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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: 196,753
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: 66,755
09-30-2005, 09:44 AM
1. ### Normal Distribution

I am stuck again on Question 7, it requires a look at question 2, therefore, I have included that portion with the answers. I have also submitted my...

• Replies: 3
• Views: 3,106
12-07-2005, 11:34 PM
2. ### jeepers

:wave: :shakehead okay I have some problems that i am going to try my best to let you see what work I did. Le me know if I am right or where I went...

• Replies: 1
• Views: 2,555
12-07-2005, 09:52 PM
3. ### Normal Distribution -Acceptable Pins

A company supplies pins in bulk to a customer. The company uses an automatic lathe to produce the pins. The machine are normally distributed with a...

• Replies: 1
• Views: 5,262
12-07-2005, 12:44 AM
4. ### Trend Analysis

What are the degrees of freedom in trend analysis? And what goes in the denominator? Does it matter what type of trend analysis you are doing, or...

• Replies: 4
• Views: 10,385
12-06-2005, 11:17 PM
5. ### Distribution of Estimators

What happens to sigma in when you have different distributions ? if Ri~G(u,sigma)....then what happens to sigma if (Summation Ri ) / n ? do you...

• Replies: 1
• Views: 3,526
12-06-2005, 04:41 PM
6. ### Prediction Intervals

Can someone help me with prediction intervals ? I dont get understand how you get the t-distrbution of (Y0 - U~) / (sigma * sqrt(1 +1/n)) where...

• Replies: 1
• Views: 3,995
12-06-2005, 03:08 PM
7. ### Stuck on a simple problem

The problem is as follows: The amount of money bob earns has an expected value of \$30,000 and a standard deviation of \$3000. The amount fo money...

• Replies: 3
• Views: 3,461
12-06-2005, 02:44 PM
8. ### Checking to see if i am correct

A roulette wheel has 18 numbers colred red, 18 colored black, and 2 (zero and double zero) that are uncolored. If you bet 1 unit on the outcome red,...

• Replies: 1
• Views: 3,724
12-06-2005, 01:46 PM
9. ### Need Help Asap!! (z-scores)

:eek: I am trying to figure out how to find the z-scores that separate the middle 88% of the data from the area in the tails of the standard normal...

• Replies: 2
• Views: 22,844
dml
12-06-2005, 12:05 AM
10. ### confidence interval

Hi, I am new to this and not quite sure what I am doing. I am hoping you will be able to help me with a few problems. I am not sure where to...

• Replies: 1
• Views: 3,703
12-05-2005, 10:14 PM
11. ### Confidence Intervals

Can anyone let me know if this sounds right. A scientist is researching a species of squid. A sample of 25 full grown squid is obtained and the...

• Replies: 1
• Views: 2,586
12-05-2005, 07:50 PM
12. ### Significance (t-statistic)

I'm not sure how to answer this one: Q: You are testing Ho: mu = 0 against Ha: mu (does not equal) 0 based on an SRS of 20 observations from a...

• Replies: 3
• Views: 9,402
12-04-2005, 10:22 PM
13. ### Inference about a Population Proportion - Margin of Error and Sample Size

Last one :) Q: An automobile manufacturer would like to know what proportion of its customers are not satisfied with the service provided by...

• Replies: 3
• Views: 11,484
12-04-2005, 10:20 PM
14. ### Two-Sample Interpretation of data

Ok this one if gonna be a little hard to copy from the book.... Q: A study of the self-concept of seventh-grade students asked if male and...

• Replies: 3
• Views: 8,572
12-04-2005, 10:18 PM
15. ### Two-sample t confidence interval

Am I correct??!! Corn yields (bushels per acre) for experimental plots controlled to have 1 weed per meter of row and 3 weeds per meter of row: ...

• Replies: 2
• Views: 7,532
12-04-2005, 12:26 PM
16. ### One-sample 't' statistic

I'm back :) This is my last stats assignment for this semester and I have a few questions that I'm not sure about. I'll post each one in a new...

• Replies: 1
• Views: 10,249
12-04-2005, 08:52 AM
17. ### interaction

Hi... I need some help with the basics... What is meant by an interaction in an experiment? And... Can you please tell me a link where I can find...

• Replies: 3
• Views: 3,071
12-04-2005, 05:59 AM
18. ### Misapplication of Hypothesis Testing?

I was asked the following question and would like to hear your view: "In the year 2005 National exam, 57.4% of the students who sat for the...

• Replies: 11
• Views: 4,053
12-01-2005, 09:15 PM
19. ### Hypothesis

HI, I have a question about null and alternate hypothesis. So basically the test is to see if we can reject the null (HO). I am not going to test...

• Replies: 3
• Views: 3,167
12-01-2005, 02:47 PM
20. ### The confidence interval

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

• Replies: 1
• Views: 2,526
11-30-2005, 08:42 PM
21. ### 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: 2,899
11-30-2005, 06:20 PM
22. ### 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: 8,688
11-29-2005, 10:11 PM

Hi... I am in a loop trying to describe the use of multiple factor designs in speech, hearing and language experiments. Does anybody know any...

• Replies: 2
• Views: 2,762
11-29-2005, 04:30 PM
24. ### Anova

Hi, i was having trouble calculating two-way ANOVA's.. i couldnt quite get the equations that my professor had posted can .. is there a website...

• Replies: 1
• Views: 2,497
11-29-2005, 02:29 PM
25. ### Sampling

Hi, I was looking at your examples for determining the minimum sample size required to estimate a population. Ok with Z^2, you put 1.96, and that is...

• Replies: 5
• Views: 3,348
11-28-2005, 01:20 PM
26. ### sampling distributions

i really need help in sampling distributions can you help ?

• Replies: 9
• Views: 3,778
11-27-2005, 11:38 PM
27. ### 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: 5,007
11-27-2005, 10:40 PM
28. ### 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: 5,149
11-27-2005, 10:11 PM
29. ### z test hypothesis

in z test hypothesis if we look something fewer than X%, do we use upper or lower tail test?

• Replies: 3
• Views: 4,746
11-27-2005, 07:53 PM
30. ### 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: 3,069
11-27-2005, 07:50 PM
31. ### Stats Help Needed

I've been going crazy with this problem, and I'm not sure if my solution for it is correct.. please help In a survey of 10,572 college students,...

• Replies: 1
• Views: 2,537
11-27-2005, 06:36 PM
32. ### 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: 3,781
11-27-2005, 06:24 PM
33. ### help with stats problem

This is the problem and I'm at a loss at what to do. I've tried a few things but feel like it's not correct. Can anyone help? Thanks! A...

• Replies: 1
• Views: 5,581
11-27-2005, 05:32 PM
34. ### statistics help needed.

Hey guys I've got several questions about statistics. Here's the first one. 1. Suppose X is a discrete random variable that takes on the three...

• Replies: 5
• Views: 3,195
11-26-2005, 02:56 PM
35. ### Probability: Is this right?

Ok..here's the question. The general manager of an amusement park wants to estimate the length of time people spend in the park. From the data...

• Replies: 2
• Views: 3,117
11-26-2005, 02:16 PM
36. ### 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: 3,674
11-26-2005, 12:08 AM
37. ### Ti-83 geometpdf question

Ok...here is the question from my review.... David is answering the telephone during a radio broadcast fund drive. People phone in pledges of \$5...

• Replies: 1
• Views: 5,879
11-25-2005, 02:25 PM
38. ### Sampling Distribution??

Ok...the question is... "Records at the College of Engineering show that 62% of all freshman who declare EE (electrical engineering) as their...

• Replies: 5
• Views: 4,067
11-24-2005, 10:14 PM
39. ### Dependent Sample Help

The question is asking the following: The two data sets are dependent. Find to the nearest tenth (one decimal place). A 64 53 57 63 51 B...

• Replies: 1
• Views: 4,719
11-24-2005, 10:43 AM
40. ### Standard Error

Below are two similar problems. For the question above I can do i and know how to do iii but don't see how to get the standard error of eta....

• Replies: 1
• Views: 2,669
11-24-2005, 05:54 AM
41. ### 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: 4,449
11-23-2005, 07:50 PM
42. ### A basketball team problem

• Replies: 1
• Views: 4,670
11-23-2005, 12:14 AM
43. ### Filling in ANOVA table

Below is a past exam question... Don't worry about i or ii because I can do them. r = 0.8 and 95% CI for rho is (0.71, 0.87), which is...

• Replies: 2
• Views: 12,737
11-22-2005, 11:17 PM
44. ### pls help

hi everyone i really really need help im soo behind on my stats work im relaly stuck on 2 assignments with a few questions left on both that i need...

• Replies: 1
• Views: 3,458
11-22-2005, 10:59 AM
45. ### statistics

what is the importance of statistics in business

• Replies: 1
• Views: 2,336
11-21-2005, 02:42 PM
46. ### Getting rid of transient state

Hi, I'm doing some simulations. I have some time series data. The thing is that, when I plot the moving average graph, there is a transient...

• Replies: 1
• Views: 2,594
11-21-2005, 08:11 AM
47. ### Help with Hypothesis Testing

:confused: Hello. Let me start off by saying Thank You :) for helping with people like me who are statistically challenged. I would like to think...

• Replies: 1
• Views: 3,234
11-20-2005, 09:34 AM
48. ### Help Again

If forgot, I had one more. I'm stuck on this equation too: A quadratic regression model is fit to a set of sample data consisting of 6 pairs of...

• Replies: 5
• Views: 3,374
11-19-2005, 10:56 PM
49. ### Help

I'm having a little trouble with the following question: Four pairs of data yield r = 0.942 and the regression equation (predicated value of y...

• Replies: 6
• Views: 7,989
11-19-2005, 10:10 PM
50. ### more Estimation....

This question asks for relative efficiency.. X and Y are random sample from a population with mean mu and variance sigma squared. (assume that X and...

• Replies: 1
• Views: 3,009
11-19-2005, 06:41 PM
51. ### Biased and Unbiased Estimators

Hi, I'm not sure how to find the bias estimator. For example, If we let X and Y be a random sample from a population with mean=1, compute the bias...

• Replies: 6
• Views: 6,006
11-19-2005, 06:27 PM

I am completely losttttttt & confused...I've tried to solve this with two different formulas. (smilpling distribution of mean of x1 - mean of x2)...

• Replies: 1
• Views: 2,756
11-19-2005, 03:05 PM
53. ### Simultaneous Hypothesis Tests

Hi, this is my first post here, so I hope this is the right place to write it. I was wondering how can I test these hypothesis simultaneously: ...

• Replies: 7
• Views: 3,970
11-18-2005, 07:49 PM
54. ### repeated measures

Which analysis is appropriate if you have repeated measures of continous explanatory variables and one measure of a continuous outcome variable?

• Replies: 3
• Views: 3,369
11-17-2005, 07:54 PM
55. ### Sequential tests and Type II error

I am performing a series of sequential hypothesis tests. I'm using the Bonferroni inequality, and a global alpha, to calculate alpha for each of the...

• Replies: 2
• Views: 2,816
11-16-2005, 11:48 PM
56. ### anova

can anova be used for for multiple comparisons? will it be significant? also is the dunnett test more powerful than the Tukey and Newman Keuls?...

• Replies: 1
• Views: 3,023
11-16-2005, 12:06 PM

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