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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: 196,759
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: 66,758
09-30-2005, 09:44 AM
1. ### What would you classify an "operational decision" for a DC?

You run a distribution center that distributes different brands of cell phones to retailers in the area. You need to tackle inventory decisions that...

• Replies: 2
• Views: 1,643
03-17-2016, 02:26 PM
2. ### Unique Solution.

Is the following statement true that : "To get unique solution of each parameter in a model, number of equations must be greater than or equal to...

• Replies: 1
• Views: 1,293
03-17-2016, 02:13 AM
3. ### t-test:is it worth using if sample size is very small and results are very different?

Dear all, As part of a lab practical, I am comparing nitrite concentration in two different samples (sample 1 and 2). I only have three data for...

• Replies: 3
• Views: 1,970
03-16-2016, 11:44 AM
4. ### Which t test?

I have 5 machines that each produced 100 cars. I have data showing how long each toy car lasted. We think one machine is malfunctioning. I need to...

• Replies: 1
• Views: 1,729
03-16-2016, 06:53 AM
5. ### recoding a sequence in SPSS

I have a sequence of numbers: 10001 01 10002 01 10003 01 10004 01 10001 02 10002 02 10003 02 10004 02 10001 03 10002 03

• Replies: 0
• Views: 1,401
03-16-2016, 05:12 AM
6. ### T/Bond rate worst case scenario at 95% confidence Interval

I have past one year t/bond rates separately for tenors 1 year,2 year and 3 year. Now I want to calculate worst case scenario ( worst rate...

• Replies: 0
• Views: 1,210
03-16-2016, 03:40 AM
7. ### Finding correlation between orders (DV) and price (IV), with many other IVs at play

I have a large data set of several million customer orders for a product, over the past two years. Orders have grown steadily over that period (with...

• Replies: 0
• Views: 1,336
03-15-2016, 10:59 PM
8. ### How do I normalize the variance of error terms in multinomal logit/probit models?

Hi, I use a multinomial logit model to analyze a choice experiment with three options. I normalize the coefficient of one of the options, say option...

• Replies: 0
• Views: 884
03-15-2016, 12:11 PM
9. ### Calculating Cohen's d with alternative information

I am trying to calculate the effect size from three different articles using Cohen's d. The first was straight forward - they provided the group...

• Replies: 0
• Views: 1,282
03-15-2016, 09:24 AM
10. ### Intro Stats Books- How valid and representative of real world applications?

I have an Intro Statistics book by Neil Weiss 9th edition. It is a pretty informative book that covers the basics as would any Intro Stats book....

• Replies: 2
• Views: 1,455
03-15-2016, 09:16 AM
11. ### Which type of statistical test to use?

Hi i am seeking help on which type of statistical test i need to use here. I gather it is an ANOVA but what kind of ANOVA would it be? THANKS IN...

• Replies: 1
• Views: 2,088
03-15-2016, 09:14 AM
12. ### Need help with complex sample size calculation

What sample size (n) is required to identify a "significant" correlation between k binomial variables (predictors) and another binomial variable...

• Replies: 0
• Views: 1,607
03-15-2016, 05:44 AM
13. ### Sampling issue

I want to be able to make comparisons between a specifically selected sample (based on ethnicity) and a randomnly selected sample from the general...

• Replies: 0
• Views: 1,467
03-14-2016, 06:50 PM
14. ### Find Correlations

Let's say I have some samples, that I gathered per second, like these Number km Benzine Speed Weight 1 10 100 80 100...

• Replies: 0
• Views: 1,682
03-14-2016, 05:44 PM
15. ### 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: 2,243
03-14-2016, 05:41 PM
16. ### Using The Pearson Correlation Coefficient on a Time Series

Hi everybody, I have a question about using the Pearson Correlation Coefficient on a time series. The time series has 23,000 data points. I...

• Replies: 2
• Views: 1,849
03-14-2016, 01:45 PM
17. ### Variance main effect influencing interaction effect

Does variance of one of the two main effects in a 2-way (ANOVA) interaction influence the significance of the interaction effect? Two analyses are...

• Replies: 0
• Views: 1,820
03-14-2016, 09:17 AM
18. ### Can't Figure this Out

4. Suppose public opinion is split 65% against and 35% for increasing taxes to help balance the federal budget. Suppose also that 500 people from the...

• Replies: 1
• Views: 2,415
03-13-2016, 07:53 PM
19. ### Need help with some Statistics Questions

1. For a car traveling 60 kilometers per hour (km/h), the distance required to brake to a stop is normally distributed, with mean of 17 meters and a...

• Replies: 0
• Views: 2,976
03-13-2016, 05:57 PM
20. ### Relationship between effect size, sample size and p-value?

Is there a simple formula that links effect size, sample size and p-value? Specifically, how does the p-value depend on effect size and sample...

• Replies: 8
• Views: 4,863
03-13-2016, 03:24 PM
21. ### The brand of light bulb you use at home...

The brand of light bulb you use at home has an average life of 900 hours. A manufacturer claims that its new brand of bulbs, which cost the same as...

• Replies: 5
• Views: 1,788
03-13-2016, 02:52 PM
22. ### Cumulative risk calculation

Hi Guys I recently attended a lecture where the presenter stated that: "The risk of having a stroke for this particular person in year 1 is...

• Replies: 3
• Views: 1,605
03-12-2016, 03:25 PM
23. ### sampling question.

I was given this question and I'm looking for an answer. The question is.. "The client of an email process has specified that the % of A or B...

• Replies: 1
• Views: 1,179
03-12-2016, 09:38 AM
24. ### Ordinal logistic regression vs linear regression?

Hi Guys, just wondering if I could have your help pls. I have a sample size of 55 patients (of which 22 were subsequently diagnosed with Heart...

• Replies: 5
• Views: 2,072
03-12-2016, 08:08 AM
25. ### What does this mean?

the ratio of the square of the correlation of the "estimated y" values to the square of the correlation of the "observed y" values Could square of...

• Replies: 2
• Views: 1,853
03-12-2016, 07:18 AM
26. ### the significance level of the test...

2. Let X be a Bin(100,p). To test H0 : p = 0.08 against H1 = p < 0.08, we reject H0 if and only if X <= 6. a. Determine the significance level of...

• Replies: 0
• Views: 1,481
03-12-2016, 04:01 AM
27. ### [SPSS] comparing a value over time: how to analyze the trend?

Hello everyone, I'm trying to understand how to analyze a trend in the correct way. I've seen a lot of videos/tutorials and read some books but I...

• Replies: 2
• Views: 1,708
03-12-2016, 03:44 AM
28. ### Mixed model analysis

I would greatly appreciate any help constructing a model to analyze the variation in strontium-to-carbon ratios in 204 fish otoliths (1 otolith per...

• Replies: 0
• Views: 907
03-11-2016, 06:32 PM
29. ### Which statistical test to use?

Hi, I'm struggling with the following; I have two dependent variables (A and B) which are continous and highly correlated with each other...

• Replies: 2
• Views: 1,564
03-11-2016, 10:35 AM
30. ### R^2 definition (HW question)

Please weigh in on the accuracy of this definition: The coefficient of determination describes the percentage of the total variation that is...

• Replies: 0
• Views: 1,112
03-11-2016, 09:27 AM
31. ### Basic question on dealing with nominal IVs

Hi all Let's imagine we have 3 columns: Country (with 30 levels, but entirely nominal), GDP (continuous) and voter turnout (continuous) How...

• Replies: 3
• Views: 1,898
03-11-2016, 06:16 AM
32. ### Statistical analysis help

So I am working on the analysis of this experiment and I am trying to see what is the best statistical analysis method to use ( t-test, ANOVA, ......

• Replies: 0
• Views: 1,089
03-10-2016, 03:12 PM
33. ### Estimate individual variance from pool variance

Let's say I have a group of 100 tiny beads, and I want to know the variance in their weight. However, my scale can't weigh one bead at a time, so I...

• Replies: 7
• Views: 1,654
03-10-2016, 01:11 PM
34. ### Behavioral statistics for radial 8 arm maze

I am having trouble looking for the right statistical test. My experiment: Rats (n=20) RAM (radial 8 arm maze): in each entrance a pad with...

• Replies: 0
• Views: 1,256
03-10-2016, 09:41 AM
35. ### Multivariate statistics - Using adonis to compare assemblages

Hi I am looking at the difference in assemblage colonisation on two artificial settlement tiles (plastic and slate) and the data has been recorded...

• Replies: 0
• Views: 1,228
saz
03-10-2016, 08:44 AM
36. ### Sample Distribution Probability (unsure if correct answer)

1. Carlinville, Illinois, has just started an ambitious recycling program. Special trucks collect recyclable products once a week, sorted into...

• Replies: 0
• Views: 2,161
03-09-2016, 06:45 PM
37. ### Std. Error Multiple Regression Question

Hi guys, I'm stuck at interpreting the stadard error. In single regression it's clear, it's just the average distance from the line. But I don't...

• Replies: 4
• Views: 1,707
03-09-2016, 02:48 PM
38. ### N trials, 3 possible outcomes

I have n independent trials, where the result of each trial is either A, B or C, with probabilities a, b and c respectively, so that a + b + c = 1. ...

• Replies: 8
• Views: 1,349
03-09-2016, 12:37 PM
39. ### Goodness-of-fit test

I have a question regarding goodness-of-fit tests. A general rule of thumb with the chi-square test of goodness of fit is that (1) no more than 20%...

• Replies: 6
• Views: 2,002
03-08-2016, 05:03 PM
40. ### unbiased estimator assumptions

Are all of these assuptions required for the least square estimator of slope to be unbiased? 1) errors are normally distributed 2) errors have...

• Replies: 6
• Views: 2,518
03-08-2016, 03:34 PM
41. ### Statistical difference between two means

I have observations in my study on setback distances for wind turbines. I have the mean value for two setback distances, one close and one further...

• Replies: 2
• Views: 1,330
03-08-2016, 12:16 PM
42. ### [SOLVED] t test advice. Anyone able to help me a little here?

Hi there everyone, I'm a diagnostic radiography student, currently working on a research proposal and to be honest, I'm having an absolute...

• Replies: 1
• Views: 1,857
03-07-2016, 03:54 PM
43. ### A study was carried out to investigate whether the type of milk used is the same ....

A study was carried out to investigate whether the type of milk used is the same among young people as among older ones. A sample of 500 people...

• Replies: 4
• Views: 1,668
03-07-2016, 02:35 PM
44. ### Choosing the Correct Analysis - Comparing Categorical Independent Variables (STATA)

So I want to compare the rates of infection in patients who received drugs A, B, C, and D. Patients could have received one, two, three, or all four...

• Replies: 0
• Views: 857
03-07-2016, 01:51 PM
45. ### Directional Test Help

Directional test (H1:M<μ) – In the city there is normally a mean of 75 parking tickets issued per officer with a standard deviation of 12. The...

• Replies: 1
• Views: 1,050
03-07-2016, 01:43 PM
46. ### Am I using the right model and how to deal with missing values in a SPSS GLMM

Dear all, I hope I will find somebody here who can help me a bit with my SPSS problems. I have a relatively complex dataset that comes from an...

• Replies: 0
• Views: 1,283
03-07-2016, 11:27 AM
47. ### Proportional Sampling

I have 30 people in a sample. In group A there are 20 people and in group B there are 10 people. I need to sample 20 people without replacement. ...

• Replies: 0
• Views: 662
03-07-2016, 09:18 AM
48. ### Comparing mortality rates? 2-sample t-test vs Chi sq vs Poisson regression vs others

Hi there, Sorry for my ignorance but been a while since I did stats. I am comparing mortality rates between two breeds of pigs. My ultimate...

• Replies: 1
• Views: 1,535
03-07-2016, 07:17 AM
49. ### Cox regression with varying data completion

Gentlemen Many thanks for providing a fantastic resource in many previous projects, I have often found very helpful answers to simple questions...

• Replies: 0
• Views: 1,139
03-07-2016, 05:25 AM
50. ### How many tickets were sold ?

Suppose raffle tickets were sold for a charitable fundraising. The responsible organization sold many tickets, but you had no idea what was the...

• Replies: 0
• Views: 1,201
03-07-2016, 02:00 AM
51. ### Distribution normality test

Dear friends, please assist. I have data set (sales) and before treating it as normal distributed data for my homework I need to test it for...

• Replies: 3
• Views: 1,969
03-06-2016, 05:38 PM
52. ### Standard errors from non-random samples

I've been analyzing an insurance claims database from a non-random convenience sample of claims from individuals with employer-sponsored insurance...

• Replies: 2
• Views: 1,252
03-06-2016, 11:34 AM
53. ### Continous-probability function, cumulative

Hello again, second time posting here now, tried my luck once and you guys were very helpful so i will try again: The first is concerning the...

• Replies: 2
• Views: 1,142
03-06-2016, 02:46 AM
54. ### Do percentile rankings from a weighted average have identical distributions?

I was wondering if you could help me figure this out. I'm at a school that determines class rank for a year by a percent rank of scores determined by...

• Replies: 0
• Views: 1,190
03-05-2016, 09:06 PM
55. ### Bootstrapping with One-way ANOVA design and confidence interval

Hello, I am new to this forum, and I need some helps in bootstrapping. I am using Matlab. So, here's the study design: I have three groups...

• Replies: 2
• Views: 3,291
03-04-2016, 07:43 PM
56. ### What Test To Use?

Hi guys, I am totally stuck trying to perform statistical tests for my project and was wondering if somebody could help? Basically, I distributed...

• Replies: 2
• Views: 1,742
03-04-2016, 12:19 PM

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