Statistics longtest for Finals

Front

What is a t-test?

Back

A statistical test used to compare the means of two groups, especially when the sample size is small and the population standard deviation is unknown.

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What is a z-test?

Back

A statistical test used to determine if there is a significant difference between the means of two groups when the sample size is large and the population standard deviation is known.

Front

What does a correlation coefficient of +1 indicate?

Back

A perfect positive linear relationship between two variables.

Front

What is a parameter in statistics?

Back

A numerical value that summarizes a characteristic of a population, such as the population mean.

Front

What is a statistic in statistics?

Back

A numerical value that summarizes a characteristic of a sample, such as the sample mean.

Front

What is the null hypothesis (H0)?

Back

A statement that there is no effect or no difference, and it is the hypothesis that researchers aim to test.

Front

What is the alternative hypothesis (Ha)?

Back

A statement that indicates the presence of an effect or a difference, opposing the null hypothesis.

Front

What is a left-tailed test?

Back

A hypothesis test where the critical region is in the left tail of the distribution, used to determine if a sample mean is significantly less than the population mean.

Front

What does it mean to reject the null hypothesis?

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It means that there is sufficient evidence to support the alternative hypothesis.

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What does it mean to not reject the null hypothesis?

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It means that there is not enough evidence to support the alternative hypothesis.