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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: 196,951
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: 66,855
09-30-2005, 09:44 AM
1. ### Normal Distribution Overlap

Is there a way that I can calculate the probability that a data point would fall in the region where two normal distributions with different means...

• Replies: 17
• Views: 28,315
07-18-2017, 02:24 AM
2. ### T-test versus ANOVA

Hi all, I have two groups that I need to compare on several different dependent variables. I am wondering why I would choose to use a one-way...

• Replies: 17
• Views: 24,838
03-06-2014, 03:03 PM
3. ### Test on expectation, when the variance is ignored

We compute the estimator of the variance, s-square. My question is why we not use the value of the expectation in the null hypothesis to compute a...

• Replies: 17
• Views: 2,844
11-27-2013, 12:29 PM
4. ### Hypothesis when seeking no differences

Hi everyone, and thanks in advance for any help that is offered. I am working on my dissertation proposal and hit a bit of a wall when deciding...

• Replies: 17
• Views: 3,455
03-17-2015, 03:00 PM
5. ### A question about determining significance

Hi guys I'm trying to compare the differences in the results of a fitness test done by two different methods (and performed on a sample group of...

• Replies: 16
• Views: 7,618
05-12-2010, 03:10 AM
6. ### unbiased estimator for 1/p of geometric distribution

Suppose X is a random variable with geometric distribution, and parameter p, 0<p<1, how do you find a statistc that is unbiased estimator of 1/p? Do...

• Replies: 16
• Views: 19,218
12-09-2012, 10:11 PM
7. ### How calculate intercept with multiple regression

I am familiar with calculating the intercept, etc for a regression equation, but I am confused as to how to calculate the intercept when using...

• Replies: 16
• Views: 41,414
01-15-2014, 12:07 AM
8. ### Anyone great at Statistics and want to make \$40 for about 30 mins. of your time?

I'm conducting an online assessment. It's via a tutor website (USA based and well known) think artificial intelligence. I have a master account and...

• Replies: 16
• Views: 5,334
07-03-2011, 12:33 AM
9. ### Reconcile ANOVA and Tukey significances

My ANOVA (SPSS) of means over six years gives F(5, 364) 2.42 p = 0.035. A Tukey post hoc gives a lowest p = 0.094 between the first and last years...

• Replies: 16
• Views: 4,988
08-08-2011, 10:28 PM
10. ### Calcualtion of % Change

Hello, Let us say that we have the prices of x products in two different dates, say d1 and d2. I want to calculate the % change of all these...

• Replies: 16
• Views: 4,279
09-15-2011, 07:29 PM
11. ### which optimal bin width formula to choose for histogram

For histogram construction, I learned from that for Gaussian distributed samples, 3.49*sigma*N^(-1/3) is optimal as the bin width. However, for...

• Replies: 16
• Views: 22,376
12-15-2011, 07:04 PM
12. ### Factos analysis on Likert Data

I am trying to run a factor analysis on the results of 3 surveys. When I put in each survey individually, SPSS gives me a KMO number in the .6 to .7...

• Replies: 16
• Views: 4,121
02-28-2012, 02:53 PM
13. ### Statistics question - can somebody answer

The Mensa Company designed two tests, Test 1 and Test 2 which both measure intelligence. The two tests are standardized and have the same...

• Replies: 16
• Views: 3,630
04-27-2012, 01:53 PM
14. ### Should you transform skewed data when the distribution is expected?

Hi all, I have been discussing this topic all week with people in my department and I can't seem to get a straight answer. I was taught long ago...

• Replies: 16
• Views: 17,449
06-12-2013, 07:29 PM
15. ### preferred equation display

I'm looking for people's opinions on the best way to present the same equation.Below are a series of differently formatted equations. Which equation...

• Replies: 16
• Views: 4,197
08-18-2012, 08:53 AM
16. ### how to calculate prevalance of obesity in spss using bmi values

i am a newbie and i dont know how to calculate prevalance of obesity in spss using bmi values

• Replies: 16
• Views: 21,809
09-09-2012, 11:35 AM
17. ### Likert scale data and regression

First I know that in theory the independent variables don't assume any given distribution. But in fact that can't be true or you would use...

• Replies: 16
• Views: 5,432
09-21-2012, 04:11 PM
18. ### Need to find a specific cut-off point (or maybe turning point)

Is there an elegant way to find a specific patient age, after which there would be a significant decline in the incidence of a condition? I think it...

• Replies: 16
• Views: 3,413
04-19-2013, 02:56 AM
19. ### Test Statistic and P-value Calculation???

A 1995 survey indicated that 7% of the adolescents in this age group had tried marijuana. Assuming 7% was the true value in 1995, you want to perform...

• Replies: 16
• Views: 3,901
05-15-2013, 06:10 PM
20. ### looking for help statistics

please help iv tried and dont know where to begin.

• Replies: 16
• Views: 3,039
02-10-2014, 08:44 PM
21. ### Constrain a value to be between -1 and 1

I asked this question a while back and never found an answer. After reading my multilevel book I realized the answer from the logit link...

• Replies: 16
• Views: 3,102
04-13-2014, 11:57 PM
22. ### Significant p-value, but 95%CI includes 0

Hello everyone, I have the following problem: The result of a Pearson correlation (sample size = 177) was significant, r = .127, p = .048...

• Replies: 16
• Views: 5,214
06-12-2014, 03:05 PM
23. ### Hypothesis testing???

Hi, I have a homework problem I need help with...if anyone could help or even point me in the direction of similar examples, I would be grateful! I...

• Replies: 16
• Views: 9,197
10-05-2014, 03:38 AM
24. ### Post-hoc after ANOVA < 0.05

Working on tests for some survey questions for a dissertation. I am able to reject one Hypothesis with a 0.042 One way ANOVA. I have 5 groups in...

• Replies: 16
• Views: 4,134
12-23-2014, 06:49 PM
25. ### Calendar dates 'encrypted' in geometric calculations?

This is no throwaway post and it basically targets people who are mathematically and philosophically (very) open minded. 2 geometric calculations...

• Replies: 16
• Views: 2,257
10-27-2015, 11:43 PM
26. ### Cope with distributions that may take negative numbers

Hi to everyone, I would like to know how to cope with distributions that may take negative numbers when it is physically impossible. For instance,...

• Replies: 16
• Views: 2,719
09-15-2016, 09:27 AM
27. ### Computing Power

I know that power is one minus beta...but how do you calculate beta?

• Replies: 15
• Views: 7,277
10-12-2005, 11:25 PM
28. ### introduction to stats

i am a new student to statistics and was looking for some help. my question is. i have made a bar graph and then it asks what the main feature of...

• Replies: 15
• Views: 6,519
09-13-2008, 04:25 AM
29. ### standard deviation of multiple sample sets

I'm trying to determine the standard deviation of multiple sample sets (measurements A, B, C taken on 3 different days), for which I know the means...

• Replies: 15
• Views: 99,767
srk
09-07-2014, 01:28 AM
30. ### t-test (beginner)

Hey everyone, I'm trying to teach myself statistics for work. And I have the following question: Let’s say that I’m doing a paid search campaign...

• Replies: 15
• Views: 5,843
03-18-2011, 01:47 PM
31. ### Two way repeated measures ANOVA and sphericity problems

Very grateful for any kind of comments on this topic (i'm very confused): I've been running an experiment in which I've been treating the same...

• Replies: 15
• Views: 6,527
08-11-2011, 12:49 AM
32. ### Simple question about individual values being sig different from population mean.

Hi I was wondering if someone could help. Say I have a sample of numbers 5,6,7,5,6,7,5,6,5,4 and I want to test which of these individual...

• Replies: 15
• Views: 4,811
09-29-2011, 09:02 AM
33. ### using excel solver for linear programming ,desicion optimisation

I have a statistice project on linear programming , desicion optimisation.Using excel solver.Have to find senstivity too.Can you tell me any easy way...

• Replies: 15
• Views: 6,017
11-21-2011, 04:16 PM
34. ### standardizing a standard score?

Is there anything wrong with standardizing a standardized score? I have some scorers and I first want to standardize their results by person. So...

• Replies: 15
• Views: 3,677
12-08-2011, 07:53 PM
35. ### 6 out of 6

Anyone buy this argument? Thoughts? I'd like some way to write it up and this is my best shot .... A certain validation procedure requires a...

• Replies: 15
• Views: 4,212
02-02-2012, 01:04 AM
36. ### G*Power Sample Size Calculation

Hi Everyone, First, let me say that I am thrilled to find this forum! It has been a while since I have taken Stats I and II, and I will be the...

• Replies: 15
• Views: 16,219
07-16-2012, 03:59 PM
37. ### IRT question

I am not sure item response theory is statistics as defined here or not:shakehead but I have a question to correct on my comps that I have been...

• Replies: 15
• Views: 4,141
09-19-2012, 03:11 PM
38. ### Moe, Hannah, and Mathguy chatting it up

Mittens suﬀers from Romnesia an average of 5 times per week. However, Joe “I’m just sayin’” Biden claims that Mittens rarely suﬀers from fewer than...

• Replies: 15
• Views: 2,898
11-07-2012, 01:17 AM
39. ### Need some advice on normality and tests

Hi, First I would like to thank you for this wonderful forum with lots of useful information :) I have two samples for which I'm trying to...

• Replies: 15
• Views: 3,538
11-21-2012, 02:32 PM
40. ### Confidence interval ratio/proportion?

Hi, I'm having a question concerning a confidence interval for a percentage share and I would appreciate if someone could help me. I have data...

• Replies: 15
• Views: 3,204
02-08-2013, 09:11 AM
41. ### Missing Data

I am very new to statistics but I am looking for some common practice regarding this subject. I have entities which have an arrival time, but in...

• Replies: 15
• Views: 3,155
04-18-2013, 11:36 AM
42. ### Upper level Stats course kicking my butt.

I am having a lot of trouble in my stats class and can't afford to drop it. I am looking for a way to receive help online so my first problem I need...

• Replies: 15
• Views: 2,645
09-17-2013, 07:59 PM
43. ### Binary mixed-model logistic regression using lmer() of lme4 for multilevel analysis

In my experiment, each patient has been observed twice, once using placebo and the other time using the real treatment. I want to assess the...

• Replies: 15
• Views: 11,963
08-27-2013, 04:07 PM
44. ### Is my solution correct?

The mean amount purchased by a typical customer at The Effin Computer Store is \$400 with a standard deviation of \$28. Assuming a normal distribution,...

• Replies: 15
• Views: 3,665
06-27-2014, 01:00 PM
45. ### Coefficient of Variation

Hi all, Please bear with me as I'm not a good stats guy. If I have a dataset of groups of people's weights with SDs: Group 1: 78kg (5): COV...

• Replies: 15
• Views: 2,774
06-28-2015, 11:47 AM
46. ### Standard Deviation - Moving Range

I would like to create an individuals control chart. I need to calculate the standard deviation using moving range. I was given the answer of 3.39. I...

• Replies: 15
• Views: 4,922
07-15-2015, 03:04 PM
47. ### Is hierarchical multiple regression a form of multillevel regression?

Is hierarchical multiple regression a form of multillevel regression? I've tried Googling it, searching on statistic books and I just can't seem to...

• Replies: 15
• Views: 3,822
09-06-2015, 01:26 AM
48. ### Wilcoxon and Mann-Whitney Test

Hello, I need to do one of these two statistical tests, I have a database on the consumption of fuel rods in each of the regions of my country,...

• Replies: 14
• Views: 2,215
12-12-2014, 01:21 PM

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