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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: 196,675
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: 66,697
09-30-2005, 09:44 AM
1. ### Confidence Interval for a Company's Rate

I know that a 95% CI is one interval in a set of intervals where 95% of the intervals contain the population parameter. If the population paramter...

• Replies: 2
• Views: 2,121
03-08-2010, 03:30 AM
2. ### confidence interval for a population proportion

Hi All, My question is this: I'm trying to get confidence intervals around the means of the proportion of survey respondents that chose a...

• Replies: 2
• Views: 1,784
10-12-2013, 03:33 PM
3. ### Confidence Interval for a Proportion of a Population

I was hoping someone could help me out with a problem based on an audit performed where I work. To provide some context, we are required to audit...

• Replies: 0
• Views: 952
02-25-2013, 03:52 PM
4. ### Confidence interval for a simple survey result

I recently surveyed 200 organisations to establish a number of key facts about them including the number of staff. 160 of them responded with the...

• Replies: 0
• Views: 1,054
10-27-2014, 10:07 AM
5. ### Confidence Interval for binary data

If I want to calculate the 99% confidence interval for binary data. For example lets say I asked 500 people if they had ever done a bungee jump? ...

• Replies: 0
• Views: 2,245
02-01-2015, 02:48 PM
6. ### Confidence interval for Cohen's H

hi everyone, I would like to create a Forest plot for a number of studies that looked at proportions. I calculated effect sizes using Cohen's H, but...

• Replies: 0
• Views: 945
07-08-2016, 09:36 AM
7. ### Confidence Interval for Correlation

Suppose I take two entities – A and B. For these two, I have measured a particular characteristic for each of years 2006, 2007, 2008, 2009, and...

• Replies: 2
• Views: 3,495
11-25-2010, 09:48 AM
8. ### confidence interval for covariance estimation

Is it possible to calculate the confidence interval for the sample covariance estimation of two random variables? The two random variables can be...

• Replies: 4
• Views: 8,869
06-01-2010, 01:56 PM
9. ### Confidence interval for difference between means- equal and unequal variances

I was working on a problem where the instructor said to use the same values to determine confidence intervals for equal and unequal variances...

• Replies: 0
• Views: 2,210
06-17-2012, 02:50 PM
10. ### confidence interval for g(r), radial distribution function/ pair correlation function

I am determining g(r) (aka a pair correlation function for two independent groups, where r is the radius between objects in the groups) for real...

• Replies: 0
• Views: 1,803
07-12-2012, 11:41 PM
11. ### Confidence interval for Kendall's Tau-C

Hi, I am conducting a Kendall's Tau-C correlation test (in SPSS), and I was wondering if there is any software or instructions on how to create a...

• Replies: 2
• Views: 5,308
09-15-2014, 07:17 PM
12. ### confidence interval for mean

Hello all, I have a basic question. I want to calculate a confidence interval for the population mean. I know that the population is normal, and I...

• Replies: 1
• Views: 917
12-31-2013, 03:46 PM
13. ### Confidence Interval for mean

Hello in a statistical problem, the population standard deviation was given to be 3 and the sample size is 49. in the problem i was asked to use 99%...

• Replies: 1
• Views: 1,220
06-29-2016, 09:31 PM
14. ### confidence interval for mean difference vs. hypothesis testing

Hello, I am trying to solve a simple question in hypothesis testing and confidence interval, and something doesn't seem right. I have an...

• Replies: 6
• Views: 2,185
06-06-2013, 09:32 AM
15. ### Confidence interval for median

Hi I have a question about Wilcoxon-Moses confidence interval for median technique. The problem is with ties in my sample. It means I have counts...

• Replies: 0
• Views: 3,384
04-18-2010, 08:48 AM
16. ### Confidence interval for median

The question is: A traffic warden notes the time cars have been illegally parked after their metered time has expired. For 16 offending cars...

• Replies: 9
• Views: 28,525
10-12-2010, 09:58 AM
17. ### Confidence interval for point estimate

Lets say I have weights of 30 random children age 10 in a village. We can assume that these weights follow a normal distibution and can estimate the...

• Replies: 2
• Views: 1,507
06-30-2014, 12:11 PM
18. ### Confidence interval for pooled variance of multiple populations?

Given: -10 data sets from different populations -20 measurements per data set -Each data set has a statistically different mean -The variance...

• Replies: 1
• Views: 1,621
BGM
01-23-2015, 06:21 AM
19. ### 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: 7,983
11-13-2010, 11:51 AM
20. ### Confidence Interval for Sample and T-Test

For the sake of illustration, I am using a caliper mounted in stand A and measuring a part 20 times. This gives me a mean of 2mm and a 99% CI of...

• Replies: 7
• Views: 1,823
11-24-2014, 02:57 PM
21. ### Confidence Interval for the Difference Between Two Means

Hello, I test the hypothesis of the difference between two normally distributed population means with unknown population variances. The test is...

• Replies: 1
• Views: 4,210
05-18-2011, 09:15 PM
22. ### Confidence interval for the standard deviation

Hi, I'm using the typical formula SQRT(((N-1)*s^2)/(CHISQ.INV((1-Confidence)/2, N-1))). By mistake I entered a very low confidence and I noticed...

• Replies: 1
• Views: 939
04-04-2017, 12:28 PM
23. ### confidence interval for total weight.

Hi, I´m struggling a bit with an example and I hope someone can guide me a little, I´m working on the following example: I buy 200 gold coins,...

• Replies: 2
• Views: 4,808
10-11-2009, 08:54 PM
24. ### Confidence interval for unknown probability

Suppose I have a black box with one button and one light. There is a fixed, but unknown, probability, P, that the light will come one whenever the...

• Replies: 6
• Views: 1,132
03-03-2016, 04:17 PM
25. ### confidence interval for variance

Samples X1..Xn ~N(u, sigma_squared) and Y1..Ym ~N(u, 4sigma_squared), where population mean is known. Can anyone give me suggestions to calculate...

• Replies: 0
• Views: 2,235
02-04-2008, 12:37 PM
26. ### Confidence Interval Gamma Dist

Does anyone knows the equation for the Confidence Interval of a Gamma Distribution?

• Replies: 2
• Views: 6,623
02-16-2009, 01:20 PM
27. ### Confidence Interval Help

A usrvey of 49 randomly selected banks in New York revealed that these banks required average down payments of 35% of the purchase price of the home...

• Replies: 2
• Views: 2,611
04-25-2006, 08:52 AM
28. ### Confidence Interval Help

I am really stumped on this one: In a sample of 400 seeds, 240 germinated. Estimate the true germination rate with a 90% and 99% confidence...

• Replies: 1
• Views: 2,625
07-13-2006, 04:03 PM
29. ### Confidence Interval Help

I don't get it Population: Women - 800 Men - 1,000 Avg retirement Age: Women - 62.7 Men - 62.2 Standard Deviaition

• Replies: 0
• Views: 5,451
11-18-2006, 07:20 AM
30. ### Confidence Interval Help

Hello :) I have a question in my homework that states: "Lorraine computed a confidence interval for μ based on a sample size of 41. Since she...

• Replies: 3
• Views: 8,863
04-16-2014, 03:11 PM
31. ### Confidence Interval help

I am an engineering student working on some research and I am having some trouble constructing a confidence interval. I have various mechanical...

• Replies: 0
• Views: 945
07-23-2014, 01:34 PM
32. ### Confidence interval help needed

Hey guys, Its been a while since I did a CI so I am a bit rusty. I had 19 steel pins which all had an actual diameter of .375 in, so mean is...

• Replies: 4
• Views: 2,080
09-17-2014, 06:58 AM
33. ### Confidence Interval help.

I have a few of these types of hw problems and can't remember the calculator function to be used. here is an example: The average size of a farm...

• Replies: 2
• Views: 3,035
04-07-2008, 09:01 AM
34. ### Confidence Interval homework help

This is the only part of our homework I am not understanding... A.)If the 95% confidence interval for the population mean is (6,20), what is the...

• Replies: 4
• Views: 1,531
05-04-2015, 04:47 PM

how do i interpret a 95% confidence interval which is presented in percentages with no standard deviations. (this is for a medical essay) two...

• Replies: 14
• Views: 1,993
03-21-2014, 03:18 AM
36. ### Confidence interval of a mean difference

Hi all, can someone refresh me on the process to do the following. Based on data that was published in a thesis: A within subjects...

• Replies: 2
• Views: 1,102
01-23-2016, 02:38 PM
37. ### Confidence Interval of a Population

I am supposed to be finding the confidence interval for P(X=1) = EX = unemployment rate. I have X = 1 if unemployed, 0 if employed. Y = 1 if no...

• Replies: 0
• Views: 1,258
10-10-2012, 08:37 PM
38. ### Confidence interval of density distribution

Hi, I am a university student and I have a trouble with the following example. This is not what I am actually confronting, but I think it will make...

• Replies: 3
• Views: 2,606
01-13-2017, 01:46 AM
39. ### Confidence interval of log-linear regression with offset

Daer all, I have a set of data, as shown below. Using Excel, I can plot the data set using the first column as X and the second column as Y. Both...

• Replies: 0
• Views: 2,341
09-05-2012, 04:56 AM
40. ### Confidence interval of mean of queue length (M/M/1)

Goodday, For a simulation course I had to simulate a single server queue with Poisson processes for arrival and departure (M/M/1). Now, this...

• Replies: 3
• Views: 2,388
09-06-2014, 09:09 AM
41. ### Confidence Interval of Multiple Regression

Hi Stupid question but I'm trying to work out a confidence interval estimate for the mean response. The formula I have in front of me is the...

• Replies: 4
• Views: 18,909
08-11-2012, 12:44 PM
42. ### Confidence Interval Of Regression Line

I'll be honest with all of you, this is my first time here and I've taken Stats online which was a bad idea because my teacher got really busy and...

• Replies: 2
• Views: 2,019
06-09-2012, 02:07 PM
43. ### Confidence interval of the estimated p-value

When I calculate the p-value of a test (say, a two-sample pooled t-test), that p-value is a statistic, and the value is a point estimate of that...

• Replies: 4
• Views: 3,718
12-08-2010, 03:18 PM
44. ### confidence interval of the mean difference

hello every one, what if the confidence interval of the mean difference contain zero, but P is less than .05. can i still interpretate the result...

• Replies: 0
• Views: 2,131
10-14-2010, 12:01 AM
45. ### Confidence Interval on Estimated Data

Problem How do I account for the error in my initial estimate on this problem? Background I need to know when a case is two standard deviations...

• Replies: 0
• Views: 2,318
04-17-2009, 09:30 AM
46. ### confidence interval plus some

Hi I'm working on a question that asks me to find the constant c so that c(Xbar-X(n+1))/S has a t distribution. We're given that X1, X2, ......Xn,...

• Replies: 5
• Views: 2,228
03-08-2006, 07:45 PM
47. ### Confidence Interval Problem

Problem: A careful study of the cause of failure of a large batch of computers showed that 30% of failures could be traced to power supply...

• Replies: 4
• Views: 2,908
07-19-2007, 11:27 AM
48. ### confidence interval problem

i have a confidence interval problem that i have done and just looking for confirmation that it is correct: in a random sample of 50 bicycle...

• Replies: 0
• Views: 2,517
03-10-2009, 03:04 PM
49. ### Confidence Interval problem

Hello all, I need some help with the following question. Any assistance would be greatly appreciated. The Crossett Trucking Company claims...

• Replies: 1
• Views: 11,689
12-08-2009, 03:46 AM
50. ### Confidence Interval Problem

Hi all, I hope you guys can provide me some direction here. I'm a having some trouble with the following problem (use of excel allowed -- and...

• Replies: 3
• Views: 3,649
01-12-2010, 01:21 AM
51. ### Confidence Interval Problem

Assume that you have a 95% confidence interval for a population mean based on a sample size of n1 = 50. If you wish to have a confidence interval of...

• Replies: 0
• Views: 2,231
03-14-2016, 05:41 PM
52. ### Confidence Interval Problem #2

The Human Resources Department of a large corporation wanted to determine if a majority of its employees were satisfied with their treatment by the...

• Replies: 2
• Views: 3,333
07-19-2007, 11:28 AM
53. ### Confidence Interval Problem, and more

sorry, deleted.

• Replies: 0
• Views: 2,331
07-18-2007, 02:37 PM
54. ### Confidence Interval Problems (unknown S.D.)

Problem 1: {Exercise 8.17} The International Air Transport Association surveys business travelers to develop quality ratings for transatlantic...

• Replies: 0
• Views: 10,924
11-21-2007, 08:11 PM
55. ### Confidence Interval Question

I have to find a 90% confidence interval for a mean, and i'm only given the S and the x-bar for a sample population of 60. How do I find the t* for...

• Replies: 1
• Views: 4,156
01-28-2007, 02:27 PM

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