Statistics Full Review

Front

What is correlation in statistics?

Back

Correlation is a statistical measure that describes the extent to which two variables change together. A positive correlation means that as one variable increases, the other also increases, while a negative correlation means that as one variable increases, the other decreases.

Front

What does a strong positive correlation indicate?

Back

A strong positive correlation indicates that there is a strong relationship between two variables, where both variables tend to increase together.

Front

What is a correlation coefficient?

Back

A correlation coefficient is a numerical value that ranges from -1 to 1, indicating the strength and direction of a linear relationship between two variables.

Front

What does a correlation coefficient of 0.905 suggest?

Back

A correlation coefficient of 0.905 suggests a very strong positive correlation between the two variables.

Front

What is a scatter plot?

Back

A scatter plot is a graphical representation of two variables, where each point represents an observation. It helps to visualize the relationship between the variables.

Front

What does it mean if a scatter plot shows no correlation?

Back

If a scatter plot shows no correlation, it means that there is no discernible relationship between the two variables; changes in one variable do not predict changes in the other.

Front

How do you calculate the percentage of a group?

Back

To calculate the percentage of a group, divide the part by the whole and multiply by 100. For example, if 43.75% of females chose soccer, it means that out of 100 females, approximately 44 chose soccer.

Front

What is the total number of individuals surveyed if 22 have no cell phone?

Back

The total number of individuals surveyed can be inferred from the context of the question, but if only 22 have no cell phone, it indicates that this is a specific subset of the total.

Front

What is the importance of sample size in surveys?

Back

Sample size is important in surveys because a larger sample size generally leads to more reliable and valid results, reducing the margin of error.

Front

What does it mean if 43.75% of females chose soccer as their favorite sport?

Back

It means that out of all the females surveyed, 43.75% indicated that soccer is their favorite sport, which can be used to understand preferences within the group.