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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### 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: 66,954
09-30-2005, 09:44 AM
2. ### 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: 197,166
07-16-2014, 11:01 AM
1. ### Rampaging somethings in the something something system

i am strugling with the following question i cant seem to get my head around it....the standard deviation of the the masses of 800 blocks is 252kg. A...

• Replies: 0
• Views: 1,221
a.j
10-30-2012, 02:12 PM
2. ### Final project, help profavor! :)

I forgot about the sampling thing, so here's the question (sorry if too long) Obtaining a representative sample from a population: The population...

• Replies: 5
• Views: 3,391
12-11-2011, 09:10 PM
3. ### Sum of squares model proof

Hello everyone :-) I'm trying my best to prove the formula for the sum of squares model (please excuse how badly i'm going to write this) ...

• Replies: 1
• Views: 1,157
02-20-2014, 02:54 PM
4. ### T-Test for 2 Independent Means or T Test for 2 Dependent Means

I am comparing two blood glucose meters. I am using a blood sample from the same finger, at the same time using two different blood glucose meters....

• Replies: 3
• Views: 1,536
05-01-2016, 09:43 PM
5. ### Logistic regression vs T tests, and multiple response sets

Hi, this is a great forum you have here, so I thought I'd ask a small, silly question that's been bugging me for a while. A few weeks ago, I...

• Replies: 5
• Views: 7,772
11-22-2010, 10:05 AM
6. ### 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: 4,654
10-22-2016, 03:06 PM
7. ### What hypothesis test?

I have a population of Z items, where X must pass and Y must fail. The thing is that the X that pass is not just a count (i.e. if 2 must pass, it...

• Replies: 3
• Views: 1,869
10-09-2014, 08:14 AM
8. ### ANOVA -- what is this question asking for?

An animal scientist recorded the information in the following table from an experiment dealing with wool length measured on twelve sheep randomly...

• Replies: 5
• Views: 3,770
03-18-2011, 10:44 AM
9. ### Cumulative distribution function?

A scientist wants to see if the following "survival times" (hours of operation prior to failure) for a particular component in a machine follow what...

• Replies: 1
• Views: 3,620
BGM
03-18-2011, 05:18 PM
10. ### SPSS Statistics: Significant Differences between follow-up scores independent groups

Hi, I have collected data on scores for a sample population before, 1 year after and 6 years after an intervention. All participants in the...

• Replies: 0
• Views: 675
04-02-2017, 06:46 AM
11. ### Is it normal to get a perfect fit using Lisrel to conduct CFA?

I am using Lisrel to do Confirmatory Factor Analysis. The result is that the Chi-Square statistic for 2 degrees of Freedom is 0.000413 (p=1.00). I...

• Replies: 1
• Views: 2,891
09-16-2011, 10:11 AM
12. ### Choosing best model in regression - Backwards Stepwise + hierarchical modeling?

Hello - my goal is to fit a model using backwards stepwise regression and hierarchical modeling, testing the association between a primary predictor...

• Replies: 1
• Views: 2,217
08-19-2013, 03:43 PM
13. ### Contingency Tables

I am doing AS Level Statistics, i just finished S1 and started doing S2 however, my teacher is not that experienced at teaching A level, so...

• Replies: 1
• Views: 5,983
02-01-2007, 11:04 PM
14. ### AS Statistics - Time Series Analysis (S2)

Hello all My teacher was teaching us Time Series Analysis qiute a while ago and when he was explaining it i didn't understand properly and didn't...

• Replies: 0
• Views: 4,213
05-09-2007, 10:24 AM
15. ### Help: contingent ranking, sample size and random

Hi, I have to research the preferences of respondents for items of which the levels of the attributes do not vary (each item has sevens fixed...

• Replies: 0
• Views: 1,551
09-07-2009, 02:05 AM
16. ### How to calculate credibility interval limits

Hi everyone. I'm working on detecting drug adverse reaction signals using health insurance data. I have a problem in getting credibility interval...

• Replies: 1
• Views: 3,360
BGM
09-06-2011, 08:47 PM
17. ### Wilcoxon signed rank test help

Hi - I have data that I wish to perform this statistical test upon but there are a few things i am unsure about, i hope somebody can help! The...

• Replies: 0
• Views: 4,100
12-13-2006, 12:14 AM
18. ### Probability Question

Hello I am reviewing one of my exams for my final and am very confused when it comes to this question; The probability that at least one of the...

• Replies: 6
• Views: 1,436
12-13-2013, 08:42 PM
19. ### Reverse Coding in GSS, Brief Explanation Requested

I am doing a data analysis project in my statistics class and my professor liked all the data tables that I had found for my proposal and asked me to...

• Replies: 0
• Views: 1,855
10-11-2014, 07:16 PM
20. ### Comparing groups- what test to use

Hello, I am looking to compare the means for two groups (midfield - forward; top - bottom) against each other. Could someone please assist me...

• Replies: 6
• Views: 1,417
02-19-2014, 07:09 AM
21. ### Scoring System Help Please

Hi, Im currently completing a research proposal and need to create a scoring system. I have two sets of data which I'm comparing statistically....

• Replies: 0
• Views: 894
12-12-2015, 12:26 PM
22. ### Elementary stats help; Hypothesis testing amongst 2 proportions

so I conducted a survey on sleep habits and I need help on whether or not I reject or fail to reject my original hypothesis. I have to use a...

• Replies: 1
• Views: 1,105
03-22-2013, 06:44 AM
23. ### What test to use with 1 group?

Hello Please provide assistance on what test to use for: 1 group with n = 500 Research QS: Is listening to whistling a problem? Question...

• Replies: 1
• Views: 1,241
07-06-2016, 05:04 AM

hi Please help me to prove this question here and not transferring me to other pages Show that s^2 is an unbiased estimator for sigma^2 I need...

• Replies: 2
• Views: 4,936
03-13-2011, 11:25 PM
25. ### Creating a Bell Curve with 3 performance parameters

Hi. I need to create a 20-70-10 performance bell curve for about 500 people using 3 equally weighted performance parameters. I have put all these...

• Replies: 0
• Views: 4,108
05-17-2010, 08:28 AM
26. ### Z-scores for two likert scales?

I am conducting survey research that has both an online and paper component. There is a descrepancy between the online and paper versions on one of...

• Replies: 0
• Views: 4,501
09-04-2009, 01:14 PM
27. ### Rejecting or not rejecting the null hypothesis.

A city council is considering drafting legislation related to the exclusion of renters with children. Since implementation will be expensive, they...

• Replies: 1
• Views: 4,156
11-11-2016, 01:22 PM
28. ### Main effect not significant, interaction significant

Hi, I've got some data which is normally distributed, and I have just run a two-way ANOVA on it, with two levels per group. The main effect is...

• Replies: 4
• Views: 4,252
05-22-2013, 08:27 PM
29. ### Silly question about the exponential distribution

So, a product has an expected lifetime of 50 days. So lambda is 50. The mean of lambda is 1/50, meaning that every day there is a 1/50 chance of a...

• Replies: 4
• Views: 1,228
05-09-2014, 08:36 PM
30. ### Standard deviation of two sets from only individual set descriptive statistics

I have two sets of numbers and I have access to their averages and standard deviations. However, I do not have easy access to the actual numbers...

• Replies: 2
• Views: 1,315
12-11-2014, 08:22 AM
31. ### Knowledge discovery

Hi, I have 100000 units with 10 attributes (attr1, attr2, attr3, etc...) For instance: unit attr1 attr2 attr3 ... 1 a ww ...

• Replies: 0
• Views: 1,781
07-02-2010, 04:42 AM
32. ### significant p-value?

hello I am writing an essay, and I got an r value of 0.1018 at the data I am looking at. the sample size is 13 regions of a country. would this...

• Replies: 12
• Views: 3,316
06-14-2014, 02:13 AM
33. ### hypothesis testing by mean levels

hi everyone... i have this homework.. i tried to solve it... can anyone check if it's right or not, please?? Question: The maximum acceptable...

• Replies: 1
• Views: 8,878
11-11-2010, 03:42 AM
34. ### HLM Question

Hello, I am looking at some data on what predicts exam results (outcome variable). I have 2 level 1 predictors (IVs) which are socioeconomic...

• Replies: 0
• Views: 1,526
04-16-2009, 05:17 PM
35. ### Q related to chi-square

Hi guys, I wanted to analyses categorical data using chi-square test. My sample size is 20. I wanted to see if there is any relationship between my...

• Replies: 3
• Views: 1,607
01-27-2012, 06:21 PM

Hello guys, I want to analyze categorical data; and I have three independent variables. My sample size is 20. Could you please tell me which test...

• Replies: 1
• Views: 1,859
01-29-2012, 09:32 AM
37. ### White ^ Black balls

Hi guy's, I tryed to figure out couple of weeks how to solve a statistic problem with white and black balls.I kindly ask you if you can help me a...

• Replies: 5
• Views: 2,146
01-31-2016, 03:44 PM
38. ### Meaning of basic stats abbreviations

I'm not a student, I'm a writer and I'm attempting to read some raw statistics and have no idea what the numbers mean. Could someone please put in...

• Replies: 5
• Views: 16,292
11-07-2007, 08:05 PM

An unbiased instrument for measuring distance makes random errors, the distributon of which has standard deviation n, and average of 0. You're...

• Replies: 0
• Views: 1,773
11-17-2006, 06:53 AM
40. ### birthday problem

ignore this, I have solved the problem

• Replies: 0
• Views: 2,601
11-25-2006, 12:53 AM
41. ### statistical significance of conversions greater than 100%

Hi there, I am running a landing page test on Google AdWords for my retail website. The control is the current landing page where products are...

• Replies: 1
• Views: 1,151
10-09-2012, 01:44 PM
42. ### need to know number of product view to purchases I need to make a decision

On my golf equipment website, if on average 1% of product views lead to a purchase, how many views do I need on a new product to determine if it is a...

• Replies: 2
• Views: 2,068
10-24-2012, 07:30 PM
43. ### Product A vs. Product B: How many visits to my website do I need?

Let's say I have a website and I wanted to see if I could promote certain products through advertising on Google. On a given day, Product A...

• Replies: 1
• Views: 1,361
02-06-2013, 07:46 AM

Hi all, I am a newbie into stats so please bear with me :shakehead, I would appreciate your help with this simple question. Deadline is...

• Replies: 5
• Views: 5,167
09-13-2008, 11:49 AM
45. ### Drawing an ROC curve

If I have values for `sensitivity` and `specificity` fora group of studies for example like this: sensitivity specificity -----------...

• Replies: 3
• Views: 3,145
07-30-2011, 07:11 AM
46. ### ROC curve explanations

Are there resources you recommend that explain ROC curve for beginners? Thanks.

• Replies: 1
• Views: 2,318
09-15-2011, 07:31 AM
47. ### Software for drawing an ROC curve

Having the sensitivity and specificity values, what software do you recommend that enables drawing the ROC curve provided this data? Thanks.

• Replies: 1
• Views: 5,426
07-30-2011, 07:44 AM
48. ### True positive having a negative value

Is it fine if someone gets a "negative" value for the True Positive (TP)? Thanks.

• Replies: 2
• Views: 1,355
03-24-2014, 10:45 AM
49. ### Homogeneity of variances violated for two-way ANOVA, Brown-F & Welch's tests done...

But the Brown-Forsythe and Welch's tests cannot be performed because "at least one group has the sum of case weights less than or equal to 1. What...

• Replies: 4
• Views: 2,037
03-18-2016, 09:42 AM
50. ### Likert pre-post test for 3 groups

Hi there, I have data for a within-subjects study where each subject was asked to perform 3 tasks (in a randomized order to prevent learning...

• Replies: 0
• Views: 1,464
01-11-2013, 02:27 PM
51. ### Very simple question

What is the best way to determine something as simple as finding out whether the following test grades are improving (in a sequence): 46, 52,...

• Replies: 7
• Views: 2,826
06-30-2010, 09:56 AM
52. ### p-values for groups for C=B/A when you have data on B (n=10-12) and A (n=6)

For 5 groups, i recently measured property A (n=6) and property B (n=10-12). Using Excel i obtained average, stdev and standard error for each...

• Replies: 1
• Views: 807
08-13-2014, 07:44 PM
53. ### What Is The Appropriate Statistical Application For My Experiment!!!

HELLO, :confused: OKAY SO HERE WE GO!!! I HAVE APPROXIMATELY TEN SAMPLES FROM ONE GROUP, 15 SAMPLES FOM A SECOND GROUP, AND THIRTY-FOUR SAMPLES...

• Replies: 1
• Views: 3,209
06-14-2008, 08:48 AM
54. ### Cronbachs alpha and a

I am confused about the concept alpha, is there any similarities/differences between Cronbachs alpha and the alpha you set for significance? (eg....

• Replies: 0
• Views: 2,418
09-17-2007, 10:35 AM
55. ### solving for K

I have tried for a long time to find out how you solve for K in the spearman brown prophecy formula (to find out how many items is required in a test...

• Replies: 1
• Views: 3,725
10-05-2007, 01:04 PM
56. ### sample weights

Hi, we are starting a survey with 2 stage cluster sampling approach. At first stage we select a fixed number of clusters from total population and...

• Replies: 1
• Views: 3,795
06-12-2010, 01:39 AM
57. ### Survey design question

I am designing a household survey with a sample size of 400. This is a two stage design with 40 clusters selected at first stage and 10 households...

• Replies: 1
• Views: 1,139
06-17-2016, 11:53 AM
58. ### Binomial random variable help

If X = a binomial random variable with parameters n and p, with 0<p<1 How do I show that P = P Also, how do I prove that as k goes from 0 to n,...

• Replies: 1
• Views: 3,053
12-04-2006, 07:29 PM
59. ### Pca

I am using SPSS. I am using the factor analysis with extraction Eigen value more the 1. and with the rotated component matrix extracted and the...

• Replies: 1
• Views: 1,497
09-25-2008, 06:48 AM

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