Two–Sample Z–Interval

Menu name

Z–INT: ∝1– ∝2

 

 

 

This option uses the Normal Z–distribution to calculate a

 

confidence interval for the difference between the means of

 

two populations, ∝1 – ∝2, when the population standard

 

deviations, σ1 and σ2, are known.

Inputs

The inputs are:

 

 

 

 

 

 

 

Field name

Definition

 

 

 

 

 

x1

Sample 1 mean.

 

x2

Sample 2 mean.

 

n1

Sample 1 size.

 

n2

Sample 2 size.

 

σ1

Population 1 standard deviation.

 

σ2

Population 2 standard deviation.

 

C

Confidence level.

Results

 

 

 

The results are:

 

 

 

 

 

 

 

Result

Description

 

 

 

 

 

 

Critical Z

Critical value for Z.

 

 

∝ Min

Lower bound for ∝1 – ∝2.

 

 

∝ Max

Upper bound for ∝1 – ∝2.

 

 

 

 

 

Inference aplet

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