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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: 66,855
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: 196,951
07-16-2014, 11:01 AM
1. ### Power of one sample test for variance

Hi, I have been trying to test the following hypotheses. H0 : sigma = 10 H1 : sigma != 10 the sample size is 200 and the sigma observed is...

• Replies: 1
• Views: 2,900
09-15-2006, 10:09 PM
2. ### multiway frequency analysis, Canonical correlation

I have a set of survey report of my college students who decided to change to other schools. There were 3,000 students surveyed over the 10 year...

• Replies: 1
• Views: 3,358
09-17-2006, 09:39 AM
3. ### Stratified Samples ???

Hi, I'm having some trouble with this question. The question asks Stratified samples are widely used to study large areas of forest. Based...

• Replies: 4
• Views: 9,529
09-17-2006, 07:45 PM
4. ### How to compare Probit means between two groups.

I have calculated probit median (mean) ages of attainemnt of various stages (skeletal maturity) for two independent groups of subejcts. How can I...

• Replies: 2
• Views: 4,048
09-18-2006, 11:28 AM
5. ### Symmetric or not?

I know that when the mean and the median is close in values to each other, the distribution will be symmetric. But how close should they be? I have...

• Replies: 1
• Views: 3,780
09-18-2006, 01:20 PM
6. ### Confusion!!

Hello, I am new to stats and have a couple basic questions regarding sampling , the central limit theorem and probability. If the sample size...

• Replies: 1
• Views: 3,108
09-18-2006, 01:25 PM
7. ### Empirical rule & Negative intervals

When calculating interval I got a negative interval: (-6406371 -> 14892937) I have to make a statement about the percentage that you would...

• Replies: 1
• Views: 5,793
09-18-2006, 01:26 PM
8. ### more permutations

find the number of ways of arranging the letters of MATCHING if; a. there are no restrictions; b. the first letter must be M; c. the odd numbered...

• Replies: 3
• Views: 3,058
09-18-2006, 08:31 PM
9. ### More questions about symmetry

How can a distribution be symmetric and be positively/negatively skewed? What does reasonably symmetic means? What do they mean by a distribution...

• Replies: 1
• Views: 2,365
09-18-2006, 08:35 PM
10. ### permutations

1. A combination lock has 60 different positions. To open the lock, you move to a certain number in a clockwise direction, then to a number in the...

• Replies: 2
• Views: 3,806
09-18-2006, 08:44 PM
11. ### Which Tests are appropriate?

I have created a survey where participants state their agreement with my statements on a 7 point likert scale. Also 3 category questions, eg their...

• Replies: 6
• Views: 3,616
09-19-2006, 09:31 AM
12. ### sample size determination

Sample size determination: Our database: There is a historical code preference from our customer. We like to give some credit to the customer who...

• Replies: 0
• Views: 2,334
09-19-2006, 11:13 AM
13. ### Moved: a probability problem

• Replies: -
• Views: -
09-19-2006, 08:17 PM
14. ### Thoughts on appropriate comparison tool

Greetings from a new joiner! Great forum! I had a question about analysis. I have a decent background in analysis, though have been "out of...

• Replies: 4
• Views: 3,394
09-20-2006, 12:54 PM
15. ### Central Limit Theorem ???

Hi, I'm having trouble understanding this problem. Our professor gave the answer to study with, but I can't understand why the probabilities...

• Replies: 1
• Views: 3,879
09-20-2006, 01:06 PM
16. ### Which test to use?!

Hi, I'm having to use nonparametric methods to analyse some data owing to an abnormal distribution which results from a disprortionate number of...

• Replies: 6
• Views: 2,563
09-20-2006, 02:01 PM
17. ### Floor Effects

Hi! I want to compare two groups on an accuracy measure (measured as a %). I have assessed the ditribution of scores for each groups, and while...

• Replies: 2
• Views: 5,695
09-21-2006, 05:13 AM
18. ### Sample size for regression equation?

If I know what I want in terms of confidence level and interval, is there some rough way to gauge how large a sample size I need for an equation of...

• Replies: 4
• Views: 4,399
09-21-2006, 06:57 AM
19. ### Interaction Model

Hi everyone! This is a really nice site, and i am glad for finding it in google. I want some help to run an interaction model. I have a...

• Replies: 0
• Views: 2,237
09-21-2006, 01:11 PM
20. ### Discrete or Continuous

Can someone please tell me if I got these right... The number of cups of coffee sold in a cafeteria during lunch = DISCRETE The cost of a...

• Replies: 1
• Views: 5,649
09-21-2006, 01:45 PM
21. ### Index making

Hi, I've been struggling with this one for months now: I've done a survey which tries to link objective to subjective data The project is...

• Replies: 0
• Views: 1,965
09-21-2006, 04:01 PM
22. ### interaction effects in regression analysis

hello all together, maybe someone could help me with this. I've conducted a regression analysis including an interaction term. as a result it...

• Replies: 4
• Views: 2,975
09-22-2006, 07:25 AM
23. ### Acceptable Pins

Hello, I am drawing a complete blank for some reason on the second half of this problem. It is the age old acceptable pins problem. The mean is...

• Replies: 1
• Views: 4,356
09-22-2006, 01:06 PM
24. ### Simple dice problem

I shold know the answer to this but it's been many years.... I toss a dice 120 times. How do I calculate the probability of correctly guessing...

• Replies: 1
• Views: 2,666
09-22-2006, 01:15 PM
25. ### Linear Programming

Hello, I have the following linear programming question: Company 1: maximize: z=3x1+4x2+6x3+x4 subject to: x1+x2 <= 500 x3+x4 <= 50 x1+x3 <=...

• Replies: 1
• Views: 6,075
09-24-2006, 12:44 PM
26. ### Food service satisfaction survey - 4 point Likert scale

Good morning, This is my first posting... I am a dietitian with a master degree. I am doing research in Clientele satisfaction (i.e. quality of...

• Replies: 3
• Views: 11,994
09-25-2006, 02:40 PM
27. ### t-test dependant sample

If I want to compare means of one group pre and post intervention, does it matter if the follow up time was different for the pre intervention and...

• Replies: 4
• Views: 4,011
09-25-2006, 05:36 PM
28. ### guidelines on doing a good statistic report ?

Hi all, are there any links or samples of good statistic reports for reference? i need to prepare a statistic reports with a max of 8 pages(with...

• Replies: 0
• Views: 2,393
09-27-2006, 11:06 AM
29. ### Normal distribution in the exponent

In excel, if you raise the normal distribution to an exponent why do you get exponential growth? i.e. if e^0=1 then when you have S=Se^w, where ...

• Replies: 0
• Views: 2,225
09-27-2006, 12:52 PM
30. ### help-logistic regression model

i ran a logistic model with 6 variables. but lift is one 1.5 at top 5% scored target list. P-value for each variable is small, (0.000), i just don't...

• Replies: 0
• Views: 3,281
09-27-2006, 01:33 PM
31. ### probably an easy problem!!

I have a somewhat simple statistical problem, but i'm not sure if I'm doing this right. The mean and standard deviation on a test were 50 and 20,...

• Replies: 1
• Views: 2,349
09-27-2006, 07:29 PM
32. ### Anyone know how to do Correlation and Regression?

I'm working on problems dealing with correlation and regression. It tells me that I can use the TI-83 calculator and punch in paired data lists L1...

• Replies: 0
• Views: 3,397
09-28-2006, 06:33 PM
33. ### Repeatability

Hi Folks, I am a newbie in stats. I had a couple of questions which I would really appreciate if you could take the time to answer. I want to...

• Replies: 0
• Views: 4,887
09-28-2006, 11:58 PM
34. ### Average of Standard Deviation?

I am hoping this is an easy one. I have employees that work at different stores on different days of the week. My employees have different start...

• Replies: 1
• Views: 3,584
09-29-2006, 10:11 AM
35. ### power analysis

i'm helping out with the power analysis for a study that is using 6 independent variables and one dependent variable. orginially, i suggested a...

• Replies: 7
• Views: 3,893
09-29-2006, 11:10 AM
36. ### new to linear programming

hello all i just started to learn about linear programming and solving and boy i got a long problem to deal with..i am not asking anybody to do it...

• Replies: 0
• Views: 5,750
09-30-2006, 08:53 AM
37. ### average of two means from the same data?

I've been given two means from the same data set (split into people who said yes and no) from this i have to find the mean of the total of the data....

• Replies: 2
• Views: 10,147
10-01-2006, 08:19 AM
38. ### Converting Mean to Z Value

I have a few problems to figure out where I need to convert x intervals to a z interval. I used this format: z = x-u/o. I became confused where...

• Replies: 1
• Views: 2,987
10-01-2006, 12:55 PM
39. ### Which Statistics Test Do I Use?

We are giving 400 people a survey asking them the following about our phone services, what statistical test do we run for each of these? 1.) As...

• Replies: 5
• Views: 2,739
10-01-2006, 01:13 PM
40. ### HELP! Which stat test do I use???

I am currently working on my Masters thesis and am having some difficulties with what test to use for my data. I am comparing intelligence tests and...

• Replies: 5
• Views: 3,987
10-01-2006, 09:21 PM
41. ### p-charts for complaint monitoring

I am in a position where I am looking at complaints for different products. It has been tradition to monitor the complaints using a modified p-chart...

• Replies: 6
• Views: 3,462
10-02-2006, 08:17 AM
42. ### cointegration and dummy variable

If we have a time series with shift dummies and test it for cointegration with another time series, do we have to include the dummies in the time...

• Replies: 0
• Views: 3,190
10-02-2006, 09:55 AM
43. ### Chi-Square Goodness of fit Test

Hi, I would like to know the minimum number of times it is necessary to throw a dice to run a Chi-Square Goodness of fit Test (and get...

• Replies: 1
• Views: 2,992
10-02-2006, 01:38 PM
44. ### Assumptions of t-test

Just a quick question (hopefully). Can I use a between-groups t-test (assuming unequal variances) if one of the two groups I'm comparing (but not the...

• Replies: 1
• Views: 3,295
10-02-2006, 05:34 PM
45. ### Interpret...?

Hey, I'm trying to do this lab for my Stats Class but I'm a little confused. It says: "11. Calculate and interpert r and r^2 for the data." What...

• Replies: 2
• Views: 4,427
10-02-2006, 05:36 PM
46. ### Level of Measurement?

My current homework requires this.Im having some trouble with getting things in line. What category meaning (nominal, ordinal, interval, or ratio) do...

• Replies: 1
• Views: 3,208
10-02-2006, 05:38 PM

1.Given f(-1) = 0.15, f(1) = 0.29, f(3) = 0.21, and f(5) = 0.35, find P(X ≤ 1) 2.Given f(-1) = 0.15, f(1) = 0.29, f(3) = 0.21, and f(5) = 0.35,...

• Replies: 1
• Views: 1,801
10-02-2006, 05:41 PM
48. ### Statistical test used

We are testing 4 different training methods on a group of drivers and want to determine if there are any differences among the 4 methods. We are...

• Replies: 1
• Views: 2,116
10-02-2006, 05:43 PM
49. ### Instructor rating versus performance

Hello, I am trying to figure out the following problem: Let's say we have driving instructor teaching a group of students how to drive and along...

• Replies: 1
• Views: 2,024
10-02-2006, 05:45 PM
50. ### Stats Test?

Hi there, Can you help me with what test to use in the following example situation: It is predicted that the driver training method "A"will...

• Replies: 1
• Views: 2,667
10-02-2006, 05:46 PM
51. ### ANOVA vs. MANOVA

Can you provide a good example that can describe the differences between ANOVA vs. MANOVA? I know the primary differences is that MANOVA involves...

• Replies: 1
• Views: 3,327
10-02-2006, 05:47 PM
52. ### Inferential/Descriptive Statistics?

I cant figure out each of the following correct answer. (a)By examining the results of a statewide poll it was estimated that 52% of the...

• Replies: 1
• Views: 2,562
10-02-2006, 08:14 PM
53. ### How to combine several data sets

I have hourly logs of web server response times that I need to combine into a daily summary. I don't have the original source data or I would just...

• Replies: 3
• Views: 5,686
10-03-2006, 12:53 PM
54. ### Relationships between variables

Hello, Our current research work involves analysis of relationships between variables based on historical data. In general, the dataset is in the...

• Replies: 0
• Views: 2,027
10-03-2006, 02:19 PM
55. ### control charts-type I error

My control chart has a type I error rate of 0.0027 (3 standard deviations). I am comparing 5 months of signals to my baseline UCL. Am I inflating...

• Replies: 1
• Views: 2,903
10-03-2006, 07:45 PM

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