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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: 197,128
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: 66,938
09-30-2005, 09:44 AM
1. ### T-Test Question

Hi Everyone, I'm 98% done with my statistics homework, and I'm just stuck on one issue. To make a long story short, I was asked to do...

• Replies: 1
• Views: 2,437
10-07-2006, 04:00 PM
2. ### Which Statistics To Use?

I am looking at the effects of 4 different driving training methods on 4 different groups of people. My dependent variables are thier number of...

• Replies: 3
• Views: 2,203
10-07-2006, 12:46 PM

Hi I am trying to do some tests and I need some advice. I am comparing scores on two different questionnaires given to around 1000 people. The issue...

• Replies: 1
• Views: 2,365
10-07-2006, 08:45 AM
4. ### Needing some assistance with this problem (true proportion)

Here's the problem: A U.S. Travel Data Center's survey of 1500 adults found taht 42% of respondents stated that they favor historical sites as...

• Replies: 1
• Views: 5,903
10-07-2006, 08:41 AM
5. ### Logistic Regression

I am a distance learning student with a project on hand. I am new to stats and would be seeking help from colleagues. Thanks I am confused about two...

• Replies: 0
• Views: 2,690
10-06-2006, 06:52 AM

HOw do you solve a problem like this one. Let X~N(3,4) P ...it should be greater than or equal to. Thanks.

• Replies: 2
• Views: 2,387
10-06-2006, 01:44 AM
7. ### More On Sampling Distributions.....

Okay so I started on this one too....but once again I don't know if my method is correct.... Suppose that the distribution of all male students on...

• Replies: 1
• Views: 3,866
10-05-2006, 06:51 PM
8. ### Sampling Distributions....

I am sorry....but I have no idea how to go about setting this problem up.... Heights of male students. To estimate the mean height of u...

• Replies: 1
• Views: 5,058
10-05-2006, 05:34 PM
9. ### Comparing Median and Median Absolute Deviation (MAD)

Hi, I have 3 focus groups each consisting of 4 people. They all rated a list of quality indicators (ratings were between 1 to 9, 1 being less...

• Replies: 1
• Views: 8,166
10-05-2006, 05:32 PM
10. ### what is the purpose in plotting moving average??

• Replies: 1
• Views: 8,047
10-05-2006, 05:25 PM
11. ### item to total correlation?

I want to purify a scale, so I want to test for three things: Doing a principal components EFA I assess: a. Internal consistency. I will use...

• Replies: 0
• Views: 5,243
10-04-2006, 10:33 PM
12. ### Help finding IRR

I have a problem that I am doing for a basic Engineering statistics class that goes like this: You take out a loan to pay the remaining 15,000 on...

• Replies: 1
• Views: 4,373
10-04-2006, 10:05 AM
13. ### Simple effects analyses not so simple!

Need some help as to what way should the simple effects of an age_category (young, old) x condirtion (A, B, C, D, E) interaction be analysied for the...

• Replies: 3
• Views: 4,534
10-04-2006, 10:00 AM
14. ### 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: 2,909
10-03-2006, 07:45 PM
15. ### 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: 2,032
10-03-2006, 02:19 PM
16. ### 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: 5,698
10-03-2006, 12:53 PM
17. ### 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: 2,567
10-02-2006, 08:14 PM
18. ### 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: 3,337
10-02-2006, 05:47 PM
19. ### 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: 2,680
10-02-2006, 05:46 PM
20. ### 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: 2,031
10-02-2006, 05:45 PM
21. ### 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: 2,125
10-02-2006, 05:43 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: 1,805
10-02-2006, 05:41 PM
23. ### 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: 3,214
10-02-2006, 05:38 PM
24. ### 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: 4,441
10-02-2006, 05:36 PM
25. ### 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: 3,307
10-02-2006, 05:34 PM
26. ### 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: 3,003
10-02-2006, 01:38 PM
27. ### 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: 3,202
10-02-2006, 09:55 AM
28. ### 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: 3,466
10-02-2006, 08:17 AM
29. ### 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: 3,998
10-01-2006, 09:21 PM
30. ### 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: 2,747
10-01-2006, 01:13 PM
31. ### 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: 3,000
10-01-2006, 12:55 PM
32. ### 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: 10,166
10-01-2006, 08:19 AM
33. ### 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: 5,762
09-30-2006, 08:53 AM
34. ### 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: 3,908
09-29-2006, 11:10 AM
35. ### 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: 3,592
09-29-2006, 10:11 AM
36. ### 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: 4,899
09-28-2006, 11:58 PM
37. ### 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: 3,404
09-28-2006, 06:33 PM
38. ### 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: 2,357
09-27-2006, 07:29 PM
39. ### 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: 3,295
09-27-2006, 01:33 PM
40. ### 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: 2,233
09-27-2006, 12:52 PM
41. ### 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: 2,409
09-27-2006, 11:06 AM
42. ### 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: 4,033
09-25-2006, 05:36 PM
43. ### 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: 12,026
09-25-2006, 02:40 PM
44. ### 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: 6,088
09-24-2006, 12:44 PM
45. ### 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: 2,670
09-22-2006, 01:15 PM
46. ### 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: 4,372
09-22-2006, 01:06 PM
47. ### 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: 2,983
09-22-2006, 07:25 AM
48. ### 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: 1,973
09-21-2006, 04:01 PM
49. ### 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: 5,669
09-21-2006, 01:45 PM
50. ### 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: 2,244
09-21-2006, 01:11 PM
51. ### 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: 4,415
09-21-2006, 06:57 AM
52. ### 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: 5,704
09-21-2006, 05:13 AM
53. ### 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: 2,571
09-20-2006, 02:01 PM
54. ### 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: 3,889
09-20-2006, 01:06 PM
55. ### 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: 3,411
09-20-2006, 12:54 PM
56. ### Moved: a probability problem

• Replies: -
• Views: -
09-19-2006, 08:17 PM
57. ### 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: 2,348
09-19-2006, 11:13 AM
58. ### 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: 3,626
09-19-2006, 09:31 AM

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