Assume the null hypothesis states that the mean is at most...

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Key Concepts

One-Tailed Test

A one-tailed test is used when the alternative hypothesis specifies a direction of the effect (either an increase or a decrease relative to a hypothesized value). In such tests, the critical region for rejection of the null hypothesis is located entirely in one tail of the probability distribution.

Null and Alternative Hypotheses

The null hypothesis represents a default assumption about a population parameter, and the alternative hypothesis suggests a deviation from this default. The structure of these hypotheses determines the direction of the test — whether it assesses an increase, decrease, or simply any difference from a hypothesized value.

Hypothesis Testing

Hypothesis testing is a method used to decide whether there is enough statistical evidence in a sample to infer that a certain condition holds for the entire population. It involves setting up a null hypothesis and an alternative hypothesis and determining which hypothesis is better supported by the sample data.

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