z or chi-squared inference

Front

What is the chi-squared statistic used for?

Back

The chi-squared statistic is used to assess how expectations compare to actual observed data, particularly in categorical data analysis.

Front

What does a large component in a chi-squared test indicate?

Back

A large component indicates that the observed frequency in that category is significantly different from the expected frequency.

Front

What is the null hypothesis (Ho) in hypothesis testing?

Back

The null hypothesis (Ho) is a statement that there is no effect or no difference, and it serves as the default assumption to be tested.

Front

What is the alternative hypothesis (Ha) in hypothesis testing?

Back

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

Front

What is a one-tailed test?

Back

A one-tailed test is a hypothesis test that evaluates the possibility of the relationship in one direction (either greater than or less than a certain value).

Front

What is a two-proportion z-test used for?

Back

A two-proportion z-test is used to compare the proportions of two independent groups to determine if there is a significant difference between them.

Front

What is a one-proportion z-test used for?

Back

A one-proportion z-test is used to determine if the proportion of a single sample is significantly different from a known proportion.

Front

What is the expected count in a chi-squared test?

Back

The expected count is the frequency that would be expected in a category if the null hypothesis were true.

Front

How do you calculate the expected count for a category in a chi-squared test?

Back

Expected count = (Row total * Column total) / Grand total.

Front

What does it mean if a chi-squared test result is statistically significant?

Back

It means that the observed data significantly deviates from what was expected under the null hypothesis, leading to its rejection.