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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: 66,829
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: 196,909
07-16-2014, 11:01 AM

Can you please help me figure out if the following questions are ANOVA or Chi Square? I have completed them to what I think is right, but I am not...

• Replies: 5
• Views: 4,763
03-17-2009, 10:14 PM

Never mind, I got help, thanks anyways.

• Replies: 0
• Views: 2,531
03-21-2009, 10:58 PM
3. ### Regression Questions!

Hello everyone! I have a couple of questions regarding regression!! How would you plot a regression line on a graph with only: i. y-intercept...

• Replies: 0
• Views: 2,426
03-23-2009, 08:51 PM
4. ### Quick Multiple Choice Question! :) Can I have your opinion Please?

My question is: Which of the following is true of the correlation coefficient (r)? a) It has units of both x and y (I know this one is incorrect...

• Replies: 1
• Views: 2,308
03-24-2009, 07:08 PM
5. ### Tips for Differentiating Between Tests! Please! :)

Hello! I have my final exam for my statistics course this week (Tuesday) and for one section we are required to differentiate between the...

• Replies: 1
• Views: 2,105
04-13-2009, 05:48 PM
6. ### Need help on this easy problem?

In July 1994 and again in April 2005, the Gallup Poll asked separate random samples of 1015 adults about their opinions on working parents. The table...

• Replies: 1
• Views: 4,053
04-28-2011, 01:09 PM
7. ### What should my next step be?

Here's the problem, I know it's a linear regression t test for slope, but I'm stuck on how to get it started. Here's the data: Researchers at the...

• Replies: 2
• Views: 2,633
04-28-2011, 08:41 PM
8. ### Combined salary

Hi! There is a problem: The following computer output comes from weekly salary information for a small company. Gender N Min Q1...

• Replies: 2
• Views: 4,470
11-23-2005, 07:50 PM
9. ### A basketball team problem

• Replies: 1
• Views: 4,689
11-23-2005, 12:14 AM
10. ### What re-expression to use?

Hello! I) I can't understand, how can I determine what re-expression to use in order to linearize the scatterplot by just looking at the...

• Replies: 1
• Views: 3,077
11-27-2005, 07:50 PM
11. ### Randomization

Hello! There is a problem: Which of the following sources of bias is eliminated by randomization? a) Researchers have a desired outcome in...

• Replies: 1
• Views: 3,695
11-26-2005, 12:08 AM
12. ### Transforming the data

Hello! I can't understand: In order to transform the data to make it appear more linear, how can I choose what transformation to use, if I don't...

• Replies: 8
• Views: 5,023
11-27-2005, 10:40 PM
13. ### Experiment

Hello! I have a question: In the experiment I have 4 treatments: 1)regular wash cycle/cold water 2)Delicate wash cycle/hot water 3)Regular/hot...

• Replies: 1
• Views: 2,910
11-30-2005, 06:20 PM
14. ### The confidence interval

I have a question: I am confused, What is the confidence interval?

• Replies: 1
• Views: 2,531
11-30-2005, 08:42 PM
15. ### Multiple Choice Question

Hello! Here is the problem: A group of eight people work on the 5th floor of the building.They all decide they want to lose weight by...

• Replies: 4
• Views: 13,493
12-10-2005, 09:25 PM
16. ### Multiple choice

Hello, I have some questions: A researcher wants to determine the mean income of adults in a particular state. She decides to tae a random sample...

• Replies: 4
• Views: 8,539
01-13-2006, 08:47 AM
17. ### Histogram

Hello, I have a question: What obvious information do histograms give. For example, I know that scatterplots show the strength and the direction...

• Replies: 6
• Views: 4,384
07-31-2014, 11:54 AM
18. ### Stanine calculation

Hey all, I have been trying to solve this problem without success, thus I'm calling for Help :( Problem: There are 103 Italian provinces ranked...

• Replies: 3
• Views: 6,436
01-29-2006, 12:28 PM
19. ### Question regarding log transformations.

I am doing a statistics project for my class and the question reads as follows: "Fit a linear model that could be used to answer whether or not a...

• Replies: 1
• Views: 1,414
11-17-2012, 06:46 PM
20. ### Data Extrapolation for SEM

Hi, I have a data of n=50. Is there any way in which I can extrapolate or simulate the data to n=2000, in order to carry out Structural equation...

• Replies: 4
• Views: 1,567
09-07-2016, 03:10 PM
21. ### Generate samples from distribution

How can I generate the samples from 0.5*delta(0.35)+0.5*delta(0.25)? Thanks in advance, Alex

• Replies: 3
• Views: 5,174
02-22-2011, 07:44 AM
22. ### GOLF scorecards combinations?

I have not find the answer in Google or elsewhere hope some one will help me find the right answer The question is about GOLF scorecards...

• Replies: 0
• Views: 902
02-29-2016, 11:19 PM
23. ### Permanova with covariate

Dear all, I have designed a permanova analysis with covariate. It is a 1factorial design 1 Factor: Site (6 levels). 1 Covariate (Algal...

• Replies: 9
• Views: 5,409
08-22-2012, 04:23 PM
24. ### Non-parametric testing

Hello everyone! I am a student doing her master thesis. I have never studied or used statistics, but have been advised to do for my thesis. Let...

• Replies: 0
• Views: 709
07-22-2015, 05:32 AM
25. ### Is Chi Square the right test to use?

Dear all, I am having a bit of trouble figuring out which test to perform in the following case: In my eye-tracking study participants are...

• Replies: 2
• Views: 2,266
07-01-2011, 07:08 AM
26. ### Taking expectation of average^2

Let x_1, x_2,...., x_n be observations from a weakly stationary time series where E(x_t) = mu. I want to find the expectaion of(periodogram with...

• Replies: 3
• Views: 1,565
alf
05-20-2012, 03:05 PM
27. ### Is t-student enough for comparing these?

Hello, I'd like to compare two methods of measuring compounds quantity on chromatography paper, which we may call method A and method B (kind of...

• Replies: 3
• Views: 1,589
11-11-2015, 08:23 AM
28. ### Comparing two measuring methods ?

Hi, I'd like to compare two devices to measure viscosity (like using two different kinds of weighing scales) on 6 different materials. Each...

• Replies: 3
• Views: 1,558
11-20-2015, 02:49 AM

Hello, this is the plotting of about 200 double measurements (measured 200 samples with 2 different methods). Could I consider the 2 methods...

• Replies: 1
• Views: 1,208
11-20-2015, 08:06 AM
30. ### How do determine min sample size for auditing medical claims by medical records?

I have a sampling methodology question I'm in need some statistical expertise with: I'm trying to determine how to calculate the minimum sample...

• Replies: 3
• Views: 10,911
08-17-2010, 10:15 AM
31. ### How do we obtain the frequencies (fi) from a table that shows only the percentages?

I have to calculate R concentration ratio: Investment Type____________________Percentage Government Bonds___________________________55...

• Replies: 2
• Views: 1,726
05-17-2011, 03:51 PM
32. ### 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: 2,639
Ali
10-23-2006, 10:59 AM
33. ### A Question on Percentiles

Hi All, I have a question on percentiles. I have some data that is in 5 minute intervals. Each 5 minute period has an average time in seconds that...

• Replies: 2
• Views: 2,771
08-09-2007, 04:48 AM
34. ### unequal sample sizes

Hello there, Please can anyone help me here? I've been lead to understand that it's dodgy to do a 2 x 2 anova when the 4 resulting subgroups have...

• Replies: 0
• Views: 5,305
11-10-2009, 10:07 AM
35. ### problems proving the 4th moment for discrete, cont. cases

X is a random variable with moments, E, E, E, and so forth. Prove the following is true for i) X is discrete, ii) X is continuous E^4 = E(X^4) -...

• Replies: 8
• Views: 4,382
10-09-2011, 10:48 AM
36. ### Expected Value of normally distributed random variables

Given two independent random variables Y and W. Where Y is distributed as N(0,1) and W is distributed as N(0.100). a) Show that E = 1 and E = 0...

• Replies: 18
• Views: 9,712
11-03-2011, 08:06 PM
37. ### Derive Expected Value of Yhat

Yhat = 1/n Derive E(Yhat) and show that Var(Yhat) = ((1.25σ^2)/n) I don't know how to work with the constants to get the Expected Value and...

• Replies: 17
• Views: 8,346
BGM
11-06-2011, 05:50 AM
38. ### Sampling Estimates

Course: Sampling Methodology A university has 807 faculty members. For each faculty member, the number of refereed publications was recorded. This...

• Replies: 1
• Views: 5,668
01-23-2012, 07:50 PM
39. ### Find the required sample size

Given info: cost1=\$4, σ1=10, W1=N1/N=0.4 cost2=\$9, σ2=20, W2=N2/N=0.6 The first part of this question asks for the values of n1/n and n2/n that...

• Replies: 0
• Views: 1,231
02-04-2012, 08:35 PM
40. ### Find the required sample size

Stratified Sampling Question given info: cost1=\$4, σ1=10, W1=N1/N=0.4 cost2=\$9, σ2=20, W2=N2/N=0.6 The first part of this question asks for the...

• Replies: 0
• Views: 1,194
02-05-2012, 05:03 PM
41. ### Bias of the ratio estimator for pop. mean

I need to explain why the ratio estimator of the population mean is biased or unbiased. I am fairly certain that it is a biased estimator but I...

• Replies: 2
• Views: 2,123
03-04-2012, 10:32 PM

Hi. Cool forum btw - just what I need! :) I have agonised over this for while. I have two lots of questionnaire data - for one study this is...

• Replies: 9
• Views: 3,412
06-19-2006, 10:07 PM
43. ### Forget how to normalize to a range

I used to know how... I want to normalize a set of data to -2.5 to 2.5, but I only remember how to do between 0 and 1, any help or references would...

• Replies: 1
• Views: 1,541
01-26-2015, 08:17 AM
44. ### Non-normality persisting after various transformations

Hi, I am using SPSS18. I am comparing a psychological treatment (n=26) to a control (n=32), but at the moment I'm still doing data cleaning and...

• Replies: 9
• Views: 2,410
02-23-2012, 12:12 AM
45. ### Outliers and 5% trimmed means vs true mean

Hi, I have a few categorical (likert scale) variables that each have 1 univariate outlier (z-score > 2.88 two tailed). I am considering recoding...

• Replies: 6
• Views: 8,051
02-26-2012, 09:39 PM
46. ### Transformations - variables at different time points

Hi, I am going to be looking at variables (e.g. levels of depression) over different time points (T1-T2). If the variable for depression at T2 has...

• Replies: 1
• Views: 2,855
02-26-2012, 10:56 PM
47. ### Box's M not being shown

Hi, Does any one know what this error means in a Manova: "Box's Test of Equality of Covariance Matrices is not computed because there are fewer...

• Replies: 0
• Views: 1,608
03-29-2012, 07:32 PM
48. ### Comparing frequency data - repeated measures

Hi, I am using SPSS and wanting to compare post-test frequency data (frequency of dysfunction) to follow-up frequency data, for the treatment...

• Replies: 1
• Views: 5,155
07-31-2012, 07:49 PM
49. ### Can i do a t-test after Tukey post hoc?

Hello just wondering if this is acceptable or whether it's just gonna cause a type-1 error. I have used One-way ANOVA and then Tukey post hoc to...

• Replies: 8
• Views: 2,837
04-14-2013, 06:33 AM
50. ### Really Basic A level Statistics Test. (Multiple Choice)

1) ‘Cluster sampling’ is a term given to one method of (a) Selecting random numbers using excel (b) Probabilistic sample selection...

• Replies: 9
• Views: 6,339
03-08-2012, 04:01 AM
51. ### Binomial expectation E(X|X>1)

General case: X~B(n,p) I could integrate the product of x and pmf from 1 to infinity and divide it by the integral of just pmf from 1 to infinity...

• Replies: 1
• Views: 151
10-16-2017, 04:20 PM
52. ### Probability density function question

Hey, If someone can help me with the question im about to post i'll be very grateful. Even if its just the formulae. Question: Suppose the...

• Replies: 1
• Views: 5,739
04-24-2008, 02:15 PM
53. ### Bivariate Normal Distribution

Hello! I am trying to figure out how to prove that - given that (X1,X2) has a bivariate normal distribution and each is a standard normal...

• Replies: 3
• Views: 4,544
09-28-2010, 09:45 PM

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