MA 251 UNIT 1 A Review #1

Front

What are quantitative variables?

Back

Quantitative variables are numerical values that represent measurable quantities, such as height, weight, or age.

Front

What is an observational unit?

Back

An observational unit is the entity or item from which data is collected in a study, such as a granola bar or a grocery store.

Front

What is the mean in statistics?

Back

The mean is the average of a set of numbers, calculated by dividing the sum of all values by the number of values.

Front

What is variance?

Back

Variance is a measure of how much values in a data set differ from the mean, calculated as the average of the squared differences from the mean.

Front

What is the standard deviation?

Back

Standard deviation is the square root of the variance and indicates the amount of variation or dispersion in a set of values.

Front

What is the median?

Back

The median is the middle value in a data set when the values are arranged in ascending order.

Front

What is the interquartile range (IQR)?

Back

The IQR is the difference between the first quartile (Q1) and the third quartile (Q3) and measures the spread of the middle 50% of the data.

Front

What does it mean if the mean is greater than the median?

Back

If the mean is greater than the median, the data distribution is likely right-skewed, indicating that there are higher values pulling the mean up.

Front

What is a five-number summary?

Back

A five-number summary includes the minimum, first quartile (Q1), median, third quartile (Q3), and maximum of a data set.

Front

How do you calculate the lower fence in the Outlier Test?

Back

The lower fence is calculated as Q1 - 1.5 * IQR, where IQR is the interquartile range.