# One-sided tests have been proposed for such circumstances.

A one-sided alternative hypothesis (also known as a directional hypothesis) can be used because the researcher is specifically hypothesizing that scores for trained students are greater than the national average.

## A one-sided test puts all of the probability into a single tail.

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### {-}\$ from the one-sided Kolmogorov-Smirnov Test?

In this case, we would say we’ve performed a one-sided test, because we determined in advance that only values greater than 0.5 would cause us to reject the null hypothesis.

### Note: If you had been testing the two-sided alternative,

In the output above, Minitab reports that the P-value is 0.158. Since the P-value, 0.158, is greater than α = 0.05, the quality control specialist fails to reject the null hypothesis. There is insufficient evidence, at the α = 0.05 level, to conclude that the mean thickness of all pieces of spearmint gum differs from 7.5 one-hundredths of an inch.

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## What's the null hypothesis in a one-sided Kolmogorov-Smirnov test

The null hypothesis of equal effectiveness is The alternative hypothsis states that the difference can be in only one direction For example, an investigator might propose using a one-tailed test to test the efficacy of a cholesterol lowering drug because the drug cannot raise cholesterol.

## Hypothesis Testing – One Tailed Tests Examples (Null …

With a one-tailed test, the hypothesis of no difference is rejected if and only if the subjects taking the drug have cholesterol levels significantly lower than those of controls.

## DEFINITION One sided alternative hypothesis and two sided ..

The p-value as or more extreme by chance alone if your null hypothesis is true. This p-value is determined based on the result of your test statistic. Your conclusions about the hypothesis are based on your p-value and your significance level.

### One can never prove the truth of a statistical (null) hypothesis.

The engineer entered his data into Minitab and requested that the "one-sample t-test" be conducted for the above hypotheses. He obtained the following output:

### One tail test at ALPHA = .01, therefore Z = 2.33.

The biologist entered her data into Minitab and requested that the "one-sample t-test" be conducted for the above hypotheses. She obtained the following output:

### Alternative names are one-sided and two ..

In this case, the difference scores di = x2i - x1i can be computed and a one-sample test performed using thenull hypothesis that the mean of the difference is not significantly different than zero:

The alternative hypothesis is

Example: A sample of houses is chosen.