Fall24 Final Exam Review

A z-score indicates how many standard deviations an element is from the mean. It is calculated using the formula: z = (x - µ) / σ.

To calculate a z-score, subtract the mean (µ) from the value (x) and then divide by the standard deviation (σ). Formula: z = (x - µ) / σ.

A stratified sample is a sampling method where the population is divided into subgroups (strata) that share similar characteristics, and samples are taken from each stratum.

Stratified sampling aims to ensure that specific subgroups are adequately represented in the sample, improving the accuracy of the results.

It means that the predicted height is based on statistical models and may not reflect the actual height of an individual, which can vary.

A bar chart is a graphical representation of data where individual bars represent different categories, making it easy to compare quantities.

To interpret a bar chart, look at the height of the bars to compare the values of different categories. The taller the bar, the greater the value.

The weakest association refers to the least correlation or relationship between two variables, indicating that changes in one variable do not significantly affect the other.

A simple random sample is a sampling method where every individual in the population has an equal chance of being selected.

A systematic sample is a sampling method where you select every nth individual from a list of the population.