Z-Tests and Hypothesis Testing

These flashcards cover essential vocabulary and definitions related to Z-Tests and hypothesis testing.

Critical Regions

Areas associated with alpha where if the P-Value falls within, we reject H0.

One-tailed Distribution

A distribution where the critical region is in one tail, usually the last 5%.

Two-tailed Distribution

A distribution where the critical regions are in both extremes, with 2.5% on each side.

Z-Crit

The critical z-score associated with alpha, used for comparison with Z-Obt.

Alpha

The threshold for significance, commonly set at 0.05.

Z-Obt

The calculated z-score from the sample data.

Statistically Significant

A result is considered statistically significant if H0 is rejected, indicating that results are unlikely due to chance.

When to use Z-Tests

Use Z-Tests when variables are interval or ratio scale, randomly selected, population distribution is normal, and population mean and standard deviation are known.

Reject H0

To dismiss the null hypothesis when Z-Obt surpasses Z-Crit.

Retain H0

To not reject the null hypothesis when Z-Obt does not surpass Z-Crit.