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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: 197,032
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: 66,893
09-30-2005, 09:44 AM
1. ### 95% confidence interval help

How much money does the average professional football fan spend on food at a single football game? That question was posed to ten randomly selected...

• Replies: 8
• Views: 9,148
10-25-2006, 09:36 PM
2. ### trending method for count data

Does anyone have a suggestion on a charting/trending method for count data? I have reason to believe my data is not Poisson distributed because in...

• Replies: 1
• Views: 2,170
10-25-2006, 08:47 PM

My question is about z scores. To calculate probablity in a normal distribution, where we know mean and standard deviation we calculate z and then...

• Replies: 1
• Views: 2,310
10-25-2006, 08:46 PM
4. ### Normal Distribution

A set of reading scores for fourth-grade children has a mean of 25 and a standard deviation of 5. A set of scores for sixth-grade children has a mean...

• Replies: 1
• Views: 5,006
10-25-2006, 08:44 PM
5. ### Z-Statistic and proportion

Hi:) , I'm having some difficulty with this question. The question asks A matched pairs experiment compares the taste of instant versus...

• Replies: 1
• Views: 6,630
10-25-2006, 08:39 PM
6. ### t tests

Hello... t tests (like one sample, related samples, and independent) are just testing the mean of the samples means against the population mean,...

• Replies: 2
• Views: 3,047
10-24-2006, 06:31 PM
7. ### Help with null hypothesis and T-Statistics

Hi:) , I'm having problems understanding null hypothesis and t-statistics. Especially this question(below): 12. You will have complete sales...

• Replies: 4
• Views: 5,743
10-24-2006, 06:30 PM
8. ### What test to use for comparing strengths of relationship

I would like to compare the strength of one independent variable (A) on two separate dependent variables (B and C). That is, I would like to know...

• Replies: 0
• Views: 2,345
10-24-2006, 05:49 PM
9. ### Is this integration right or wrong...yes or no?

I haven't had calc in a few years and it's not coming back very easily: Are either of these correct?

• Replies: 1
• Views: 2,755
10-24-2006, 06:25 AM
10. ### Posted in wrong thread i think ill try here

OK ive been up all night its 3:02 AM here I cant get this one question: barry bonds of the san francisco giants had the highest batting average in...

• Replies: 1
• Views: 4,571
10-24-2006, 02:07 AM
11. ### In Desperate Need Of Help! Midterm Due Tomorrow

Hey, I am a first time user so I have not had time to browse other threads or anything. Anyways, I am in dire need of help, as I have a midterm due...

• Replies: 0
• Views: 2,584
10-24-2006, 12:27 AM
12. ### Newbies Question

Is there a way that statistically you can determine the cut-off point. Ex. I have a large data set looks like this ( millions of records): Code ...

• Replies: 0
• Views: 1,981
10-23-2006, 08:15 PM
13. ### 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: 4,830
10-23-2006, 07:05 PM
14. ### 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: 2,807
10-23-2006, 07:00 PM
15. ### 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: 1,718
10-23-2006, 05:53 PM
16. ### 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: 5,095
10-23-2006, 04:57 PM
17. ### Log transform

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

• Replies: 2
• Views: 4,259
10-23-2006, 04:46 PM
18. ### 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: 4,042
10-23-2006, 01:49 PM
19. ### 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: 2,644
Ali
10-23-2006, 10:59 AM
20. ### 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: 2,099
10-22-2006, 01:53 AM
21. ### 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: 2,363
10-21-2006, 01:24 PM
22. ### 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: 1,672
10-21-2006, 12:25 PM
23. ### 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: 2,759
10-21-2006, 10:49 AM
24. ### 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: 7,205
10-20-2006, 07:50 AM
25. ### 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: 2,495
10-20-2006, 07:43 AM
26. ### 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: 3,273
10-19-2006, 11:06 PM
27. ### 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: 1,636
10-19-2006, 05:08 PM
28. ### 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: 2,689
10-19-2006, 11:54 AM
29. ### 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: 3,515
10-19-2006, 04:41 AM
30. ### 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: 2,735
10-18-2006, 06:18 AM
31. ### 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: 2,628
10-18-2006, 06:17 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: 1,637
10-17-2006, 04:56 PM
33. ### 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: 1,424
10-17-2006, 08:57 AM
34. ### 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: 2,016
10-17-2006, 07:44 AM
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: 4,283
10-16-2006, 09:40 PM
36. ### 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: 7,265
10-16-2006, 06:15 PM
37. ### 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: 1,859
10-16-2006, 03:53 PM
38. ### 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: 2,257
10-16-2006, 02:39 PM
39. ### 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: 3,853
10-16-2006, 11:33 AM
40. ### 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: 2,867
10-16-2006, 11:13 AM
41. ### 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: 5,618
10-15-2006, 08:28 AM
42. ### 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: 2,942
10-15-2006, 01:01 AM
43. ### 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: 1,833
10-13-2006, 11:53 AM
44. ### 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: 2,397
10-12-2006, 10:07 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: 1,918
10-11-2006, 01:53 PM
46. ### 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: 1,772
10-10-2006, 10:25 AM
47. ### 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: 4,488
10-09-2006, 09:08 PM
48. ### 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: 2,605
10-09-2006, 08:52 PM
49. ### 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: 4,105
10-09-2006, 08:39 PM

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: 2,354
10-09-2006, 03:56 PM
51. ### 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: 2,461
10-09-2006, 10:40 AM
52. ### 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: 1,965
10-09-2006, 12:05 AM
53. ### 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: 2,235
10-08-2006, 09:37 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: 1,547
10-08-2006, 09:35 PM
55. ### 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: 2,951
10-08-2006, 04:34 PM
56. ### 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: 2,098
10-07-2006, 04:44 PM
57. ### 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: 2,429
10-07-2006, 04:00 PM
58. ### 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: 2,199
10-07-2006, 12:46 PM

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