Stats Benchmark 2 Review Part 2

Front

What is the 20th percentile in a data set?

Back

The 20th percentile is the value below which 20% of the data falls. For example, in a set of weights, if a 5-pound puppy is at the 20th percentile, it means that 20% of the puppies weigh less than 5 pounds.

Front

What does a positive z-score indicate?

Back

A positive z-score indicates that the value is above the mean of the data set.

Front

What does a negative z-score indicate?

Back

A negative z-score indicates that the value is below the mean of the data set.

Front

How do you calculate the sample standard deviation?

Back

To calculate the sample standard deviation, find the mean of the data, subtract the mean from each data point, square the results, find the average of those squared differences, and then take the square root of that average.

Front

What is the formula for range in a data set?

Back

The range is calculated as the difference between the maximum and minimum values in the data set.

Front

What is Q3 in a data set?

Back

Q3, or the third quartile, is the median of the upper half of the data set, representing the value below which 75% of the data falls.

Front

What is the significance of the median in a data set?

Back

The median is the middle value when the data is ordered, and it divides the data into two equal halves.

Front

How do you find the interquartile range (IQR)?

Back

The interquartile range (IQR) is found by subtracting Q1 (the first quartile) from Q3 (the third quartile). IQR = Q3 - Q1.

Front

What does it mean if a data point is at the 30th percentile?

Back

If a data point is at the 30th percentile, it means that 30% of the data points are below that value.

Front

What is the purpose of calculating standard deviation?

Back

Standard deviation measures the amount of variation or dispersion in a set of values, indicating how spread out the data points are from the mean.