1. Announcement:
Dason ‎(Devorador de queso)
05-10-2017
Views:
2,717
+ Post New Thread
Page 14 of 295 First 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 64 114 ... Last
Threads 781 to 840 of 17646

# 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: 200,091
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: 68,408
09-30-2005, 09:44 AM
1. ### The appropriate regression analysis

The study is about the factors (Independent Variables) affecting a choice between two alternatives (Dependent Variable). The study includes a...

• Replies: 6
• Views: 2,233
10-27-2016, 07:22 PM
2. ### How to determine sample size for a cost-per-conversion experiment

Hi all, I am trying to perform a scientific experiment in online marketing which would be focused on lowering the cost per customer acquisition. ...

• Replies: 0
• Views: 650
10-27-2016, 08:51 AM
3. ### Designing an experiment

Could you plz answer this question? A firm is attempting to evaluate the quality of its sales staff and is trying to find an examination, or...

• Replies: 1
• Views: 989
10-27-2016, 12:19 AM
4. ### NCE: how to find population mean/variance/standard error

I have been given a homework problem with NCE with an average score of 100, and individual's score of 130. Can anyone guide me to a resource that...

• Replies: 5
• Views: 983
10-26-2016, 04:06 PM
5. ### Bland Altman plot: Log-transformation and back transformation of LOA

Hi, I am new to this forum and hope someone can help me with this issue: I want to compare two methods with a Bland Altman plot. The...

• Replies: 0
• Views: 1,917
10-26-2016, 10:41 AM
6. ### Controlling for a Variable that directly affects both independent and dependent var

Sorry this may be a very basic question but I was wondering what statistical method I can use to control for this. Let's say I am measuring if X...

• Replies: 1
• Views: 1,837
10-26-2016, 06:48 AM
7. ### What method to choice?

Dear TalkStat friends, I have merged two databases (a=22,000 cases;b=12,000 cases). The two databases are the following a= diabetes screening...

• Replies: 5
• Views: 1,741
10-26-2016, 05:12 AM
8. ### Comparing two groups for equivalence / non-inferiority

Hello, First post - newbie here. I work in medicine and currently working on a project that involves comparing the outcomes of two groups of...

• Replies: 2
• Views: 2,148
10-25-2016, 05:03 PM
9. ### Linear regression Equation?

Hi All, I need to determine whether two continuous variables are positively associated or not. I believe that this required a simple linear...

• Replies: 4
• Views: 2,114
10-24-2016, 04:51 PM
10. ### Choosing the right statistical test

Hello, I have a data set like: Different men group Diets Preference(0 no preference/1 preference) A FI ...

• Replies: 0
• Views: 1,323
10-24-2016, 02:31 AM
11. ### Bemused by student question.

We have taken a simple random sample to estimate the mean of a population. A student asked me - The numbers near the middle of our sample will...

• Replies: 9
• Views: 2,595
10-23-2016, 06:50 PM
12. ### Sampling Distribution Question

I found an question while reading the textbook, but i not really understand how to answer it, hope to get some help from you guys. A restaurant...

• Replies: 1
• Views: 4,864
10-22-2016, 03:06 PM
13. ### How to compare 2 groups where 1 has repeated measures

Hello, I have three groups: healthy controls, pre-surgery, and post-surgery. The pre and post-surgery are the same patients who participated in...

• Replies: 3
• Views: 1,908
10-22-2016, 09:01 AM
14. ### How to show statistical significance of one choice in a 4 choice question?

Participants are shown a video of two performers. They are then asked to select an option from the following 4 choices: 1. Performer A exhibits...

• Replies: 1
• Views: 995
10-21-2016, 07:48 PM
15. ### Comparing the differences between two samples

Okay, it has been quite a few years since I have really used any statistics concepts so I am puzzled on what is probably a simple problem that is...

• Replies: 1
• Views: 1,130
10-21-2016, 06:44 PM
16. ### Z scores

Scores on a statistics final were normally distributed with a mean of 75 and a standard deviation of 8? -What proportion of the scores were above...

• Replies: 4
• Views: 901
10-20-2016, 09:14 PM
17. ### Finding factors from a collected survey using SPSS

Dear all, I have a pool of data collected from over 1,000 participants. All of them filled out the same survey containing the same questions. The...

• Replies: 0
• Views: 955
10-17-2016, 07:14 PM
18. ### Unsure about the range(s) to use for double integration

f(x,y)=c(x+y); 3<x<7, 2<y<4, x>y i am supposed to find the value of c. i know i have to integrate the double integration of f(x,y) and then...

• Replies: 1
• Views: 2,002
10-17-2016, 06:32 AM
19. ### Help!! a little confused with ANOVA, should be easy

Dear all, I would like to ask for your help in determining which test I should run for my samples. Here is my data: I have 4 water samples of...

• Replies: 3
• Views: 1,193
10-16-2016, 03:52 PM
20. ### Does anyone know how to do this?

An independent-measures research study compares three treatment conditions with a sample of n = 10 in each condition. The sample means are M1 = 2,...

• Replies: 3
• Views: 1,935
10-15-2016, 09:01 PM
21. ### Stratified Samples - Introductory Statistics

Good evening, My name is Simran & I am a student who is taking introduction to statistics. I have no clue on what I am doing here and would...

• Replies: 1
• Views: 984
10-15-2016, 03:54 PM
22. ### Standard Uniform Distribution

Hi, how to prove that U~uniform is equivalent to (i.e. if and only if) ~uniform{0,1,2,...,n-1} for all positive integers n. is the floor function. I...

• Replies: 9
• Views: 2,188
10-15-2016, 03:14 PM
23. ### Which type of test to use?

I have a data set of 58 records. Question 1: I want to view compare mean SAT scores by male/female. 40% of the records are Male, 60% female. ...

• Replies: 0
• Views: 1,052
10-15-2016, 02:29 PM
24. ### Which type of test to use?

I have a data set of 58 records. Question 1: I want to view compare mean SAT scores by male/female. 40% of the records are Male, 60% female. ...

• Replies: 0
• Views: 1,673
10-15-2016, 02:04 PM
25. ### Calculating a test statistic

Basically I have to run a simulation based on this information. http://imgur.com/Mv9g9RP But I have no idea how to calculate the test...

• Replies: 1
• Views: 1,344
10-15-2016, 10:16 AM
26. ### Significance test for questionnare

Hello everybode I would be forever greatfull for some guidence. I have been browsing the internet for 2 hours now but not gotten any spot on answer...

• Replies: 2
• Views: 1,370
10-15-2016, 07:50 AM
27. ### Incomplete factorial or nested effect??

Hi all, We have some doubts about which exact model fits the following data: It is a 2 factor design, where one of the factors (storage...

• Replies: 1
• Views: 1,003
10-15-2016, 03:13 AM
28. ### Beginner: Guidance Required in studying effect of dichotomous var on ratio

Hi, I have a simple test where I want to measure the effect of a couple of variables on an outcome. Independent: Var_1: Dichotomous, particular...

• Replies: 6
• Views: 1,655
10-14-2016, 10:06 AM
29. ### interpreting f-values within a n-way anova

Hi, f-value determines the statistical significance of a main effect. I would like to find out in if the following is valid: 2 f-values for the 2...

• Replies: 6
• Views: 2,398
10-14-2016, 08:51 AM
30. ### Large Sample Confidence Interval for the Mean - Problem is it right ???

The president of Jones Bank asked his research team to determine the average waiting time for its customer. A study of 100 customers was conducted...

• Replies: 3
• Views: 1,135
10-14-2016, 07:02 AM
31. ### Should splitting data improve the standard error?

I am simulating random samples of 20 from normal data mean 20, SD 5. The SE of the mean should be SD/sqrt(20) = 1.12. If I estimate the SE from...

• Replies: 5
• Views: 1,008
10-14-2016, 02:17 AM
32. ### Run regression in matched groups?

Hi, I have 3 groups of data. SGA: <5% birth weight, AGA: 5%≤birthweight≤95%, and LGA: >95% birth weight. 50 SGA and LGA cases were selected...

• Replies: 0
• Views: 995
10-12-2016, 09:51 PM
33. ### Statistical tests to use when comparing different Likert scales?

I am conducting a research to test for participant motivation in a social movement project. I have grouped the motives into 5 different categories...

• Replies: 1
• Views: 2,084
10-12-2016, 04:15 AM
34. ### sum of errors not 0

I was just looking at some numbers (percentages, if that's useful for this question), and I've been really confused by something: my errors do not...

• Replies: 4
• Views: 1,398
10-11-2016, 08:13 AM
35. ### Testing for interaction effect btw two continous variables.

Hi, I have 3 variables, A, B and C. All of them are continuous, assymetrical in distibution. Using sperman correlations, I've found that A/B (A...

• Replies: 5
• Views: 1,299
10-11-2016, 05:29 AM
36. ### 1-sample binomial for my research data?

Hi, Newbie here so I will try to explain as clearly as I can. I do research in the neuro field. I have a control group of neurons that I am...

• Replies: 1
• Views: 1,715
10-11-2016, 12:16 AM
37. ### New guy "stumped" on a HW problem

Hello, I found this forum and hoped I would be able to get help with a problem that is just consuming all of my time. It involves finding the...

• Replies: 0
• Views: 1,186
10-10-2016, 09:17 PM
38. ### Assume that radon measurements are normally distributed

with mean 4.1 and standard deviation 0.2. -Find the median of the measurement? -What is the probability the radon measurements exceed 4.5...

• Replies: 1
• Views: 1,300
10-09-2016, 08:00 PM
39. ### Need help with two problems involving Poisson Distribution

Let me clarify something first. I already know the answers. What I need to know are the steps I need to take. The first one I couldn't solve myself....

• Replies: 4
• Views: 2,614
10-09-2016, 08:20 AM
40. ### Test the validity of a sample from a survey

Dear All, I have someone extracted a 30% raw data from a full Household Survey. I am not sure how he extracted the 30%, I am worried that the 30%...

• Replies: 0
• Views: 1,141
10-09-2016, 06:43 AM
41. ### Help with simple CI for proportion using SRS

I'm having difficulty with the following problem: Imagine you are a gerontologist who is interested in investigating the proportion of households...

• Replies: 5
• Views: 1,470
BK3
10-09-2016, 01:11 AM
42. ### Significance Percentage for Average Gift Size

Hi, I am looking for some help here. I work for a non profit organization and we sent out a direct mail package to donors - a standard control and...

• Replies: 0
• Views: 1,549
10-08-2016, 07:15 AM
43. ### CI for "Conversion Rate"

In digital media, we have a metric called "conversion rate", which is simply conversions / impressions. Impressions represent the total number of...

• Replies: 1
• Views: 826
10-08-2016, 06:41 AM
44. ### Question on Standard Error

If I need to compute the standard error for a bunch of students' test averages, and there are 20 students, each of whose score is itself an average...

• Replies: 2
• Views: 1,094
10-08-2016, 03:34 AM
45. ### Paired T test sample size

I'm dealing with a study that compares three different daily regimens of one drug in same patients (morning, noon, evening). Blood parameter that...

• Replies: 0
• Views: 869
10-08-2016, 02:26 AM
46. ### Select and Delete Missing

Hi all, I'm looking to find a syntax-based method for deleting cases that contain ANY values/date, OR, to delete cases with missing values. I'm...

• Replies: 0
• Views: 1,436
10-06-2016, 07:37 PM
47. ### Lower/Upper confidence limits for 5/9 point rating scales

If you have a rating scale such as are used on product websites where users enter scores 1,2,3,4,5 (five values) and averages are (presumably)...

• Replies: 0
• Views: 1,230
10-05-2016, 05:14 PM
48. ### Inferential Stats: Estimating Pop St. Deviation/Variance - Chi Square

Hello, I have questions regarding some elements of Estimating a Population Standard Deviation via the Chi Square method... Please note that I am...

• Replies: 1
• Views: 1,561
10-05-2016, 09:06 AM
49. ### Simulation

Hi Guys I'm working on 800 bivariate data. ( loss & Expense) . I've found fitted distribution which was Pareto. I also worked on Copula to find the...

• Replies: 0
• Views: 1,209
10-05-2016, 04:52 AM
50. ### Why experiment outcome is against universal endorsement-no blinding or subject error?

Hi, Thanks for attention! Here's the question I am struggling with: Medical researchers studying the effects of a low carb diet versus a...

• Replies: 1
• Views: 2,614
10-03-2016, 11:15 PM
51. ### What is the p-value in a rank-biserial correlation?

Hello, can someone tell me how to compute the p-value in a rank-biserial correlation? I understand the rank-biserial correlation coefficient is a...

• Replies: 3
• Views: 3,062
10-02-2016, 09:50 PM
52. ### Help with homework

On a homework assignment, I have a data set with the variables (in SPSS) 1) Age 2) Reactiontime (continuous) 3) drug (Placebo, or drug...

• Replies: 0
• Views: 1,020
10-02-2016, 01:28 PM
53. ### How to prove the magnitude of improvement (two data sets)?

Hi Guys! I am struggling a bit with some statistical validations. Currently using Google Analytics in order to get data from my website. Testing...

• Replies: 2
• Views: 1,163
10-02-2016, 10:36 AM
54. ### question about data description

Dear forum members, I have a tibble called smoke, containing 300 rows (one row for each subject) and two variables (group and race.) Group takes...

• Replies: 1
• Views: 1,266
10-02-2016, 01:23 AM
55. ### Bionomial Probability Distributions

51% of men consider themselves professional baseball fans. You randomly select 10 men and ask each if he considers himself a professional baseball...

• Replies: 5
• Views: 3,320
10-01-2016, 04:14 PM
56. ### Am I interpreting this correctly?

I have a continuous DV and 2 categorical + 1 continuous IVs. In spss I did a univariate analysis and found a main effect of one of the categorical...

• Replies: 0
• Views: 1,198
09-30-2016, 07:21 PM
57. ### Binomial Distribution : Probability equation solution

Question :In a binomial distribution for p=.48, q=1-p=.52 find the population size n1 so that P(X>=3)=.95 My solution : P(X>=3)=.95 can be...

• Replies: 2
• Views: 1,640
09-30-2016, 12:03 AM

+ Post New Thread
Page 14 of 295 First 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 64 114 ... Last

#### Thread Display Options

Use this control to limit the display of threads to those newer than the specified time frame.

Allows you to choose the data by which the thread list will be sorted.

Note: when sorting by date, 'descending order' will show the newest results first.