J
JasonAREdwards
Minitab Sample Size Calculation: 1 Sample t vs Minimum Sample Size for Means:
I am wondering if someone can help me out with some confusion that I have over sample size calculations.
1. Why is the sample size to calculate means so much smaller than the sample necessary to know if my mean is on target (i.e. a 1 sample t test; my mean is what it is)?
2. When using Minitab sample size estimator, it asks about confidence level, but it does not ask about power?
Using Minitab sample size estimator to calculate means I enter the following:
Standard Deviation: 0.069151
Estimate sample size
Margin of error 0.02
Minitab indicates that the sample size is 49
- What is the Power for this conclusion?
Using Minitab power and sample size for 1 sample t I enter the following:
Difference 0.02
Power Value: 0.9
Standard Deviation: 0.069151
Minitab indicates that the sample size is 128
Thank you in advance!
I am wondering if someone can help me out with some confusion that I have over sample size calculations.
1. Why is the sample size to calculate means so much smaller than the sample necessary to know if my mean is on target (i.e. a 1 sample t test; my mean is what it is)?
2. When using Minitab sample size estimator, it asks about confidence level, but it does not ask about power?
Using Minitab sample size estimator to calculate means I enter the following:
Standard Deviation: 0.069151
Estimate sample size
Margin of error 0.02
Minitab indicates that the sample size is 49
- What is the Power for this conclusion?
Using Minitab power and sample size for 1 sample t I enter the following:
Difference 0.02
Power Value: 0.9
Standard Deviation: 0.069151
Minitab indicates that the sample size is 128
Thank you in advance!