NULL AND ALTERNATIVE HYPOTHESIS

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What is a null hypothesis?

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A null hypothesis (H0) is a statement that there is no effect or no difference, and it serves as a default or starting assumption in statistical testing.

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What is an alternative hypothesis?

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An alternative hypothesis (H1 or Ha) is a statement that indicates the presence of an effect or a difference, opposing the null hypothesis.

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How is the null hypothesis denoted?

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The null hypothesis is denoted by H0.

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How is the alternative hypothesis denoted?

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The alternative hypothesis is denoted by H1 or Ha.

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What does it mean if the null hypothesis is rejected?

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If the null hypothesis is rejected, it suggests that there is sufficient evidence to support the alternative hypothesis.

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What does it mean if the null hypothesis is not rejected?

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If the null hypothesis is not rejected, it suggests that there is not enough evidence to support the alternative hypothesis.

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What is a one-tailed test?

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A one-tailed test is a statistical test that evaluates the direction of the effect, either greater than or less than a certain value.

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What is a two-tailed test?

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A two-tailed test is a statistical test that evaluates whether a parameter is significantly different from a specified value, without specifying a direction.

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Provide an example of a null hypothesis.

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Example: H0: The average height of students in a class is 160 cm.

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Provide an example of an alternative hypothesis.

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Example: H1: The average height of students in a class is not 160 cm.