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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: 66,982
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: 197,205
07-16-2014, 11:01 AM
1. ### 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: 4,546
10-04-2006, 10:00 AM
2. ### 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: 4,380
10-04-2006, 10:05 AM
3. ### 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: 5,247
10-04-2006, 10:33 PM
4. ### what is the purpose in plotting moving average??

• Replies: 1
• Views: 8,059
10-05-2006, 05:25 PM
5. ### 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: 8,221
10-05-2006, 05:32 PM
6. ### 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: 5,064
10-05-2006, 05:34 PM
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: 3,871
10-05-2006, 06:51 PM

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: 2,389
10-06-2006, 01:44 AM
9. ### 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: 2,692
10-06-2006, 06:52 AM
10. ### 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: 5,904
10-07-2006, 08:41 AM

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: 2,370
10-07-2006, 08:45 AM
12. ### 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
13. ### 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: 2,442
10-07-2006, 04:00 PM
14. ### Exponential Distribution problem

I am having trouble undestanding this question: The daily failure rate of an electrical component follows an exponential distribution with...

• Replies: 0
• Views: 2,107
10-07-2006, 04:44 PM
15. ### Logistic Regression - Odds Ratio's

Hi, I am attempting to interpret the SPSS output used in direct logistic regression. In the Parameter Estimates table the Exp(B) output's are: .473;...

• Replies: 1
• Views: 2,959
10-08-2006, 04:34 PM

Probability distribution for RV X is given by f(x) = { 1/5 for 2 < x < 7; 0 elsewhere find P(3 < X < 5) as a fraction. also, Show that f(x)...

• Replies: 0
• Views: 1,552
10-08-2006, 09:35 PM
17. ### Linear Correlation Coefficient

The text book that I am using does not explain step by step how they used the linear correlation coefficient equation to get the answer. When I...

• Replies: 1
• Views: 2,238
10-08-2006, 09:37 PM
18. ### Standard Error Question

Greetings! I'm working on a stats assignment and I'm stumped. I've searched several websites and looked through both my current and former stats...

• Replies: 0
• Views: 1,970
10-09-2006, 12:05 AM
19. ### clarification logistic regression

Dear friends, I put this up some days back, but it seems to have missed attention. Could somebody help me out. Thanks. I am a distance learning...

• Replies: 0
• Views: 2,467
10-09-2006, 10:40 AM

I have to produce stats for my manager on number of help desk calls fixed each month but the monthly average is inaccurate when compared to a whole...

• Replies: 1
• Views: 2,363
10-09-2006, 03:56 PM
21. ### Repeated Measure on Categorical Data

A group of subjects was tested and re-tested with the same set of measures over a 3-months interval. A total of three sets of scores were collected,...

• Replies: 1
• Views: 4,118
10-09-2006, 08:39 PM
22. ### ANOVA help

Hi All, I have to compute an ANOVA table by hand, and I've only been given total scores for each group, sample size for each group, and...

• Replies: 1
• Views: 2,615
10-09-2006, 08:52 PM
23. ### Unbalanced Data Designs

I have four sampling groups with the following sample sizes for each N=201,120,10,40 Question (1) I need to run an ANOVA to determine each groups...

• Replies: 1
• Views: 4,496
10-09-2006, 09:08 PM
24. ### Badly need assistancr L Regression

Dear JohnM, It looks everything is falling on you. I badly need assistance on this issue which I am putting up for the third time. Please help out....

• Replies: 0
• Views: 1,778
10-10-2006, 10:25 AM

Hello. First-time poster here. I've been having trouble trying to figure out how to analyze some data, and I would really appreciate some help. ...

• Replies: 0
• Views: 1,923
10-11-2006, 01:53 PM
26. ### Samping distribution question

Hello, I am doing work on sampling distributions however I do not understand these questions or what I am supposed to do, if someone could clear it...

• Replies: 0
• Views: 2,398
10-12-2006, 10:07 AM
27. ### Probability help

I'm trying to set up a probability analysis to determine if a recall is necessary. We found one of our 13 machines started to break down fairly...

• Replies: 0
• Views: 1,839
10-13-2006, 11:53 AM
28. ### Chi-squared test

Hi, I think I'm right in thinking I should use a chi-squared contingency table test here because the data is nominal, but it seems to over-simplify...

• Replies: 3
• Views: 2,955
10-15-2006, 01:01 AM
29. ### how to interpret the sign of a t-value

Hi, If you did a t-test against the null hypothesis involving the beta coefficients from a multilinear regression, how would you interpet the sign...

• Replies: 0
• Views: 5,642
10-15-2006, 08:28 AM
30. ### Determining modality

Hello, I have a large number of spectra with gaussian-distributed noise superimposed on to it. There are large parts of the spectra where we know...

• Replies: 0
• Views: 2,873
10-16-2006, 11:13 AM
31. ### I need help with stats

I have couple of questions that I don't know how to answer. how the standard error of the mean is calculated. Is the standard error of the mean...

• Replies: 1
• Views: 3,865
10-16-2006, 11:33 AM
32. ### Question about Significance in a binary system

I do not have an extensive stistics background, but do have a better than average mathematical background. My question is regarding a binary system...

• Replies: 1
• Views: 2,271
10-16-2006, 02:39 PM
33. ### I need help!

Hi everyone, Here is my situation: I have never in my life taken a statistics course. I have an exam for a position with the state of CA on 10/18....

• Replies: 0
• Views: 1,866
10-16-2006, 03:53 PM
34. ### Expected Value and Standard Dev.

I need some guidance with the following...please help!! Scenario: You pay \$10 and roll a die. If you get a 6, you win \$50. If not, you get to...

• Replies: 0
• Views: 7,272
10-16-2006, 06:15 PM
35. ### Confidence level 99%

Hi, I just getting confused by these two questions below. In the survey described in the previous exercise, there were 1050 borrowers whose...

• Replies: 1
• Views: 4,297
10-16-2006, 09:40 PM
36. ### mean/variance

Scores on an examination are normally distributed with mean 75 and variance 22. a. What is the probability that a student scores 70 or higher?...

• Replies: 2
• Views: 2,025
10-17-2006, 07:44 AM
37. ### Help!!

Hi everyone, any ideas on how to prove the following? I am nearly there but can't get it right, any help would be greatly appreciated. Many thanks ...

• Replies: 0
• Views: 1,428
10-17-2006, 08:57 AM

Okay here is the questions Refer to table 3 in the article and focus on the row " Perceptions of parent efficacy". Explain the meaning of each...

• Replies: 0
• Views: 1,642
10-17-2006, 04:56 PM
39. ### Do I have to Normalise & Standardise?

Hi Everyone :wave: new here (and new to stats so bear with me!) Here is my task (in brief). I have 600,000 call records, each with an age and...

• Replies: 1
• Views: 2,632
10-18-2006, 06:17 AM
40. ### Explaining Statistical conclusions--confidence intervals

I am having a problem explaining what exactly the confidence interval gives me.....for example, If you say that "I am 95% confident that the...

• Replies: 1
• Views: 2,742
10-18-2006, 06:18 AM
41. ### Which test: binary dependent, ordinal independent

Dear Colleagues, Which test do I use when I have a binary dependent variable (Join a company or not join) and an ordinal independent variable...

• Replies: 0
• Views: 3,536
10-19-2006, 04:41 AM
42. ### Joint Probability Function HELP!!!

Let the joint density function of X and Ybe given by: f(x)={kxy^2 for 0<x<y<1 {0 otherwise what is the value of k? Can...

• Replies: 1
• Views: 2,712
10-19-2006, 11:54 AM
43. ### How to start - analyzing - Plizzzzz Help really needed

:confused: :confused: Hi. I'm lost in statistics: Is a two factorial design. I have two treatments and a control. :confused: One factor is...

• Replies: 0
• Views: 1,644
10-19-2006, 05:08 PM
44. ### Beginner needs help

Question on my first assignment in statistics: The adjacent data summarize daily absences for an assembly plant. The HR director wonders if absence...

• Replies: 4
• Views: 3,289
10-19-2006, 11:06 PM
45. ### mean or median for presenting statistics

I am currently writing a paper and I am in a dilemma about which statistics to use when I present the descriptive data. Some of the data is normally...

• Replies: 3
• Views: 2,509
10-20-2006, 07:43 AM
46. ### density function

I am struggling with density functions. Can you help with this? Let Y have the density function given by .4, ...

• Replies: 1
• Views: 7,222
10-20-2006, 07:50 AM
47. ### How do I explain this to other students?

This is a problem that a student I am tutoring brought to me and I am not sure how to solve it or explain it to him, can you give me any suggestions?...

• Replies: 1
• Views: 2,768
10-21-2006, 10:49 AM
48. ### Have I chosen the right analysis?

I am analysing changes that happened in a merger. It is an archival study utilizing survey data. I have a set of 9 survey items (5 pt scale) that I...

• Replies: 0
• Views: 1,677
10-21-2006, 12:25 PM
49. ### How do I get either conditional or joint probabilities if I'm given the prior...

How do I get either the conditional and joint probabilities if I'm given the prior and posterior probabilities. I'm doing a decision analysis that...

• Replies: 2
• Views: 2,371
10-21-2006, 01:24 PM
50. ### Reporting Means

If n=149 and you have one case each for a few of the outcomes with an exceptional result, do the single cases get discussed in "results" for a...

• Replies: 0
• Views: 2,104
10-22-2006, 01:53 AM
51. ### Nominal data - how thick am I?!!!

Help needed!!! I'm currently completing my dissertation on sustainable procurement - looking at the buying practices of staff and suppliers to my...

• Replies: 0
• Views: 2,650
Ali
10-23-2006, 10:59 AM
52. ### Greenhouse-Geisser and effect size

Hi, The data I am currently looking at is from a 2-way repeated measures ANOVA. My question is what do you recommend for a measure of effect size...

• Replies: 0
• Views: 4,062
10-23-2006, 01:49 PM
53. ### Log transform

Hi, When should I transform my data into log? Thanks!

• Replies: 2
• Views: 4,274
10-23-2006, 04:46 PM
54. ### E(X)===> Help with Expectation problem

Assume the length X in minutes of a particular type of telephone conversation is random variable with probability density function f(x)={1/5...

• Replies: 2
• Views: 5,109
10-23-2006, 04:57 PM
55. ### Lost in stats!

The amount of time one spends in a bank is exponentially distributed with mean 10 minutes. a.) What is the probability that a customer...

• Replies: 0
• Views: 1,728
10-23-2006, 05:53 PM
56. ### Mean

The lifetimes of interactive computer chips produced by a certain manufacturer are normally distrubuted with aprameters u = 1.4 x 10^6 hours and ro =...

• Replies: 1
• Views: 2,818
10-23-2006, 07:00 PM
57. ### How to prove an exponential function?

hi! My problem is that i have a large sequence of inter-arrival times and i want to know how can i prove that they are indeed exponential? i draw...

• Replies: 2
• Views: 4,842
10-23-2006, 07:05 PM

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