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In This Topic
Confidence interval
Formula
Notation
| Term | Description |
|---|---|
 | sample mean |
| zα/2 | inverse cumulative probability of the standard normal distribution at 1- α /2; α = 1 - confidence level/100 |
| σ | population standard deviation (assumed known) |
| n | sample size |
Z-value
Formula
Notation
| Term | Description |
|---|---|
 | sample mean |
| μ0 | hypothesized population mean |
| σ | population standard deviation (assumed known) |
| n | sample size |
P-value
The calculation for the p-value depends on the alternative hypothesis.
| Alternative Hypothesis | P-value |
|---|---|
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Notation
| Term | Description |
|---|---|
| μ | population mean |
| μ0 | hypothesized population mean |
| z | z-value of the sample data |
| Z | a random variable from the standard normal distribution |
