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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: 196,557
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: 66,616
09-30-2005, 09:44 AM
1. ### Help!!!

Can you see if I am correct? Identify each of the random variables described below as discrete or continuous The ounces of fountain drink...

• Replies: 13
• Views: 4,167
10-21-2010, 05:56 PM
2. ### help with the confidence

can anyone please explain the confidence interval process. such as how to find it and how to solve using it

• Replies: 13
• Views: 3,547
12-15-2010, 09:11 PM
3. ### too many females in sample

I have a problem I have 148 females and 48 males. What do I do? I have looked it up everywhere and can not figure it out.

• Replies: 13
• Views: 3,445
03-16-2011, 09:05 PM
4. ### Logistic Regression Help Needed

....................

• Replies: 13
• Views: 3,745
11-16-2011, 12:26 PM
5. ### What sort of data is this? In a pickle

Hi, sorry first of all if is could be suited more towards a different catagory. Basically ive done questionaire and one question is : 3....

• Replies: 13
• Views: 2,792
11-10-2011, 06:50 PM
6. ### Interpret Chi-Square Goodness-of-Fit Test?

Hi and thank you for reading this post, I ran a factor analysis on a scale and its data, and it came with a "Chi-Square goodness-of-fit" output...

• Replies: 13
• Views: 20,655
11-18-2011, 03:45 PM
7. ### Can Confidence Interval have zero width?

Is it possible for Confidence Interval to have zero width? If yes, how would you interpret?

• Replies: 13
• Views: 4,094
11-20-2011, 03:17 PM
8. ### no idea where to even start this homework problem HELP!!!!

The variables x and y in the data below are related by a linear relationship. a) Assuming that the standard deviation σi for data point n yi is...

• Replies: 13
• Views: 2,090
BGM
12-09-2011, 03:05 AM
9. ### Beer

Hi, I am preparing for a test and I need help in this question: Tree # of Individuals # of Trees S.D. of Diameter Oak ...

• Replies: 13
• Views: 2,848
01-20-2012, 12:09 PM
10. ### Japanese Beetle Larvae

I currently have no idea how to complete this question, which is why I came here asking for some help/hints on how I could do this. How I could start...

• Replies: 13
• Views: 3,036
02-15-2012, 07:12 PM
11. ### How would you find the folllowing

The question is..... Find the following four distances to test how close the data set is to the Empirical Rule If the mean is 21.51 and the S....

• Replies: 13
• Views: 3,038
02-29-2012, 12:00 PM
12. ### Normality assumptions questions

I have a dataset in which I am trying to compare numbers of birds responding to 3 treatments (actually a little more complicated, but for simplicity,...

• Replies: 13
• Views: 2,989
08-08-2012, 03:11 PM
13. ### Statistical test for questionnaire results

Hello, I'm trying to establish a relationship between people having Deaf friends/family and their understanding of the problems Deaf children can...

• Replies: 13
• Views: 5,462
08-24-2012, 06:56 PM
14. ### moderator vs. mediator variable

I've encountered these terms 100s of times and looked up their definition and tried to understand them at least 15 times. I'm really trying to get...

• Replies: 13
• Views: 36,895
09-06-2012, 11:12 AM
15. ### Simple simulation problem!

Hi, I have a problem that will probably be very simple for the experts on this forum. I don't have any statistical background, so this is a bit too...

• Replies: 13
• Views: 1,775
09-12-2012, 09:57 AM
16. ### Help writing what I'm doing mathematically

I am not a mathematician and thus need major help representing my actions mathematically. First I'll explain what I'm doing and then a crack at...

• Replies: 13
• Views: 2,623
10-07-2012, 10:25 PM
17. ### ANOVA or Kruskal Wallis

Dear Stats experts here... I have a question: I am counting cells in histology slides of certain timepoints after a treatment. day 0, day...

• Replies: 13
• Views: 4,337
10-24-2012, 11:09 PM
18. ### Need help in Thesis Proposal (Correlational Study) NEED HELP ASAP!

So my central question is this: Is there a correlation in positive emotional output between winning and losing among young-adult to middle-aged NBA...

• Replies: 13
• Views: 1,925
11-29-2012, 01:01 PM
19. ### Distributions

I realise this is going to annoy some of you for its simplicity, but when I was "interviewed" I said I wanted to understand more about distributions....

• Replies: 13
• Views: 2,451
03-09-2013, 11:38 PM
20. ### Absolutely lost!

Hi everyone, I am trying to figure out how to solve the following problem and can't, for the life of me, understand which test I should use. My...

• Replies: 13
• Views: 1,965
01-19-2013, 07:32 PM
21. ### Should i use ancova or anova? One continuous variable and one categorical variable.

I have one dependent variable that is continuous. It is the score on a particular achievement test. I have two independent variables. One categorical...

• Replies: 13
• Views: 9,236
03-27-2013, 09:29 AM
22. ### Expected Value and Variance of Empirical distribution function

Hey guys, So Ive been looking everyone for a proof of the following E(\hat{F_{n}}(x))=F(x) and Var(\hat{F_{n}}(x))=(F(x)-(1-F(x)))/n I know that...

• Replies: 13
• Views: 6,478
01-27-2013, 09:19 PM
23. ### Coin tossing simulation in R

I need help with this problem: Toss a fair coin until a head shows up, estimate the expectation of the number of tosses required by simulation....

• Replies: 13
• Views: 5,185
08-24-2013, 10:04 AM
24. ### I really need help interpreting this study?

Hello, I'm actually trying to write a sociology paper on race, but I have no idea how to interpret this study:...

• Replies: 13
• Views: 1,715
07-27-2014, 01:02 PM
25. ### help finding the proportion ?

• Replies: 13
• Views: 2,140
08-09-2014, 10:55 PM
26. ### What type of distribution is?

Usually results of direct measurements are normally distrubuted. Also, if we make linear transformation on result. e.g. if X it is a normally...

• Replies: 13
• Views: 2,162
08-27-2014, 10:31 AM
27. ### Using a Correlation Matrix with no data in SPSS

I have a correlation matrix with the correlations between each set of five independent variables and the correlation between each IV and the DV. I...

• Replies: 13
• Views: 3,370
09-22-2014, 04:07 PM
28. ### Data analysis with a GEE, is my method valid?

Hi everyone, I’ve been doing some statistical analyses in R on some data. It’s for use in a manuscript I’m hoping to get published in a biological...

• Replies: 13
• Views: 4,973
10-07-2014, 10:01 PM
29. ### calculating probability of disease according to age

I'm making a program which, at one point, is supposed to estimate the probability of having a certain disease based on the patient's age. I'm going...

• Replies: 13
• Views: 3,117
10-24-2014, 02:27 PM
30. ### Additive effect, how to calculate?

Dear users, I hope you have some good ideas about the following Medical dilemma. I'm conducting a study about Three drugs, A + B + C. Drug A...

• Replies: 13
• Views: 4,335
11-19-2014, 04:04 PM

Hi, I'm a bioscience student - stats are not my strength - and I'm trying to analyze some data on R (which I am using for the first time) and I'd...

• Replies: 13
• Views: 2,109
02-15-2015, 12:51 PM
32. ### choosing the right statistical test for comparing data, when do you use which test

Hello all, I would like some feedback on the right approach of analysing data, comparing means of groups of data. Currently I work with the...

• Replies: 13
• Views: 1,986
04-22-2015, 03:31 AM
33. ### Regression analysis with non-integer event rates

I am working as part of a team on a relatively large dataset which has been subject to imputation analysis. One of my colleagues has pointed out...

• Replies: 13
• Views: 2,232
07-13-2015, 03:12 PM
34. ### [Prism 5] Gather or Individual Analysis? ANOVA or Kruskal?

To whom it may help: My research is on cellular/molecular responses after hormones farmacological administration and I'm not quite sure how to...

• Replies: 13
• Views: 2,188
08-28-2015, 08:49 AM
35. ### Some non-linear regression equations

Hello , I have 4 predictor variables X1,X2,X3,X4 and one response variable Y . I need some non-linear regression equations for these...

• Replies: 13
• Views: 2,837
10-25-2015, 10:27 AM
36. ### What kind of test for...

Hi guys, i have multiple biological parameters in multiple patients during a period of two years and when to check for correlation or relation ...

• Replies: 13
• Views: 352
09-06-2017, 03:09 PM
37. ### Help to choose appropriate statistics for research

I am working on my first research project. I am really junior in this matter. My research aims to explore factors associated with change of financial...

• Replies: 12
• Views: 4,180
08-03-2007, 05:45 AM
38. ### Laplace distribution

Hi all. I have a query regarding the Laplace (double exponential) distribution. I have conducted some experiments measuring the orientation of...

• Replies: 12
• Views: 4,604
04-21-2008, 08:23 AM
39. ### Joint PDF Integration

The joint pdf is f(x,y) = e^(-y) , 0<=x<=y I want to find the expected value of XY, so E(XY) = DoubleIntegral What are the boundaries for...

• Replies: 12
• Views: 4,386
07-16-2008, 12:06 PM
40. ### Standard deviation and sample size

Hi. I have no background on statistics, so please just go down to fundamental for me. But here are some basic questions about statistics and standard...

• Replies: 12
• Views: 4,100
12-16-2014, 05:52 AM
41. ### CDF of average

Hi all, I hope that someone can help me with this! I have a list of values as below: 82.1134 84.5516 91.1851 65.6035 69.971 92.4706 79.1505...

• Replies: 12
• Views: 2,979
01-14-2015, 04:34 PM
42. ### Bayesian inference, Bayes estimator

Let X a single observation of distribution U~, where \theta is a random variable with density \pi(\theta)=\theta e^{-\theta},\theta >0 a)find a...

• Replies: 12
• Views: 3,215
03-31-2015, 05:02 PM
43. ### Multiple regression: Why does a new control variable make an old one insignificant?

Okay guys, I've tried Googling this, but I couldn't really find any good results. I've made a regression analysis of attitudes towards gender...

• Replies: 12
• Views: 2,975
04-27-2015, 05:33 PM
44. ### Negative confidence intervals in regression

Hi all, So I'm really stumped. Basically I have a negative standardised coefficient value of -0.35, and a 95% CI equals (-0.47, -0.23). I'm having...

• Replies: 12
• Views: 3,780
05-03-2015, 10:20 PM
45. ### Introduction and question

Greetings All, My name is Glen. I'm an industrial mechanic in southern Washington. I have been reviewing graphs of data collected from a compressed...

• Replies: 12
• Views: 3,247
10-29-2015, 04:57 PM
46. ### Why is log transformation valid?

got my question answered thank you

• Replies: 12
• Views: 2,937
11-21-2015, 03:06 PM
47. ### Finding the p value

I am taking a statistics class, and i have some problems Understanding a formula. The formula in question is like this: ...

• Replies: 12
• Views: 1,907
11-10-2016, 12:30 PM
48. ### Confidence interval: true or false?

We have measured the concentration cesium-137 in the tissue of 15 tunafish. We may consider the distribution as normal distribution and a 95 %...

• Replies: 12
• Views: 2,165
02-19-2017, 04:10 PM

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