Two Population CI and ST for Means and Proportions

Front

What is a 2 sample t-test for mean?

Back

A statistical test used to compare the means of two independent groups to determine if they are significantly different from each other.

Front

When should you use a 2-proportion z-test?

Back

When comparing the proportions of two independent groups to see if there is a significant difference between them.

Front

What does a p-value represent in hypothesis testing?

Back

The probability of obtaining test results at least as extreme as the observed results, assuming that the null hypothesis is true.

Front

What is a confidence interval?

Back

A range of values derived from sample data that is likely to contain the true population parameter with a specified level of confidence.

Front

What does a 98% confidence interval indicate?

Back

We can be 98% confident that the true population parameter lies within the interval.

Front

What is the null hypothesis in hypothesis testing?

Back

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

Front

What is the alternative hypothesis?

Back

The hypothesis that there is an effect or a difference, opposing the null hypothesis.

Front

What is the significance level (alpha)?

Back

The threshold for determining whether to reject the null hypothesis, commonly set at 0.05 or 0.01.

Front

What does it mean if a p-value is less than the significance level?

Back

It indicates that the null hypothesis can be rejected, suggesting that there is a statistically significant effect or difference.

Front

What is the difference between a one-tailed and a two-tailed test?

Back

A one-tailed test checks for an effect in one direction, while a two-tailed test checks for effects in both directions.