there are 10 scores in total for each group. The...

• Replies: 0
• Views: 1,090
02-28-2015, 02:13 PM
36. ### Lognormal distribution - calculating the standard deviation from %iles

I have the mean and percentiles of a variable (flow) which I believe can be represented by a lognormal distrbution. How do I calculate the standard...

• Replies: 0
• Views: 893
02-27-2015, 07:12 AM
37. ### Need help for statistic Question

I an doing some statistic exercise, I got the wrong answer, but have no clue how to get the correct answer.(The question is at the following picture,...

• Replies: 2
• Views: 1,433
02-26-2015, 03:29 PM
38. ### Statistics II Excel Hangups

Hello all, I somehow find myself Statistics II. As a gen-ed student at a community college, this is the final math course required of me and what...

• Replies: 9
• Views: 1,323
02-26-2015, 02:21 PM
39. ### Distribution with Median=Mode=Mean?

Hello. Is there any important distribution with Median=Mode=Mean, apart from the Gaussian and Student's distribution?

• Replies: 1
• Views: 1,204
02-26-2015, 10:28 AM
40. ### power analysis- interpreting sample size given established literature

Hello and thank you for clicking, I am attempting to use relevant effects size from a published study to obtain a suggested sample size for my...

• Replies: 3
• Views: 1,222
02-25-2015, 05:25 PM
41. ### Parents Sue School - Hypothesis Testing and P-Values

Hi Guys, https://www.youtube.com/watch?v=jWqd76kmtV4&feature=youtu.be I would appreciate some input on what figures do I need crunch exactly...

• Replies: 3
• Views: 1,565
02-25-2015, 10:31 AM
42. ### Deviance for "neutral"

Hello, if I define a numerical scale from 1 to 9, where 1 is "very negative" and 9 is "very positive" and define 5 as the value for "neutral",...

• Replies: 11
• Views: 2,066
02-24-2015, 02:46 PM
43. ### how to analyse RCBD single factor with unequal variances

data is not showing normal distribution. I want make it group to the AIC value, but I can't. Please help me out to make the group and finding AiC...

• Replies: 0
• Views: 838
02-24-2015, 12:48 PM
44. ### Lack of correspondent Analysis

Hi, I am doing a research of plants. However, not sure what statistical method I should use. The response variable is the number of flowers for...

• Replies: 2
• Views: 1,202
02-24-2015, 09:40 AM
45. ### I have an actual and estimated time series to compare - linear regression ok?

I'm pretty new to this but trying to figure out which estimated time series does a better job of predicting what the actuals are. I have two...

• Replies: 0
• Views: 1,006
02-23-2015, 11:01 PM
46. ### Power analysis (gpower) - interactions

I'd like to conduct a power analysis in gpower to determine the total N required in a study, with the following requirements: power desired: 0.80...

• Replies: 0
• Views: 1,133
Nem
02-23-2015, 03:43 PM
47. ### Power analysis question

Hello. I have two distributions A and B. They're normally distributed, and are not significantly different (by t-test). From experimental design,...

• Replies: 4
• Views: 1,762
02-23-2015, 02:05 PM
48. ### General query about small uneven samples

My sample size is around 60 particpants (30 in each condition - controls vs patients). My participants are children and the tests I use depend on...

• Replies: 3
• Views: 1,027
02-23-2015, 10:27 AM
49. ### Samples and Sampling Distribution

Inferential statistics are based on the Law of Large Numbers (LLN), the Central Limit Theorem (CLT), and sampling distributions. How does a sample...

• Replies: 2
• Views: 1,400
02-23-2015, 09:05 AM
50. ### Need help - Equal/Unequal Variance

Hi, In performing T-Test on mean water temperature with 2 samples, how do I justify the use of equal or unequal variance? In practical, all...

• Replies: 2
• Views: 1,871
02-23-2015, 07:25 AM
51. ### Average Percent Change

When finding the average percent change of different data points in time, should I average the points together first and then find the percent change...

• Replies: 1
• Views: 1,315
02-22-2015, 09:24 PM
52. ### Test on Two Mean Vectors

Hello. I am currently taking a multivariate statistics course and having trouble with this problem. Test Ho: μ' =(6,11) ....... 3 ...

• Replies: 2
• Views: 1,826
02-22-2015, 04:57 PM
53. ### Stata Help Wanted

Hello, Can someone offer some help with Stata. I need to know the following. 1) which are independent and which are dependent variables. 2) ...

• Replies: 5
• Views: 1,854
02-22-2015, 04:53 AM
54. ### How do I find standard deviation without a sample size ?

I have been working on a problem with the help of a friend who is pretty knowledgeable on the subject. I don't think this is possible to find a...

• Replies: 2
• Views: 4,188
02-21-2015, 10:44 AM
55. ### homoscedasticity assumption in linear regression

If we have a usual linear regression model Y = beta0 + beta1*X + e If we say that e is independent of X, does this automatically imply that var(e)...

• Replies: 3
• Views: 1,310
02-20-2015, 06:23 PM
56. ### Problem using CSLOGISTIC command in SPSS

I moved this to the SPSS section, for three reasons. (1) SPSS section more appropriate, (2) I got many views here, but not suggestions, (3) I had an...

• Replies: 0
• Views: 1,020
tdf
02-20-2015, 02:37 PM

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