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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: 196,748
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: 66,753
09-30-2005, 09:44 AM
1. ### Help with predicted value problem using regression equation

Use the computer display to answer the question. A collection of paired data consists of the number of years that students have studied Spanish and...

• Replies: 0
• Views: 10,845
11-13-2006, 03:00 PM
2. ### I need help!

this message has been deleted for his autor

• Replies: 0
• Views: 2,347
11-13-2006, 02:16 PM
3. ### Average of sample means

If random samples, each with n=100 scores, are selected from a normal population with mu=1000 and standard deviation=50, and the mean is calculate...

• Replies: 1
• Views: 3,344
11-13-2006, 12:39 AM
4. ### sample mean z-score

If a sample is selected from a normal population, then the probability that the sample mean will have a z-score less than z=2.55 is.......?

• Replies: 1
• Views: 8,280
11-13-2006, 12:35 AM
5. ### Please someone help me

4. A political strategist believes that 58% of voters in a certain state support his candidate. He then commissions a poll of 600 voters and 53% of...

• Replies: 2
• Views: 8,850
11-13-2006, 12:29 AM
6. ### Multicollinearity....

... ok, anyone's thoughts on this would be great. I have a result in which my two IV predictors cancel out an IV, DV relationship. Thanks to John for...

• Replies: 0
• Views: 3,145
11-11-2006, 04:57 PM
7. ### Skewness and Kurtosis

I have to 'show the standard error of the skewness and kurtosis as a footnote to a table' - any ideas on how this is expressed? I thought it might be...

• Replies: 2
• Views: 3,720
11-11-2006, 04:45 PM
8. ### Hypothesis Testing

Hi, New member here.:) I studied Maths and Further Maths at A Level but it's been 2 years now since i completed them so haven't done any Stats...

• Replies: 2
• Views: 1,918
11-10-2006, 06:49 PM
9. ### population sampling question

Hello I am having a difficulty with a homework problem from my basic statistics class. The problem: A weight loss trial involving a new diet is...

• Replies: 2
• Views: 2,267
11-10-2006, 02:38 PM
10. ### Might be a silly question about t-tests but...

...i really need some advice about how to go about comparing some means. Basically, I have the means and standard deviations for three different...

• Replies: 8
• Views: 3,047
11-10-2006, 01:33 PM
11. ### Clueless

I am in a really big fix. I have a midterm today and I just came back from a two week vacation to the Carribean...and I don't get the missed classes...

• Replies: 2
• Views: 1,837
11-10-2006, 09:27 AM
12. ### Help with hypothesis problem - Type I or Type II error

Please let me know if I did this problem correctly. Assme that a hypothesis test of the given claim will be conducted. Identify the type I or...

• Replies: 2
• Views: 6,708
11-09-2006, 12:36 PM
13. ### What is the best method to use?

Hello everyone, I am no stats expert and I am just in my second year at University. I am doing a project, and I was not sure what would be the best...

• Replies: 0
• Views: 2,699
11-09-2006, 11:31 AM
14. ### should I use an anova?

I have numbers of individuals in 3 groups (p, i and g) over 14 different tide heights. These tide heights have been grouped into Low, Mid and...

• Replies: 1
• Views: 1,956
11-09-2006, 09:12 AM
15. ### homework help

Hi everyone, I just discovered this forum today, and boy am I glad :) I'm in preparation for my final exam and I've just realised I don't know what...

• Replies: 4
• Views: 2,440
11-09-2006, 07:45 AM
16. ### Binomial Distribution & qa optimization

Hi I have a question I was hoping someone could help with relating to Binomial distribution and expected value. -- In a computer chip...

• Replies: 1
• Views: 3,126
11-08-2006, 05:17 PM
17. ### Repeated Measures ANOVA Question

Hi All, I've done a Repeated Measures ANOVA assessing mood during different kinds of weather. 5 subjects were asked to rate their mood on...

• Replies: 2
• Views: 3,818
11-08-2006, 04:47 PM
18. ### Help with P-value problem

I need help solving this problem Find the P-value for the indicated hypothesis test. An airline claims that the no-show rate for passengers booked...

• Replies: 1
• Views: 4,480
11-08-2006, 12:53 PM
19. ### Applying the Q test twice to the same data set (Why not?)

Hello Everyone. Scenario You apply the Q test to a data set and find that you may indeed remove a particular datum from the data set. ...

• Replies: 3
• Views: 2,699
11-08-2006, 12:28 AM
20. ### Null hypothesis problem

I need help with this problem. Not sure if I chose the right answer. Express the null hypothesis HO and the alternative hypothesis H1 in symbolic...

• Replies: 1
• Views: 5,241
11-07-2006, 05:38 PM
21. ### How to interprate type3 test with 0 df?

I got a problem to interpret these output. LR Statistics For Type 3 Analysis ...

• Replies: 0
• Views: 2,246
11-07-2006, 04:35 PM
22. ### Moved: Can you get me started?

• Replies: -
• Views: -
11-07-2006, 03:42 PM
23. ### some help with my stats module please!

would be grateful to anyone who could start me off here!! in a sociology survey, independent random samples of single partnered and...

• Replies: 2
• Views: 1,978
11-07-2006, 12:04 PM
24. ### Left-Tailed Hypothesis problem

I am having trouble solving this problem A manufacturer finds that in a random sample of 100 of its CD players, 96% have no defects. The...

• Replies: 2
• Views: 6,700
11-07-2006, 11:48 AM
25. ### joint prob. density func.

Let f(x,y) = 24xy for 0<=x<=1, 0<=y<=1, 0<= (x + y)<=1 = 0 otherwise. a. Verify that f(x,y) is a joint...

• Replies: 2
• Views: 2,693
11-07-2006, 01:30 AM
26. ### Population Mean problem

I am having trouble solving this problem Determine whether the given conditons justify testing a claim about a population mean. The sample size...

• Replies: 1
• Views: 4,988
11-07-2006, 12:30 AM
27. ### I need help, please:)

Okay so the problem is as follows : A study of children in Caithness,Scotland classified them according to hair color. This table reports...

• Replies: 1
• Views: 2,367
11-06-2006, 10:16 PM
28. ### I need help with interpretation of P-value please

Hello I need anyone who understands these things to help with interpretation of an output from minitab please. I am looking at whether results...

• Replies: 4
• Views: 4,914
11-06-2006, 05:03 PM
29. ### Experimental design...plz help !!

1) A corporation employs 2000 male and 500 female engineers. A stratified random sample of 200 male and 50 female engineers gives each engineer 1...

• Replies: 3
• Views: 9,245
11-05-2006, 11:32 PM
30. ### joint probability

Three marbles are chosen without replacement from a box containing 5 white and 7 blue marbles. Let Xi = 1 if the ith marble is white and xi = 0...

• Replies: 1
• Views: 4,384
11-05-2006, 06:19 PM
31. ### gamma distribution

Show that the sum of n independent identically distributed exponential random variables with parameter theta has a gamma distribution and give its...

• Replies: 1
• Views: 7,504
11-05-2006, 05:29 PM
32. ### Higher Order Factorial Designs

Hi There, I don't have a specific homework question. I was wondering, however, if any kind person could point me out to a website or book...

• Replies: 1
• Views: 4,075
11-04-2006, 07:48 AM
33. ### Moved: Spss Help!!!

• Replies: -
• Views: -
11-03-2006, 01:22 AM
34. ### Mean of random sampling

Hello there, I was wondering if someone could help me with a portion of my stats homework. Basically in part of the homework I had to take a...

• Replies: 2
• Views: 2,389
11-02-2006, 11:49 PM
35. ### Help with margin of error problem

I need help with this problem. I have been reading in my textbook but I still cannot figure it out. I have already figured out that 1.96 is the...

• Replies: 1
• Views: 5,163
11-02-2006, 10:59 AM
36. ### HELP! easy question, but im stuck

HELP!!! if the probability equals .03 that any randomly selected person from the general population has an IQ of 130 or above, what is the...

• Replies: 2
• Views: 3,227
11-01-2006, 10:11 PM
37. ### Hypothesis testing

I have an assignment due in a little while and I would like to double check my answers... it's basically true and false of m/c 1. The probability...

• Replies: 1
• Views: 3,564
11-01-2006, 07:55 PM
38. ### Age distribution between groups???

I am hoping to test whether there is a statistical difference between two groups of participants between the ages of 2-7. I know by looking at...

• Replies: 1
• Views: 2,482
11-01-2006, 07:50 PM
39. ### latent class

For a market research study I am using latent class. I want to find out what kind of things are important to different people. I will use regression....

• Replies: 1
• Views: 2,815
11-01-2006, 01:44 PM
40. ### Moved: Minitab?????

• Replies: -
• Views: -
10-31-2006, 12:39 PM
41. ### Question: Adjusting kappa for high absent ratings

I am calculating kappa on a scale for which several variables had high absent ratings. Can anyone shed some light on how to adjust kappa for high...

• Replies: 1
• Views: 1,966
10-30-2006, 05:17 PM
42. ### Expected Values HELP!

Here is the question: What is the expected value of a dollar bet? There are three wheels, each with 20 spaces. Reel one: 10 cherries, 6...

• Replies: 2
• Views: 2,775
10-30-2006, 03:07 PM
43. ### Do I use Binomdist?

If the manufacturer is allowed 2 footballs out of a random selected 10 to be more than X circumference. The manufacturer has found that 1 out of ten...

• Replies: 3
• Views: 2,218
10-30-2006, 11:51 AM
44. ### puzzled over which test to use

I have a number of hypotheses relating to temporal trends in wading bird diversity and abundance that need testing. Am I right in thinking that when...

• Replies: 2
• Views: 2,289
10-30-2006, 03:47 AM
45. ### Help in Generalized Slutsky

does anyone have any resources on the proof for the generalized slutsky theorem. Xn converges in dist to X, Yn converges in dist to c, then...

• Replies: 1
• Views: 2,729
10-29-2006, 03:11 PM
46. ### Determining if normal distribution

I am working on an assignment where I need to use either ANOVA or KRUSKAL_WALLIS testing. ANOVA assumes data with normal distribution...how do I...

• Replies: 1
• Views: 3,407
10-29-2006, 07:58 AM
47. ### How do you interpred the DS when p-value shows normality but skewness and kurtosis

How do you interpret the DS when p-value shows normality but skewness and kurtosis differ correspondingly from 0 and 3. Tzveta

• Replies: 1
• Views: 1,939
10-27-2006, 09:49 PM
48. ### Results of election

Hi, I just has a question in regards to what number to use for sample size.....I've showed my work below and just want someone to look over it ...

• Replies: 1
• Views: 2,261
10-27-2006, 05:15 PM
49. ### Help!!!

I am stuck for 2 hrs! please help!! I have a 2 by 4 design: amount of eating (independent variable, out of 100) on stress (low vs high) and time...

• Replies: 0
• Views: 2,029
10-27-2006, 12:35 AM
50. ### Stats help

Hi all, I have a question: If I have five groups, overall significant one-way Anova, and I want to examine all pairwise tests, considering both...

• Replies: 1
• Views: 2,554
10-26-2006, 11:55 PM
51. ### Null Hypothesis Significance Testing

Hi All, I am doing a question about NHST in my class, and I'm just stuck on one issue. I know what to do, but all of the data I'm working...

• Replies: 1
• Views: 2,645
10-26-2006, 08:44 PM
52. ### Discrete or Continuous?

On my homework the following problems were giving me trouble as to whether or not these are discrete or continuous? The number of tails that...

• Replies: 3
• Views: 3,622
10-26-2006, 11:16 AM
53. ### 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: 9,099
10-25-2006, 09:36 PM
54. ### 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: 2,157
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: 2,282
10-25-2006, 08:46 PM
56. ### 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: 4,988
10-25-2006, 08:44 PM
57. ### 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: 6,604
10-25-2006, 08:39 PM
58. ### 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: 3,027
10-24-2006, 06:31 PM
59. ### 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: 5,725
10-24-2006, 06:30 PM

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