11/21 AMDM: Stats Review (meas.cent.tend/grade calc/box&whisker)

Front

What is the definition of mean in statistics?

Back

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

Front

How do you calculate the median of a data set?

Back

To find the median, arrange the numbers in ascending order and identify the middle value. If there is an even number of values, the median is the average of the two middle numbers.

Front

What is the formula for calculating a weighted average?

Back

Weighted average = (sum of (value * weight)) / (sum of weights).

Front

What percent of a data set is considered to be in the interquartile range (IQR)?

Back

The interquartile range (IQR) represents the middle 50% of a data set, calculated as Q3 - Q1.

Front

What is a box-and-whisker plot?

Back

A box-and-whisker plot is a graphical representation of a data set that shows the median, quartiles, and potential outliers.

Front

How do you find the range of a data set?

Back

The range is found by subtracting the smallest value from the largest value in the data set.

Front

What is the significance of the 25th and 75th percentiles in a data set?

Back

The 25th percentile (Q1) is the value below which 25% of the data falls, and the 75th percentile (Q3) is the value below which 75% of the data falls.

Front

What is the purpose of calculating standard deviation?

Back

Standard deviation measures the amount of variation or dispersion in a set of values.

Front

How do you interpret a box-and-whisker plot?

Back

A box-and-whisker plot shows the distribution of data based on a five-number summary: minimum, Q1, median, Q3, and maximum.

Front

What is the difference between population and sample in statistics?

Back

A population includes all members of a defined group, while a sample is a subset of the population used for analysis.