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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: 197,080
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: 66,915
09-30-2005, 09:44 AM
1. ### Calculating Combinations: C(n,k)

Hi, I need help with a combinations calculation question, please. I'm working on a study in which I need to compare a common outcome of 7...

• Replies: 2
• Views: 1,253
03-25-2014, 06:08 AM
2. ### Appropriate analysis for Likert scale items.

Hey, everyone! Quick question regarding analysis of survey (which aims to asses women's views and attitudes towards offenders with mental health...

• Replies: 7
• Views: 2,168
03-24-2014, 02:47 PM
3. ### 4th-variance?

Hello any and all, I am no statistician so does the term "4th-variance" mean anything to someone? I am attempting to replicate the technique found...

• Replies: 0
• Views: 1,647
03-24-2014, 01:49 PM
4. ### X-bar and R chart question

Hi, If anyone could help me understand the logic of the following question, that would be much appreciated! Q: A process is in control at...

• Replies: 4
• Views: 4,261
03-24-2014, 11:48 AM
5. ### True positive having a negative value

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

• Replies: 2
• Views: 1,349
03-24-2014, 10:45 AM
6. ### Interpreting Confidence Interval Data

• Replies: 1
• Views: 1,233
03-24-2014, 05:36 AM
7. ### Nested Anova - Use sums instead of mean?

Dear all, At the moment, I'm trying to do a 'Nested Anova'. I have several years (2004 to 2012) and four seasons. So a nested anova is called for...

• Replies: 4
• Views: 1,090
03-24-2014, 01:41 AM
8. ### Bootstrap and boundary region

Hi, I have got 3 questions. Many thanks for your precious help. 1) One way of carrying out the bootstrap is to average equally over all...

• Replies: 1
• Views: 6,704
03-24-2014, 01:29 AM
9. ### Normalizing Data

Hi all, I have a very small dataset (1 independent variable with 7 levels, each with only 3 data values). I assume I would need to test if the...

• Replies: 5
• Views: 1,810
03-23-2014, 04:18 PM

I am working on project that is comparing two types of corn and their crop yield. For each corn variety they were planted in various soil types and...

• Replies: 1
• Views: 1,208
03-23-2014, 04:08 PM
11. ### Confused about a question on random samples, population and variances

Here is the question along with the solution: Here is my attempt before looking at the solution: Looking back at my attempt, I realize it...

• Replies: 1
• Views: 973
03-23-2014, 03:31 PM
12. ### Which analyze to perform on frequencies

Hello all, I have made a survey with some likert-scale from 1 to 5 and got some answers. I have one question that is asking something like, Is...

• Replies: 3
• Views: 1,231
03-23-2014, 12:37 PM
13. ### Puzzled: Which method to use with variances as raw data?

Hi All Many Thanks! This is out of my depth. Appreciate if any of the members would give some ideas on which method? I was given the raw data...

• Replies: 0
• Views: 1,105
03-23-2014, 11:20 AM
14. ### Very significant findings - but how do I show that? What's a binomial choice?

Hi all, I'm writing a paper based on one which uses 'binomial choice'. I can't seem to find this in textbooks, what's the most common name for it?...

• Replies: 10
• Views: 1,277
03-23-2014, 08:42 AM
15. ### Need method for analysing two sets of time course data

Hello, I have two sets of time course data, they are for an eye-tracking study. The data is 20 100ms chunks, one category being percent fixations for...

• Replies: 0
• Views: 849
03-23-2014, 12:32 AM
16. ### very basic standard dev. & probability question

ok. first dont laugh at me for being a simpleton. im more of a man of letters than numbers. i took a total of one math class my entire college...

• Replies: 0
• Views: 899
03-22-2014, 10:28 PM
17. ### What type of test should I run?

Hello, I need to do a statistical analysis on some data for a engineering project of mine. Ok, so what I need to do is prove that my robot can sense...

• Replies: 0
• Views: 1,202
03-22-2014, 04:37 PM
18. ### I need help - Which Method of Hypothesis Testing

I'm working on a stats paper, and I am completely lost, stats is pretty out of my grasp and I am having a hard time... I am writing a research...

• Replies: 0
• Views: 807
03-22-2014, 02:17 PM
19. ### Sum of independent Poisson random variables problem

There are 3 parts to the problem. The statement is the discrete rvs X1,.., Xn are independent & each Xi has the Poisson distribution. Part (i) is...

• Replies: 1
• Views: 1,294
03-22-2014, 11:50 AM
20. ### quick question

Hi I have a quick question that I can't seem to get the answer to The question is According to the Ryerson Accounting Firm, the chances of your...

• Replies: 0
• Views: 1,033
03-22-2014, 09:00 AM
21. ### Non-parametric version of 2x4 ANOVA

I'm trying to figure out this statistical analysis in SPSS; I have 2 IVs, one with 2 levels and one with 4 levels, and 1 DV which is normally...

• Replies: 0
• Views: 1,160
03-22-2014, 08:17 AM
22. ### One side paired t-test for finding which mean (out of two) is significantly higher?

Hi, I am trying to learn stat and it seems i have a verryyy long way to go. :shakehead Here is my problem - I have to compare two series of...

• Replies: 2
• Views: 935
03-22-2014, 02:37 AM
23. ### t-test for independent samples question

Hello all, I'm looking for a little help with a research problem I'm working on. Without getting into the nitty-gritty of the details (which I can...

• Replies: 8
• Views: 1,754
03-22-2014, 01:29 AM
24. ### Quick question about which tests I should perform!

Hi Everyone, I am fairly new to the world of statistics as I work mainly in the clinical field. I have a query regarding which statistical test I...

• Replies: 0
• Views: 1,311
03-21-2014, 10:03 PM
25. ### Controlling for Type 1 Errors: Post-hoc testing on more than 1 ANOVA

I have conducted several repeated-measures ANOVA's with post-hoc testing via Tukey's HSD whenever the omnibus F-test was significant. I'm having some...

• Replies: 0
• Views: 2,335
03-21-2014, 12:42 PM
26. ### Confidence intervals vs. p -value

Hi, we just had a very interesting discussion about the role of confidence intervals and p values in determining significance and I realised there...

• Replies: 0
• Views: 2,985
03-21-2014, 04:02 AM

how do i interpret a 95% confidence interval which is presented in percentages with no standard deviations. (this is for a medical essay) two...

• Replies: 14
• Views: 2,013
03-21-2014, 03:18 AM
28. ### Chebyshev Problem

Hi fellow statisticians, I am having difficulties with solving the following question: Assume a beverage filling company is supposed to fill...

• Replies: 1
• Views: 1,337
03-20-2014, 11:17 AM
29. ### comparing estimators

I'm comparing the following 4 estimators of location of the Cauchy distribution: Let x_{1},..x_{n} be observations and \$l\$ be the log likelihood...

• Replies: 1
• Views: 1,566
03-20-2014, 09:48 AM
30. ### Need Help Finding Data

Lame of me, I know. However, I am having trouble finding exactly what I need. If anybody with a bit better knowledge than me can help me find this...

• Replies: 0
• Views: 1,072
03-19-2014, 11:17 PM
31. ### how to calculate the cost

I have a question: one patient take two kinds of drug. the first drug cost \$35 and he take 7 days. the second drug cost \$75 and he take 3 days. how...

• Replies: 0
• Views: 1,282
03-19-2014, 09:23 PM
32. ### NEed help interpretting anova statistics

I apologize for my ignorance, but I have no statistics background and so am having a lot of trouble interpretting my data. We ran an experiment to...

• Replies: 1
• Views: 1,171
03-19-2014, 04:44 PM

Hi guysss i am new here , and in statistical classs I need help to much for these excercise Use a computer and generate 50 random samples, each...

• Replies: 0
• Views: 1,210
03-19-2014, 04:10 PM

Hiya, I have been trying for ages to get my head around this and i am still so unclear. I am looking at a set of 20 local gyms and seeing out...

• Replies: 8
• Views: 1,586
03-19-2014, 03:51 PM
35. ### Mixed Model for Repeated Measures? How to analyze data help SPSS

Hi, So I need help determining how to analyze my data with SPSS. I'll briefly describe the study design. It is repeated measures at 4 time...

• Replies: 3
• Views: 2,220
03-19-2014, 01:32 PM
36. ### Intro to Statistics Assignment help

Hey guys, I have a few questions on my intro to statistics assignment that I need some help on. Question #1 2a. This seems like a weird...

• Replies: 1
• Views: 1,592
03-19-2014, 11:17 AM
37. ### Help please! Tests for normality of data

Hi all, I've produced two data sets as part of a research project, but cannot tell if one of them is normally distributed, since the Shapiro-Wilk...

• Replies: 2
• Views: 1,526
03-19-2014, 10:14 AM
38. ### paired t-test or linear regression?

Hello, I am applying for an IRB to evaluate the effect of lidocaine (local anesthetic) dilution on pain and duration of intradermal anesthesia. ...

• Replies: 12
• Views: 3,012
03-19-2014, 06:45 AM
39. ### Confidence interval when data is in range

I am trying to calculate the confidence interval when data is given in range. Example: Rather than telling their exact age in years, 9 sample...

• Replies: 0
• Views: 1,232
03-18-2014, 09:20 PM
40. ### Creating new variable from coefficients

Hi I'm new to stata so just bear with me. I'm doing a VAR using inflation as my dependent variable and exchange rate as an independent...

• Replies: 2
• Views: 1,495
03-18-2014, 07:47 PM
41. ### What statistical analyses to use? How age influences bone density

So I have a variable, lets say Bone density in older adults. I have200+ participants ranging from 50-80 years and with its respective bone...

• Replies: 7
• Views: 9,954
03-18-2014, 03:04 AM
42. ### [ AP STATISTICS ] Quiz 6.2B - Standard Deviation/ Mean Problem.

Solved. Mods may delete this now :)

• Replies: 2
• Views: 7,283
03-17-2014, 08:59 PM
43. ### Interpreting similarity coefficients

I am interested in finding out a good measure of similarity to determine if two sets are significantly similar to each other. I know there are many...

• Replies: 1
• Views: 2,760
03-17-2014, 08:15 PM
44. ### How to test dependent means with unequal sample size? Weighted Paired T-test?

I am comparing the percent of a population that are juvenile between 'Autumn' and 'Spring' at many sites. The Sample size (n) is variable among the...

• Replies: 0
• Views: 1,661
03-17-2014, 01:44 PM
45. ### One-sample t-test, is this reasonable?

Hi all, I am asked to construct a one-sample hypothesis testing in my assignment. I have collected data on GDP for 40 African countries, then I...

• Replies: 9
• Views: 1,488
03-17-2014, 09:35 AM
46. ### [URGENT] Prove Cox Snell residuals ~= exp(1)

Hello all, While studying a past mid-term for a survival analysis course, I've come across a questions that troubled me so. The questions...

• Replies: 0
• Views: 1,256
03-16-2014, 04:34 PM
47. ### Measuring relationship (correlation?) between continuous and categorical variables

Really struggling with this so really appreciate help. I want to measure the difference between language scores (scores between 1 and 300) and 6...

• Replies: 4
• Views: 2,402
03-16-2014, 04:22 PM
48. ### Justify the use of parametric tests on non normally distributed data

Hello there. I have 5 Likert scale questionnaires that have been answered by the same people who have been randomly selected (N=24) and i have the...

• Replies: 4
• Views: 7,860
03-16-2014, 03:48 PM
49. ### Analysing Sales Data and Finding Patterns / Information

Hi all, I stumbled across this page while trawling the net for ideas on how to work out my assignment. I was wondering whether anyone could...

• Replies: 0
• Views: 869
03-16-2014, 11:25 AM
50. ### Analysis headache: Hi, first timer and a little confused

Hi there I hope you can help. I have done so much reading I feel I have tied myself in knots. I'm looking to find out the statistical test I need to...

• Replies: 0
• Views: 1,215
03-16-2014, 05:46 AM
51. ### Repeated measures 2-way ANOVA: Significant interaction but non-significant post hoc

Hi everyone, I was wondering if statisticians can explain why ANOVA can yield a significant interaction but no significant differences in the post...

• Replies: 0
• Views: 2,975
03-16-2014, 02:42 AM

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