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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: 197,355
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: 67,076
09-30-2005, 09:44 AM
1. ### Statistics project: hypothesis testing

For the most part i understand the concept but i am not sure what kind of test to use as my teacher only shows us how to do things in the calculator...

• Replies: 11
• Views: 7,057
07-13-2009, 06:54 PM
2. ### N vs N-1 in variance of population?

I did not get the why there are N and N-1 while calculating population variance. When we use N and when we use N-1?

• Replies: 11
• Views: 6,345
BGM
11-03-2011, 03:09 PM
3. ### More determining sample size

Hoping for some help and advice from statistical gurus.... Please forgive that this question has probably been asked a multitude of times...

• Replies: 11
• Views: 5,515
10-22-2009, 07:29 AM
4. ### What does the forumla Σ(x-xbar)/((n-1)v^(3/2)) calculate?

What does the following formula calculate? Thanks

• Replies: 11
• Views: 240,655
11-15-2009, 03:25 PM
5. ### variance estimation question

Hi all. I am facing a problem to estimate the variance of a random variable. The difficult part is I am given a subset of the sample at one time. and...

• Replies: 11
• Views: 4,572
04-13-2010, 07:27 PM
6. ### confidence interval vs hypothesis testing

Hi guys, I have a little question, theoretical question. I read in a book that if I want to calculate a confidence interval for the mean, then I use...

• Replies: 11
• Views: 6,496
06-15-2010, 04:27 PM
7. ### t- and F- values of correlation efficients

What are the data sets that are used in finding t-value and F-value of correlation coefficients? If the correlation coefficient for X data set and Y...

• Replies: 11
• Views: 9,045
08-13-2010, 11:55 AM
8. ### Odds Ratio (with interactions in Logistics Regression)

the following shows my logistics regression fitted model with interactions: p = 1/ (1+exp {-0.377 + 0.0933*x1 - 0.463*X2 + 0.0259*X3 +...

• Replies: 11
• Views: 11,883
08-16-2010, 11:09 AM
9. ### Missing values

On the basis of the partially completed contingency table below, select all the true statements from the following list: (note that the given...

• Replies: 11
• Views: 7,071
09-05-2010, 04:08 PM
10. ### Central areas

I'm so stuck on this question, its really starting to do my head in. I've listened to my recorded lectures on this topic about 8 times and gone over...

• Replies: 11
• Views: 2,853
09-10-2010, 09:27 PM
11. ### Re:F-test for effect of two independent variable

Anyone know how do we use a F-test to see if the impact of two independent variable are the same? e.g the impact of gender and the impact of race...

• Replies: 11
• Views: 7,402
09-14-2010, 10:25 PM
12. ### Need Help with statistic question

A computer password must contain exactly 6 symbols. You can use the letters (case sensitive), 10 digits, and the characters ! @ # \$ %. Find...

• Replies: 11
• Views: 5,224
10-12-2010, 01:11 PM
13. ### Error in parabolic regression of data points

I have some data points, each with a specific (but different) error (standard deviation). I fit a parabolic curve to the data points using least...

• Replies: 11
• Views: 8,696
11-03-2010, 10:57 PM
14. ### [HELP Self-learning] When use Z distribution and When T?

I really think Stats is not for dump gal like me... Finally I get some questions to test my understanding. Can some gurus see if I applied Z / T...

• Replies: 11
• Views: 3,871
11-04-2010, 07:30 PM
15. ### Difficulty understanding correlation results

Good afternoon, I did a small study of 4 children (I couldn't find more subjects which met my independent variables in the time I had :/) and gave...

• Replies: 11
• Views: 3,959
12-05-2010, 08:56 PM
16. ### Help with Pearson Correlation - PLEASE

I am still struggling with submitting my Thesis and Supervisor issues. I would appreciate some advice please. I have a sample size of 1089...

• Replies: 11
• Views: 13,817
12-12-2010, 01:59 AM
17. ### Significance Test for Comparing two Proportions

I need some help comparing two proportions. I am currently doing research on the inhibiton of a particular phenotype by various chemicals. The...

• Replies: 11
• Views: 7,067
12-18-2010, 10:54 PM
18. ### How can I analyze data that is yes/no (I have it as 1/0)

-Hi, I have a 2x2 factorial ANOVA design. It has several variables measured, but the only one I can't figure out is the one for specimen movement. ...

• Replies: 11
• Views: 22,857
01-16-2011, 06:06 AM
19. ### Stats work: Distribution for a random variable

Hey everybody, I've got a little statistics question that I'd really appreciate some help with. While carrying out a survey on the question "do...

• Replies: 11
• Views: 3,453
03-22-2011, 05:26 PM
20. ### correlation of 3 variables

X is negative correlate with Y, and X is negative correlate with Z, the question is: is it possible that Y is negative correlate with Z? Give an...

• Replies: 11
• Views: 2,859
02-06-2013, 08:45 PM
21. ### interpreting SEM

Hi, Was having a slight issue. while interpreting my SEM model results ...could you tell me how do i get 1.the beta coefficient and its...

• Replies: 11
• Views: 5,903
08-23-2011, 10:59 PM
22. ### I am stuck in this normal distribution statistics problem... please help...

On an examination the average grade was 74 and the standard deviation was 7. If 12% of the class are given A's and the grades curved to follow a...

• Replies: 11
• Views: 3,177
09-07-2011, 12:39 PM
23. ### poisson processes help

Hi, i'm stuck on a basic poisson process question. If Xt (where t is a subscript) is a poisson process with intensity lambda what is the conditional...

• Replies: 11
• Views: 5,066
10-19-2011, 12:03 PM
24. ### Statistical test for animal arrival times

What statistical test should I use for comparing arrival times at a location? I'm comparing two different search strategies.

• Replies: 11
• Views: 2,911
11-18-2011, 11:29 AM
25. ### Type I/ Type II Errors

Let X follow a Binomial distribution (5, theta) and consider the hypothesis H(0):theta<= 1/2 vs H(1): theta>1/2 Test A rejects the null...

• Replies: 11
• Views: 3,691
11-28-2011, 02:58 PM
26. ### relationship between category and dependent variables

HI, I conducted a study on participants performance when using DEvice 1 or 2 (between subjects). Before that, they completed a learning style...

• Replies: 11
• Views: 1,543
01-21-2012, 06:05 PM
27. ### More than two values for a dummy variable (regression)?

How do I deal with the case where I am dealing with more than two values for a dummy variable when doing regression? I know that if there are 2...

• Replies: 11
• Views: 17,165
01-31-2012, 02:16 PM
28. ### Statistical Preference - How to choose between two options with limited data?

Assume I have two sets of samples and need to choose which is 'better' in a game theory sense. Of course I can just compare mean vs. mean but.. ...

• Replies: 11
• Views: 4,092
02-14-2012, 04:12 PM
29. ### Maximum Likelihood Estimator for alpha in Gamma Distribution

I got the first part of the question asking for the MLE for Beta. But I realized that MLE for alpha cannot be mathematically derived. I know that we...

• Replies: 11
• Views: 8,196
02-10-2012, 02:17 AM
30. ### At what value of correlation can I say two values are correlated? (academic ref)

So I'm doing some regression tests but before I do the regression tests I am performing correlation analysis and removing variables that are very...

• Replies: 11
• Views: 3,692
02-20-2012, 07:46 AM
31. ### Traffic Problem

Well they went and did it! They installed a stop sign on our road because a the folks on a small Feeder road were worried about safely entering the...

• Replies: 11
• Views: 2,558
03-20-2012, 11:56 PM
32. ### Do minimum/maximum ends of the range of IV affect the turning point location?

Hi all Is turning point independent of the minimum and maximum points of the curve? or if we extend the minimum end to lower thresholds, there...

• Replies: 11
• Views: 4,944
05-10-2012, 07:00 PM
33. ### One level of dichtomous variable missing when mutlivariable analysis conducted

Hello, I would appreciate any help on this. I am running a mixed model procedure as part of my mutlivariable analysis. My dependent variable...

• Replies: 11
• Views: 2,376
08-09-2012, 06:40 AM
34. ### Which test to use - correlation or differencies in biology?

Hello! First question here, hope someone of you can give me a helping hand. Me and a friend have performed a basic study on peregrine...

• Replies: 11
• Views: 2,423
08-15-2012, 01:57 PM
35. ### How to treat multiple responses to a single response survey question

Hello all, My department is running a longitudinal study, where surveys are filled out by participants at various time points. The participant...

• Replies: 11
• Views: 4,333
08-15-2012, 03:12 PM
36. ### Appropriate to use time as covariable in ANCOVA?

Hello stats people, I need to assess whether the rate of increase (in soil carbon) differs significantly between two groups (forests). I believe...

• Replies: 11
• Views: 2,925
09-30-2012, 10:50 PM
37. ### Kruskal Wallis and Mood's median

Would appreciate some perspective on the following: Is the Mood's median test now rarely used? I am comparing right-skewed distributions (3...

• Replies: 11
• Views: 6,444
12-03-2012, 03:04 AM
38. ### Who is more likely to win (mean score + standard deviation)

My teacher gave this as an example: "Scotland is going to play vs Tonga in rugby. Tonga has a mean score of 18 and a standard deviation of 13....

• Replies: 11
• Views: 2,753
10-18-2012, 02:09 PM
39. ### Hypothesis Testing Question Help

I've been lurking for some time now, soaking up knowledge, but now I'm stuck on finding p-values for the following question. Q: A board game...

• Replies: 11
• Views: 2,886
11-20-2012, 04:37 PM
40. ### Help needed with cotton experiment

Hello all! First time visitor/poster. . . I am needing your help with determining the statistical significance of a cotton variety trial that I...

• Replies: 11
• Views: 1,549
12-06-2012, 02:20 AM
41. ### Testing for similarity vs dissimilarity

Hi all, I'm a grad student who uses stats a lot but who has very little formal training. Not sure if this is in the right forum, so feel free to...

• Replies: 11
• Views: 3,386
11-21-2012, 08:37 AM
42. ### 15 Likert scale questions: How do I find the mean, median and mode?

Please Help! I need to find the mean the median and the mode and also use a t test to interpret my results between females and males in mate...

• Replies: 11
• Views: 14,529
12-18-2012, 03:03 AM
43. ### Regression Question

Hey guys, stuck on a homework question, help please! Country/per capita expenditure/% of Health costs paid by private insurance Japan/2662/0.4...

• Replies: 11
• Views: 1,769
04-18-2013, 01:18 AM
44. ### Best way to determine if replication helped

I am trying to figure out a way to help show me that having two reps in an experiment is better than one rep. I remember doing a blocking efficiency...

• Replies: 11
• Views: 1,780
02-12-2013, 08:35 PM
45. ### How to Calculate p-value of Grade Averages

I have average test scores for two populations: male and female. The average score for females is 92. The average score for males is 89. Given...

• Replies: 11
• Views: 5,255
07-05-2013, 03:05 PM
46. ### Sufficient Statistic for θ

Hey guys, So Im looking for a sufficient statistic for θ for U(θ, θ+1) Here's what I was thinking. T(X^n)=(min X_{i},max X_{i}) since the pdf is...

• Replies: 11
• Views: 42,253
02-12-2013, 04:48 PM
47. ### Consistent MLE of a U(0, θ)

So the question is: Let X1,.., Xn ∼ U(0, θ). Show that the MLE is consistent. Hint: Let Y=max {X1,... ,Xn}, for any c, P(Y <c)=P(X1 <c,X2...

• Replies: 11
• Views: 58,521
02-09-2013, 09:14 PM
48. ### T-test

I'm carrying out a t-test 'by hand' in R. H0: mean = 0, H1: mean != 0. Sample is 9, 10, 11, 10, 10. Sample mean is 10, with standard...

• Replies: 11
• Views: 2,123
05-04-2013, 09:19 PM
49. ### A causes B - B causes C - Does A cause C?

Hi all! I have a simple problem with my two hypotheses: H1: Industry dynamic (A) positively influences competence (B). H2: Competence (B)...

• Replies: 11
• Views: 4,728
07-19-2013, 06:28 PM
50. ### Discrepancy between paired t-test and independent t-test results

Hi, I'm analysing pre- and post- data collected from two groups. Group 1 consists of 18 members who received treatment. Group 2 consists of...

• Replies: 11
• Views: 3,587
08-05-2013, 11:15 AM
51. ### One-way ANOVA or two-way ANOVA?

Supposed we gave 100 males and 100 females protein supplement for 3 months. We measured the muscle thickness of the participants before and after the...

• Replies: 11
• Views: 2,520
08-20-2013, 08:11 AM

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