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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: 66,955
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: 197,168
07-16-2014, 11:01 AM
1. Help

I need some assistance with the following 2 questions: Question 1: Assume that you want to test the claim that the paired sample data come from...

• Replies: 3
• Views: 5,191
11-27-2005, 10:11 PM
2. Help

This is the 2nd question: Construct a confidence interval for the mean of the differences d for the population of paired data. Assume that the...

• Replies: 1
• Views: 3,815
11-27-2005, 06:24 PM
3. Help

I too am having trouble with ANOVA. I have 2 questions that I need assistance with. Question 1: Test the claim that the samples come from...

• Replies: 3
• Views: 8,739
11-29-2005, 10:11 PM
4. help

I am having trouble with the folowing question: Use the Poisson Distribution to find the indicated probability. A computer salesman averages...

• Replies: 7
• Views: 4,686
12-09-2005, 04:03 PM
5. Thanks

I just wanted to say thank you to all of you who helped me with Statistics. I received an "F" on my midterm. However, by the time finals came...

• Replies: 1
• Views: 2,511
12-20-2005, 12:56 PM
6. Binomial Probability Distribution

In an experiment on ESP, a subject is asked to state the color (red or blue) of a card chosen from a deck of 25 cards. It is unknown how many red or...

• Replies: 0
• Views: 1,173
04-25-2013, 04:00 PM
7. Finding Bayes action

A woman must dcide between waxing her car (action a1) and not waxing her car (a2). She's concerned of the weather on whether it will be sunny (o1)...

• Replies: 1
• Views: 1,345
04-24-2013, 08:50 PM
8. Determining sample sizes - help much appreciated

Hi, I have 100 similar machines, each machine produces 650 products per week, which makes a total 65.000 products per week. I want to preform a...

• Replies: 0
• Views: 2,026
03-27-2009, 08:47 AM
9. Chi Square the right test?

Hi, I have 2 groups of data with yes and no answers at two different time frames. So for example.... Pre Post Group 1 Yes ...

• Replies: 2
• Views: 2,179
10-18-2011, 10:52 AM
10. What Test to Use? Survival...

Hi, I have 4 groups which each have a time to an event in months. I want to figure out if there is any significance between all 4 groups in the...

• Replies: 1
• Views: 1,903
10-19-2011, 02:46 AM
11. Deriving the variance of the sampling distribution.

Hi, I guess i am being stupid but i am a little stuck with part of the derivation of the variance of the sampling distribution of the mean. I...

• Replies: 1
• Views: 2,709
01-29-2013, 06:17 PM
12. Testing for difference between two percentages (using confidence intervals)

Hello, hopefully someone can help me with a question: I wish to test for whether the difference between 2 percentages is significantly different....

• Replies: 0
• Views: 1,945
06-14-2013, 09:43 AM
13. Conducting Factor Analysis on Data with Nominal, Ordinal, and Interval Data

I would advice on conducting a confirmatory factor analysis on data from an instrument that contains nominal, ordinal, and interval data. I'd think...

• Replies: 0
• Views: 1,966
04-29-2015, 12:07 PM
14. Sample Size hw question

The research team has considered your answers to the above. They’ve narrowed their interest to two outcomes (for now): Number of episodes of early...

• Replies: 0
• Views: 910
12-18-2015, 08:37 PM
15. Choosing the correct t-Test

Hi All: I am looking at health outcome data between hospitals. I measured mortality rate change at year 1, 2 and 3 after an education program...

• Replies: 3
• Views: 2,839
04-18-2012, 01:47 AM
16. Which correlation to use

Hi, I am trying to run a correlation. The independent variable is a survey score from 1 to 5. The dependent variable is a health outcome rate...

• Replies: 2
• Views: 1,744
04-18-2012, 08:24 AM
17. Confidence Interval for Population Mean

I am working on a statistics problem and want to make sure I am on the right track. Here is the problem: The following sample of 16 measurements...

• Replies: 6
• Views: 8,020
11-13-2010, 11:51 AM
18. Comparing z-values and t-values

Looking for some feedback as to whether I am on the right track for this problem: Suppose you have selected a random sample of n=7 measurements...

• Replies: 1
• Views: 13,597
11-15-2010, 01:22 PM
19. x-bar distribution

Question: Is the sampling distribution of x-bar always normally distributed, regardless of the size of the sample n? Answer: No Is this...

• Replies: 2
• Views: 10,368
11-19-2010, 04:30 PM
20. Rejection regions & Type 1 errors

Am I correct in using the formular 1-a to find the probability of a Type 1 error with a rejection region of z<-1.645 or z>1.645? I know the...

• Replies: 1
• Views: 5,418
12-03-2010, 06:30 PM
21. Expected Value of X

I'm asked to find the excpected value of x-bar, but I'm not sure what method to use here. The information I have: According to AAA, the average cost...

• Replies: 1
• Views: 9,716
11-22-2006, 11:27 AM
22. Uniforming data to produce better graph

Hello, forum! This is my first post here and I really hope someone can help me. I have to draw a graph of two very long columns of data. Both...

• Replies: 0
• Views: 1,186
03-07-2015, 02:42 PM
23. need help with problem

problem with Poisson distribution, please help The number of dirt specks on a randomly selected square yard of polyethylene film of a certain...

• Replies: 0
• Views: 1,439
09-09-2013, 12:16 PM
24. Determining sample size for my research

I am designing a study that looks at rates of colonization with a certain bacteria species among healthcare workers. Basically, we would be testing...

• Replies: 1
• Views: 1,169
08-18-2014, 11:38 AM
25. Unsure about the range(s) to use for double integration

f(x,y)=c(x+y); 3<x<7, 2<y<4, x>y i am supposed to find the value of c. i know i have to integrate the double integration of f(x,y) and then...

• Replies: 1
• Views: 1,805
10-17-2016, 06:32 AM
26. Finding Confidence level if given confidence interval?

Here is the problem... Suppose a random sample of size 81 from a normal population with known standard deviation = 40 produced (60,80) as a...

• Replies: 2
• Views: 1,932
04-16-2013, 11:11 AM
27. How to compare two regression lines?

Hi, I'm trying to find out if Pearson and Spearman correlations are equally suited for my data. I've computed some Pearson and Spearman correlations...

• Replies: 0
• Views: 2,183
5''
12-22-2012, 05:20 PM
28. Calculating with types of data

Why can't one compute with values such as 'M(ale)/F(emale)'? Can't I keep a counter of how many males and females were at an event? Am I not...

• Replies: 0
• Views: 882
04-28-2013, 09:35 AM
29. Probability of an event

A woman bears two babies and they both die. The case goes into court and they hire a statistician to figure out what the chance is of a woman...

• Replies: 1
• Views: 939
04-28-2013, 05:20 AM
30. Cumulative relative frequencies

I have a problem I do not understand. I always end up with result 0.99 instead of 1. See lines 22 and 40: http://pastebin.com/hVcLbVAW Am I not...

• Replies: 0
• Views: 1,092
04-29-2013, 02:26 PM
31. How to compute the threshold in BML with dynamic SGM?

Hi I have a few questions regarding statistics and image processing. I'm trying to implement a skin recogniser, to determine if a given texel is...

• Replies: 0
• Views: 2,611
04-08-2010, 05:22 AM
32. How to transform a vector that generates the best multivariate Gaussian pdf?

Hi I have a true positive (TP) and a false positive (FP) 3-vector sample set. From these I want to create two multivariate Gaussian pdf’s, for...

• Replies: 0
• Views: 2,129
04-15-2010, 10:30 AM
33. Book recomendation for IT engineer?

Hi I don't remember much of the sparse amount of statistic education we had at uni. In my work as an engineer I have come across quite a bit of...

• Replies: 2
• Views: 2,661
04-25-2010, 03:24 PM
34. How can I figure out the raw score of this data set?

I must find the raw scores, z-scores, T-scores, and percentile ranks. Note: the Mean = 50, SD = 5. Raw z ...

• Replies: 1
• Views: 1,974
06-11-2015, 07:32 AM

I have 3 regression models; my error/constant values are 3***, 1.2 and 3.4***. My question is: since the 1.2 is insignificant (so this model...

• Replies: 0
• Views: 2,260
04-20-2010, 10:19 AM
36. existence of unbiased estimator of absolute value of mean

Does anyone see or have the proof of the following : "There is no unbiased estimator of the absolute value of mean in Normal(myu, 1)" Just...

• Replies: 1
• Views: 5,314
03-17-2009, 10:02 PM
37. Interpretation of 99% confidence interval

Hello guys, this is my first post here in the forum and if I missed anything, then pls correct me. My first statistic class starts this week...

• Replies: 8
• Views: 1,440
09-06-2016, 04:09 PM
38. How to derive R-squared from correlation coefficient?

• Replies: 1
• Views: 2,329
09-20-2014, 10:39 PM
39. Does the difference between males and females between two groups of species differ?

Background I have body weight measures from seven rodent species in both northern and southern Europe. For each of the total 14 species, I have...

• Replies: 6
• Views: 1,193
10-28-2016, 01:51 AM
40. dependent normal distribution

I am given: 1) Y11,...,Y1n are dependent 2) Y1j follows n(theta1,sigma^2), j=1,...,n 3) corr(Y1j,Y1j')=p>0, j not equal to j' How can I find...

• Replies: 3
• Views: 2,003
BGM
12-06-2011, 05:07 AM
41. Which test to carry out SPSS

Ive done a questionaire and i want to analyise if there is anything correlation between having seen the algore film and some ones view on climate...

• Replies: 4
• Views: 4,899
10-24-2010, 05:49 PM
42. explain why... negative becomes positive

im doing a study on lung cancer associated with air pollution when i iduvidually correlated ethnicity with SMR rate of lung cancer it gives a...

• Replies: 3
• Views: 3,631
10-26-2010, 04:09 AM
43. easy question, if your not as thick as me!

(this is in a lineear regression model) If i square the standardized coefecient number of all the varaibles then multiply to give me the...

• Replies: 1
• Views: 2,199
10-26-2010, 04:55 PM
44. What type of graph would i use?

Sorry if this is the wrong section first of all, Basically i have for each year how many tonnes of carbon the accumlative nuclear power points...

• Replies: 3
• Views: 2,516
03-18-2011, 02:51 PM
45. What sort of data is this? In a pickle

Hi, sorry first of all if is could be suited more towards a different catagory. Basically ive done questionaire and one question is : 3....

• Replies: 13
• Views: 2,838
11-10-2011, 06:50 PM
46. Is this ordinal?

Hi, My question in a survey is "What do you belive the general view of experts is regarding the causes of Climate change" and the answer...

• Replies: 3
• Views: 2,863
11-11-2011, 03:37 PM
47. What test to use?

I hope you can help I want to compare education level which consists of 5 catagories: None, GCSE, Alevels, Degree, Postgrad As each one is...

• Replies: 3
• Views: 1,579
11-16-2011, 10:02 AM
48. What sampling method is this?

Hi, I hope you can help. I collected my samples on the street by just asking passers by to fill in my questionnaire. I moved to 5 different...

• Replies: 4
• Views: 2,157
01-03-2012, 10:41 AM
49. Need a couple examples to get me going in the right direction...

The outside diameter of a part used in a gear assembly is known to be normally distrubuted with a mean of 40mm and standard deviation of 2.5mm. the...

• Replies: 1
• Views: 2,440
02-04-2013, 12:20 AM
50. Is this a completely randomized design?

Hello everyone, I am wanting to make sure that what I have is a completely randomized design. This is not homework, but rather thesis research. It...

• Replies: 0
• Views: 1,059
03-12-2017, 09:06 PM
51. election question

heyy ive done most of the homework from this weeks h/w from school but im having problems with this question; ive got a quizz next monday and i...

• Replies: 0
• Views: 2,964
05-27-2008, 05:14 PM
52. May need some help!

Hello, I am new to this forum and i was wondering if i could get some help with a few problems i cannot crack. Racking my brain on them. Thank you,...

• Replies: 1
• Views: 1,827
04-27-2009, 04:24 PM
53. power analysis- interpreting sample size given established literature

Hello and thank you for clicking, I am attempting to use relevant effects size from a published study to obtain a suggested sample size for my...

• Replies: 3
• Views: 1,224
02-25-2015, 05:25 PM
54. Theory testing

Hi guys (First Post, woop!) Im currently attempting to draft a PhD proposal investigating the role of optimism in Seligman's Well Being Theory but...

• Replies: 9
• Views: 1,883
03-06-2012, 02:06 PM
55. Exponential Family-Example

I have the following question. Does anybody know an example where the MLE is biased for an exponential family distribution, i.e. ...

• Replies: 1
• Views: 1,161
10-07-2014, 10:55 AM

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