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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: 68,389
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: 200,063
07-16-2014, 11:01 AM
1. Percentile rank

Can someone help me with the following problem? Thanks in advance ! :) Jon Molnar will graduate from Carolina Forest High School this year. He...

• Replies: 2
• Views: 8,163
08-23-2005, 11:16 PM
2. psyc stats

I cant seem to understand what these results are showing! The experiment was to test face recognition when the face is tilted a certain way ie yaw or...

• Replies: 2
• Views: 4,054
08-31-2005, 07:30 PM
3. Random sampling for quality determination

I have 20 tonnes of chocolate in 800 x 25kg cartons. How much chocolate from how many cartons must I sample to give me x% percent confidence that the...

• Replies: 1
• Views: 4,390
09-05-2005, 10:13 PM
4. Need Help w/ correlation test assume regression inferences are met. Work answer out

A grass seed company conducts a study to determine the relationship between the density of seeds planted (in pounds per 500 sq ft) and the quality of...

• Replies: 1
• Views: 7,496
09-08-2005, 11:09 AM
5. Correlation between two variable

If the correlation between to variable is -1.00, and the student got a score 1.3 standard deviation below the mean on the 1st variabe, what score...

• Replies: 1
• Views: 4,766
09-09-2005, 01:05 PM
6. Non-probability sampling stuff

Hi there, Sorry probably asking a very basic question but just want to make sure... Am I right in saying that if I have surveyed people using a...

• Replies: 3
• Views: 7,539
09-09-2005, 03:23 PM
7. mean aggression scores

Hi everyone, I was searching the web a few minutes ago and I discovered this webiste so I registered immediately. I have an assignment and I...

• Replies: 4
• Views: 4,760
09-11-2005, 10:40 PM
8. Setting Oridinals for Data

Can anyone advise me on the use of HIGH/MEDIUM/LOW/NON-USER ordinals against a numeric data set (sales marketshare percentages ranging from 0-78%)?...

• Replies: 1
• Views: 3,641
09-14-2005, 02:47 PM
9. Fault trees

Hi again, Can anyone share there opinion on the following: "In the case that a fault tree is influenced by common mode failures, is the...

• Replies: 1
• Views: 4,061
09-14-2005, 02:54 PM

2 questions.... 1. Suppose that the distribution of annual salaries for sales associates at this store is bell-shaped. Use the empirical rule to...

• Replies: 1
• Views: 6,481
09-18-2005, 11:37 PM
11. Hypothesis Testing

I have this homework problem that I need assistance with. A package-filling device is set to fill jars of jelly with a mean weight of 16 ounces of...

• Replies: 3
• Views: 3,584
09-22-2005, 01:16 PM
12. standard deviation

If you have a random sample of 100 in a population and it has some SD and then you do another sample, this time of 300, what happens to the SD, and...

• Replies: 6
• Views: 4,933
09-25-2005, 03:18 PM
13. Help with normal distribution

Hi All! I'm new to this forum and found it after spending 2 hours doing statistics homework. I'm trying to find an example, online, of the normal...

• Replies: 2
• Views: 3,954
09-26-2005, 12:00 PM
14. stats

ive posted a clearer message ahead

• Replies: 1
• Views: 3,295
09-26-2005, 12:48 PM
15. Statistics --- help

can some one describe how standard error of the mean differs for a population and for sample?

• Replies: 1
• Views: 3,698
09-26-2005, 04:46 PM

hi to all , please help in stas , iam so stuck withit. i have assignment , but only 1 questions i need your help: (briefly explain) Q1: one of the...

• Replies: 2
• Views: 5,307
09-29-2005, 06:43 AM
17. statistics

How and why does a one-tailed compared to a two-tailed test one affect the ability to identify significant differences?

• Replies: 2
• Views: 5,730
10-04-2005, 10:05 PM
18. Confidence Interval

what is the relationship between the confidence level and the size of the interval?

• Replies: 1
• Views: 3,729
10-04-2005, 10:31 PM
19. Help Me!!!!

I have a homework mini assignment and im finding statistics very hard! Can somebody please help me figure out what to use and why for the following...

• Replies: 6
• Views: 4,169
10-05-2005, 09:36 AM
20. Confused

I have no problems figuring out the normal distribution and z score for problems within the range but my teacher threw out a question with one out of...

• Replies: 2
• Views: 4,485
10-06-2005, 05:37 PM
21. Maximum Likelihood Estimate

I need to find the ML-estimate of theta. The likelihood function I got is To get the ML-estimate, I believe I need to simplify, take logs,...

• Replies: 4
• Views: 4,098
10-08-2005, 06:08 AM

:confused: I recently began this much dreaded course. I am having a difficult time grasping the concepts. I have an exam on Monday September 26,...

• Replies: 11
• Views: 6,385
10-08-2005, 06:15 AM
23. Distribution free confidence interval

How would I work out a distribution free 95% confidence interval of the median if given a large sample? To get the 95% CI I use \mbox{estimate}...

• Replies: 1
• Views: 4,678
10-08-2005, 09:09 AM
24. Probability of a Mailing Machine

I need some real serious help. This is the problem I need to finish. A technician services mailing machines at companies in the Phoenix area....

• Replies: 4
• Views: 10,532
10-09-2005, 05:53 PM
25. sample mean

The population of incomes in a particular community is thought to be highly right-skewed with a mean equal to \$36,789 and standard deviation equal to...

• Replies: 2
• Views: 4,861
10-09-2005, 06:38 PM
26. statistics

hi, i was wondering if it was better to use log-transformed data or untransformed data when making comparisons between two groups. also should we...

• Replies: 2
• Views: 3,140
10-11-2005, 06:55 PM
27. Computing Power

I know that power is one minus beta...but how do you calculate beta?

• Replies: 15
• Views: 7,524
10-12-2005, 11:25 PM
28. Z values

hey i was wondering when calculating proportions of a normal distribution and they ask you what is the probability of selecting something between 60...

• Replies: 2
• Views: 4,049
10-16-2005, 08:44 PM

• Replies: 1
• Views: 3,368
10-17-2005, 01:51 PM
30. ANOVA's

Is it possible for someone to tell me how to do them?

• Replies: 2
• Views: 3,495
10-17-2005, 09:48 PM
31. least squares method

Has anyone ever heard of using this?? It has to do with the regression equation... pllllllllease explain with lots of detail. statistics is not...

• Replies: 2
• Views: 3,904
10-20-2005, 03:02 AM
32. help

Honestly I have no idea how to do these I dont even know where to start please help In the past, of all the students enrolled in “Basic Business...

• Replies: 1
• Views: 4,351
10-20-2005, 03:37 PM
33. nonparametric stats

Hi, I'm a grad student reading up on nonparametric stats. I have a basic question. Are techniques such as local regression and smoothing splines...

• Replies: 2
• Views: 3,477
10-24-2005, 06:40 PM
34. hypothesis - need help

Where are the statical symbols to put in the problems?

• Replies: 3
• Views: 3,781
10-24-2005, 07:54 PM
35. regression

hi i have a doubt over something.. what is the standard error of the slope for regression and the standard error of the intercept. and what does...

• Replies: 1
• Views: 3,370
10-25-2005, 09:05 PM
36. HIGH LEVEL STATS:Can u help?

Hi, I am strugglig with some questions- I hope that someone will be able to help??? 1. Describe the relationship of the mEan, Median, and MOde to a...

• Replies: 2
• Views: 4,145
10-28-2005, 02:04 PM
37. Help- Am Lost!

if you can do this you are a star and better than me. have just finished 34 other questions and this one has stumped me totally! The set of scores...

• Replies: 1
• Views: 3,964
10-28-2005, 03:05 PM
38. approximation

Could someone tell me how iH was approximated from the equation at the top? Which approximation rule was used?

• Replies: 2
• Views: 3,155
10-30-2005, 09:29 AM

I need help with my statistics coursework and it has to be handed in 2morrow! i need to do spearmans rank of coefficient correlation on some data but...

• Replies: 1
• Views: 3,021
10-30-2005, 02:55 PM

This my first posting. The Bank wants to estimate the mean dollars that each card holder will spend each month. It would like to be within plus...

• Replies: 3
• Views: 4,482
10-30-2005, 06:52 PM
41. Determine Sample Size

I'm not sure what direction to go with this problem. I'm given 2 random samples: 1. 120 men, mean age 26.7, standard deviation 5.2yrs 2. 150...

• Replies: 2
• Views: 4,865
10-31-2005, 08:39 PM
42. it's me again, need some help, thanks

:D Ok. I think I have it, but my answer does not quite match up. ??? A RECENT POLL OF 700 PPL. WHO WORK INDOORS FOUND THAT 278 OF THEM SMOKE....

• Replies: 1
• Views: 9,264
11-01-2005, 09:56 PM
43. chi squared

I need to find the best type of analysis to compare whether people who say they would use a product are influenced by a characteristic. I have data...

• Replies: 2
• Views: 4,978
11-02-2005, 04:25 AM
44. Parsimonious regression model

Hi, I am trying to finish an assignment and I am stumped on one question. It is asking me to build a valid parsimonious regression model. What do...

• Replies: 1
• Views: 39,316
11-02-2005, 09:09 AM
45. Check my stats? How do I make a ratio that accommodates variability?

Hi, I'm a newbie which a problem:confused: I have two sets of data: A and B. Each is represented by a mean and a standard deviation. I want to...

• Replies: 3
• Views: 5,227
11-02-2005, 11:51 AM
46. I Need Help

All, I am struggling with Statistics in all areas. I'm great with numbers, however, I'm lost with this. Can someone help? Here are the following...

• Replies: 6
• Views: 10,630
11-03-2005, 12:41 PM
47. seems all too easy

:D okay, I have bought my 68 average in stats up to a 76, We are currently studying Confidence Interval stuff and hypothesis testing. The teacher...

• Replies: 1
• Views: 4,218
11-03-2005, 09:42 PM
48. What stats to use?

Hi everyone, iam doing a project on fish catches and i was wondering if there was any stats i could use. iam looking at catches (both net and rod)...

• Replies: 2
• Views: 3,314
11-04-2005, 11:46 AM
49. Help

My question is: Find the critical value Chi squared R corresponding to a sample size of 3 and a confidence level of 95 percent. I know that...

• Replies: 3
• Views: 9,693
11-04-2005, 05:25 PM
50. Continuous Probability Distribution

I tried reading and understanding continuous probabs distrib but i couldnt relate it to integration well pls can u help me right from the basics...

• Replies: 1
• Views: 3,862
11-05-2005, 02:37 PM
51. paired t-test assumptions

I know this test is used for two groups and involves a normally distributed, continuous variable--and it involves the difference in means. Does the...

• Replies: 5
• Views: 6,284
11-09-2005, 12:04 AM
52. confidence intervals

I have a question that is driving me up the wall. A sample of size 400 has a (sum)x = 30,430 and (sum)xsquared = 3,261,1000. construct a 95%...

• Replies: 4
• Views: 4,344
11-09-2005, 10:33 PM
53. help! null/alternative hypothesis?

QUESTION: If we are interested in testing whether the mean of population 1 is smaller than the mean of population 2 how would you state the null...

• Replies: 1
• Views: 6,302
11-10-2005, 11:08 PM
54. Regression question

I am just beginning to learn about regression and I have a couple of questions. What is the difference in the standardized regression coefficient...

• Replies: 2
• Views: 4,852
11-11-2005, 01:03 PM
55. election statistics question

looking at the new jersey 2005 election... i want to see if counties with a higher percentage of "over 65" people correlate to either a higher dem...

• Replies: 1
• Views: 4,161
11-11-2005, 01:14 PM
56. Continuous variables for correlations

Hello, I hope someone can help me with this question. If my variable is categorical (1=Sometimes, 2=Frequently ...) can I use it for in a...

• Replies: 2
• Views: 3,298
11-12-2005, 05:37 PM

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