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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: 197,299
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: 67,050
09-30-2005, 09:44 AM
1. ### Fisher's Exact Test

Hello,:wave: I'm currently a doctoral candidate in wildlife ecology. I'm analyzing habitat selection data for bullsnakes collected over three...

• Replies: 8
• Views: 8,618
03-26-2014, 07:32 AM
2. ### Difference between standard deviation and standard error

Hi, what exactly is the difference between the SD and SE? I read through the wikipedia article but dont really understand the difference. Can...

• Replies: 8
• Views: 177,465
09-03-2014, 11:48 AM
3. ### What method to use?

Hello everyone, would like to know the following. My data is non-parametric, I have collected number of people who will show up for a diagnostic...

• Replies: 8
• Views: 2,000
02-18-2014, 02:11 PM
4. ### Standard Deviation and Time Series Analysis

Hey I was wondering if it's best practice to use standard deviations (specifically the 3-sigma rule) as a benchmark in time series analysis? I'm...

• Replies: 8
• Views: 6,281
02-21-2014, 11:41 AM
5. ### Survival analysis with only 2 days of survival data?

Dear all, I screend the survival of my insects after bacterial infection on day 1 and day 10 after exposure. Would it be ok to use a survival...

• Replies: 8
• Views: 1,789
03-06-2014, 03:31 AM
6. ### t-test for independent samples question

Hello all, I'm looking for a little help with a research problem I'm working on. Without getting into the nitty-gritty of the details (which I can...

• Replies: 8
• Views: 1,767
03-22-2014, 01:29 AM

Hiya, I have been trying for ages to get my head around this and i am still so unclear. I am looking at a set of 20 local gyms and seeing out...

• Replies: 8
• Views: 1,597
03-19-2014, 03:51 PM
8. ### Multiple Linear Regression - really need help

Hi, I'm going out of my mind...really need help. I have one continuous dependent variable (test scores) and 6 categorical (with 2 categories -...

• Replies: 8
• Views: 2,352
04-08-2014, 11:01 PM
9. ### Senior project statistics

Hello all, I am currently working on a senior project for a soil science degree and had some questions about my project statistics. My group is...

• Replies: 8
• Views: 2,133
04-18-2014, 09:11 PM
10. ### Using bootstrap to calculate the sample size for a median ?

hi, I have a small(ish) sample of 31 data points from a highly right skewed distribution and need to determine the sample size to estimate the...

• Replies: 8
• Views: 2,372
04-28-2014, 01:29 AM
11. ### Likelihood Ratio test

I have a pdf where I would like to test for the following hypothesis: H0: θ1=θ1,0; Ha: θ1>θ1,0, and f(x) =(1/θ1) exp((-x-θ2)/θ1), if x>θ2, and 0...

• Replies: 8
• Views: 1,863
04-27-2014, 10:51 AM
12. ### Quantitative or Qualitative??

What type of sampling method is used for driving around and finding gas prices? Also would that be considered quantitative data?

• Replies: 8
• Views: 4,604
05-06-2014, 06:08 PM
13. ### chi-square and multiple testing

Hi, I want to compare survey responses for a particular survey questions between one year and the next - to see if there is a statistically...

• Replies: 8
• Views: 1,970
05-23-2014, 02:42 PM
14. ### Statistics to manage doctors' appointments more reliably?

Hello Yesterday, I went to an appointment with an ophthalmologist at a big health care center. I wasn't the first patient, but people go there...

• Replies: 8
• Views: 1,894
07-18-2014, 09:03 AM
15. ### Correlation coefficients in subsample and whole sample

Hi, I know that this might sound to be an easy and basic statistic concept, but I'm really beginner in this field. This is the thing. I have two...

• Replies: 8
• Views: 3,885
08-05-2014, 08:53 PM
16. ### To pool or not to pool?

Hi there, Stuck with my current analysis, let me set the scene: I have 6 subjects, three are in "group A" and three are in "group B". From each...

• Replies: 8
• Views: 1,738
08-10-2014, 12:51 PM
17. ### How do you define a statistical way to ensure that the worst case are captured??

I need a recommendation which addresses the variability of results. There is variability associated with these results. What I specifically need...

• Replies: 8
• Views: 1,920
08-12-2014, 10:28 AM
18. ### appropriate multiple comparison test following several chi square

Dear all, I have the following problem: there are three groups of people in my analysis and I have 17 domains that are basically questions (yes or...

• Replies: 8
• Views: 1,676
09-01-2014, 04:12 PM
19. ### Weights for weighted mean: Do these weights make sense?

I'm attempting to weight a mean to make outliers less impactful. I know people use a median here often but am looking to try to make a mean that's...

• Replies: 8
• Views: 2,161
09-04-2014, 12:58 PM
20. ### Inverse of the Standard Normal Cumulative Distribution Calculation

Hi Everyone, I'm trying to verify the calculation for the Inverse Cumulative Standard Normal Distribution Function represented by the Excel...

• Replies: 8
• Views: 7,704
10-02-2014, 10:39 AM
21. ### Finding two unknown Z's...

Hi! I have two problems in which I have to find the unknown Z or X... I've really done well with this section but somehow I just can't remember how...

• Replies: 8
• Views: 2,321
10-03-2014, 07:58 PM
22. ### Demonstration of statistical indipendence in a two way table

Hello at all guys There is someone which is able to demonstrate why , withi statistical indipendence, the conjoint frequency is the same of the...

• Replies: 8
• Views: 2,429
10-12-2014, 08:45 AM
23. ### Simultaneous Hypothesis Tests

Hi, this is my first post here, so I hope this is the right place to write it. I was wondering how can I test these hypothesis simultaneously: ...

• Replies: 7
• Views: 3,982
11-18-2005, 07:49 PM
24. ### help

I am having trouble with the folowing question: Use the Poisson Distribution to find the indicated probability. A computer salesman averages...

• Replies: 7
• Views: 4,694
12-09-2005, 04:03 PM
25. ### 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: 7,359
05-10-2006, 11:24 AM
26. ### Isolating an effect for a distribution

Hello stats gurus, I'm working on a project that has been perplexing me for a bit... I have 24 histograms (one for each hour of the day). ...

• Replies: 7
• Views: 3,246
03-10-2006, 09:11 AM
27. ### z score to find ranges

I am tyring to find the range of salaries earned by the bottom 20% of a group of female educators with the following data: Mean-43.195...

• Replies: 7
• Views: 4,277
03-29-2006, 07:40 PM
28. ### Fischer Table?

Hello all! I am currently working on a paper in finance. I have lost my statistics book. I would like to have a website with a Fischer table or...

• Replies: 7
• Views: 2,866
05-04-2006, 12:10 PM
29. ### Help with simple Confidence Interval Q

I just don't understand how to do these, I'm sure they are pretty simple. Any help would be greatly appreciated. A random sample of 120 passengers...

• Replies: 7
• Views: 2,332
05-04-2006, 01:24 PM
30. ### Joint CDF's and pdf problem

I am trying to solve part of a question whicg goes as: Q: Suppose X and Y are two continuous random variables whose joint density function is ...

• Replies: 7
• Views: 8,385
09-02-2006, 12:18 PM
31. ### Hi research student needs urgent help with simple problem

Hi am writing my honours dissertation for sociology and need desperate help calculating a simple problem. Still, I don't even know if it can be done....

• Replies: 7
• Views: 3,112
09-08-2006, 10:12 PM
32. ### power analysis

i'm helping out with the power analysis for a study that is using 6 independent variables and one dependent variable. orginially, i suggested a...

• Replies: 7
• Views: 3,918
09-29-2006, 11:10 AM

who can help me in this questions the data below is the number of hours of homework done as reported by 24 high school juniors for the last week in...

• Replies: 7
• Views: 5,900
08-30-2007, 11:24 PM
34. ### Hypothesis Test concerning difference in proportion- Where did i go wrong???

Hey all, The answer I get is not amoung the answers offered. I'd appreciate some help in telling me where I went wrong!! In order to determine...

• Replies: 7
• Views: 10,649
12-18-2007, 04:35 PM
35. ### Reverse Psychology

I have a rather unique problem. All the hypotheses I've come across in psychology statistics test for a significant difference between two or more...

• Replies: 7
• Views: 5,488
02-21-2008, 09:43 AM
36. ### Spearman Coef

I have a quick question for the board. I have 2 data sources that i decile ranked. I wanted to calculate a spearman coefficient for this data set...

• Replies: 7
• Views: 4,269
03-21-2008, 05:11 PM
37. ### Questions about Tukey's HSD/Scheffe Test

I heard Tukey Test can be used for unequal sample sizes. My assumption is that you must use some kind of weighted average of n for all groups....

• Replies: 7
• Views: 30,314
05-12-2008, 06:14 PM
38. ### multiple criteria

Hi all, I am dilettanet in statistics :o But I need to analyze some lab data. I am wondering if there is a method for comparing multiple criteria...

• Replies: 7
• Views: 2,432
06-30-2008, 12:17 PM

:wave: Hello I really hope you guys here can help me!! I am at a loss :confused: I am R-Newbie and my statistics knowledge is not very good,...

• Replies: 7
• Views: 5,733
08-18-2008, 08:04 AM
40. ### 2 IV's & Several DV's

Hi I have 2 distinct groups, smokers and nonsmokers. I'm comparing their behavoural flexibilty, cognitve flexibility and habitual behaviour. ...

• Replies: 7
• Views: 3,829
08-08-2008, 11:44 AM
41. ### Hypothesis testing

Test the hypothesis that the average age of the students in the following group is 35. Student # Age 1 37 2 ...

• Replies: 7
• Views: 3,999
08-22-2008, 04:36 AM
42. ### Confidence Interval

Hi, I wrote a program to keep track of the mean of some data. I didn't save the data but I have a time series of mean a_n of the data d_n ...

• Replies: 7
• Views: 3,212
08-27-2008, 09:23 AM
43. ### Which test do I use

Hello, I am hoping someone can please advise me on which stats test is most appropriate. I have a quantitative survey. It was sent out to...

• Replies: 7
• Views: 2,468
08-30-2008, 09:15 PM
44. ### Probability of a Type II error

I can't seem to figure out how to obtain the probability of type 2 errors from this question. A researcher is conducting a hypothesis test to...

• Replies: 7
• Views: 56,411
09-22-2008, 06:11 PM
45. ### Skew Normal Parameters

I am trying to find a way to calculate the location, scale, and shape of some data that appears to fit a skew normal distribution. I have found...

• Replies: 7
• Views: 6,980
09-23-2008, 01:48 AM
46. ### LMM for within and between subjects

I am a biologist wishing to examine sources of individual and temporal variation in stress in a primate population. We obtain our samples quite...

• Replies: 7
• Views: 5,080
10-21-2008, 04:09 PM
47. ### Mean Squared Error etc etc

Hi guys, i've some troubles with this problem. I solved point a) but i can't understand well point b) and c). Any hints? Thanx. a) In an...

• Replies: 7
• Views: 4,098
10-27-2008, 01:05 PM
48. ### Sampling Distribution

I've been doing a lot of homework questions on sampling distribution. For example, one question is to find the probability of having a sample mean...

• Replies: 7
• Views: 3,353
11-01-2008, 07:16 PM
49. ### re: zero in confidence interval but p-value < alpha

Hello. I would be very much appreciative of any help in this issue. The problem involves the difference of means of 2 dependent samples. The null...

• Replies: 7
• Views: 9,956
11-14-2008, 07:27 PM
50. ### non-parametric two way ANOVA

Hello, I'm so glad i found this site! I am wondering whether anyone knows of what non-parametric test i could use as equivalent to a two way...

• Replies: 7
• Views: 25,061
11-21-2008, 11:41 AM
51. ### When to use separate ANOVAs

Greetings, I've been struggling with trying to determine when to use several different ANOVAs or when to use one large ANOVA. Many of the projects...

• Replies: 7
• Views: 7,604
12-17-2008, 05:52 PM
52. ### Paired t on large data set

This is my first of hopefully many posts. Statistics is not one of my strong points :) I have a question. Below is the output from a paired t-test...

• Replies: 7
• Views: 5,372
12-31-2008, 11:31 AM
53. ### Help with study design

Hi I am kind of stuck with this study design: I want to compare the expression of 84 genes across 3 groups (1 control and 2 study groups) how many...

• Replies: 7
• Views: 4,965
12-28-2008, 08:40 PM

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