# ANOVA vs 2 sample t-test

N

#### noko1100

Hi, I hope someone can help me with my doubts.

I am confused regarding the use of these tools. I have read a lot info on internet ,

I know that:

2 sample T test help you to Compare two samples with each other

My doubt is that some websites says that you can use the ANOVA instead of 2 sample T test to compare two samples with each other

is this correct?

regards

Last edited by a moderator:

#### Bev D

##### Heretical Statistician
Staff member
Super Moderator
Yes you can use ANOVA for comparing the means of two samples. You can also use ANOM (Analysis of Means), confidence intervals as well as Tukey Duckworth Endcount approach. There are many statistical tests for comparing the difference in means...each has its own strengths and weaknesses...

Last edited:
N

#### noko1100

Yes you can use ANOVA for comparing the means of two samples. You can also use ANOM (Analysis of Means), confidence intervals as well as Tukey Duckworth Endcount approach. There are many statistical tests for comparing the difference in means...each has its own strengths and weaknesses...

I would not want to take advantage of your help but which would be fundament for using two instead of three samples with the ANOVA

Minitab requires minimun 3 samples for the ANOVA

Last edited by a moderator:

#### Miner

##### Forum Moderator
Staff member
No, Minitab does not require three. Attached is the Minitab Furnace.MTW data set analyzed both as a 2-sample t-test and as a 1-way ANOVA. Notice that the conclusion is the same for both methods.

#### Attachments

• 81.4 KB Views: 278

#### Bev D

##### Heretical Statistician
Staff member
Super Moderator
Minitab requires minimun 3 samples for the ANOVA
Are you referring to '3' levels of a factor (example 3 different process settings for temperature or 3 different vendors for some material)
OR
a sample size of 3 (data points) for each level of a factor?

I am not familiar with Minitab - but Miner is and I trust his answer regarding the ability of Minitab to perform ANOVA on 2 levels of a factor (a "two-sample" test)

#### Statistical Steven

##### Statistician
Staff member
Super Moderator
No, Minitab does not require three. Attached is the Minitab Furnace.MTW data set analyzed both as a 2-sample t-test and as a 1-way ANOVA. Notice that the conclusion is the same for both methods.
Just a point of clarification, the p-value will be IDENTICAL if you assumed equal variance. The difference in p-values in the assumption of unequal variance for the two-sample t-test.

V Sample Range for a valid GRR using ANOVA in Minitab Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 2
C Sample Size of GR&R (Gage R&R) on Nested Anova Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 4
B Destructive Gauge R&R Sample Sizes - Does ANOVA work better for the analysis? Inspection, Prints (Drawings), Testing, Sampling and Related Topics 4
R Squared Values in One-Way ANOVA Statistical Analysis Tools, Techniques and SPC 2
Minitab 19 Anova or X bar # of distinct catagories Using Minitab Software 1
% Tolerance - Type 1 study on the gages, then a gage R&R (ANOVA) Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 4
E Input to ANOVA 1-WAY - How can I perform this analysis in minitab? Using Minitab Software 2
Which Anova dropdown to use for R&R in Minitab? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
B WEDM Taguchi and Anova Analysis - L16 array with 5 parameters at 4 levels Manufacturing and Related Processes 5
F How to make an ANOVA of a design with repeats (not replicates) in Minitab? Using Minitab Software 18
G ANOVA GR&R: Minitab vs AIAG MSA results Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 7
H Taguchi mixed model DoE [L16 (4^3 2^6): factors interaction and ANOVA calculation Using Minitab Software 3
S Taguchi Design with ANOVA - 3 factors each with 3 levels Quality Assurance and Compliance Software Tools and Solutions 13
B How to perform a MSA - GRR (Gage R&R) A&R/ANOVA Vs GUM/VDA Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
E GR&R ANOVA 3rd Factor for Fixture Nests Using Minitab Software 3
F Help me understand the ANOVA Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
F Post Hoc test for two way ANOVA Using Minitab Software 9
E ANOVA for Taguchi method - Four factors and three levels and nine runs (Minitab) Using Minitab Software 6
M ANOVA for S/N ratio gives different results Statistical Analysis Tools, Techniques and SPC 5
T Minitab Two-way Anova example (EXH_AOV.MTB) Quality Assurance and Compliance Software Tools and Solutions 1
S ANOVA/Regression - Analyzing a Dataset which contains over 4500 Points Using Minitab Software 3
P Taguchi Anova Error with Minitab Using Minitab Software 9
J Why doesn't ANOVA Method take the specification into account when determining GR&R % Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 11
F Fully nested ANOVA: A missing p-values (Minitab) Using Minitab Software 11
S Regression Analysis / ANOVA using Excel Excel .xls Spreadsheet Templates and Tools 2
C GR&R MSA-4 ANOVA Excel Template Verification Check wanted Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 5
R P-value and interpretation of ANOVA Gage R & R Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 11
What is the the difference between the Gage R&R Nested Anova and ISO/REMCO N263? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
S ANOVA and Test Method Validation for a Drug Delivery Device Statistical Analysis Tools, Techniques and SPC 4
L How is the interaction physically happening while performing ANOVA GR&R? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
E Using ANOVA during the PQ Validation Run to evaluate Statistical Differences Statistical Analysis Tools, Techniques and SPC 4
M Understanding of Regression and ANOVA in Minitab Statistical Analysis Tools, Techniques and SPC 8
J Minitab Error - * ERROR * Unbalanced Design - Unbalanced Anova Using Minitab Software 9
S Anova Gage R&R Calculations for 4 Operators Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 2
M Multi-factor Anova with Minitab Using Minitab Software 1
R New to MSA - I was told to use ANOVA for the GRR's Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 2
G GR&R (Gage R&R) Anova versus Xbar Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 4
S Strange PT Ratio on an Excel spreadsheet for variable GRR ANOVA Method Excel .xls Spreadsheet Templates and Tools 2
J Variation (using ANOVA method) Required for Gage R&R Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 3
A Minitab ANOVA Error Message - *ERROR* No data in column. Using Minitab Software 3
Choosing the alpha level in an ANOVA Study Statistical Analysis Tools, Techniques and SPC 3
I Minitab ANOVA Gage R&R Error (vs. EXCEL ANOVA GRR Calculation) Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 5
P Multi-factor Anova with Minitab Using Minitab Software 11
V Identifying Significant Factors - Regression Analysis vs Correlation vs ANOVA vs DOE Quality Tools, Improvement and Analysis 7
GRR (Gage R&R) Nested Anova Method Example Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 40
L Good Excel .xls sheet for Gage R&R that calculates both Anova and Range Excel .xls Spreadsheet Templates and Tools 9
Generic question regarding Two Way ANOVA Results Statistical Analysis Tools, Techniques and SPC 8
D ANOVA vs. X bar & R - MSA Study in Mintab - Which to use and why? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
Two Way ANOVA Test For Equal Variances Using Minitab Software 10
K Error in ANOVA table in the AIAG MSA manual? Table A4 Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 6