Percentiles and Standard Deviation Quiz

18 Questions

What is the purpose of scales, grid lines, dots, and legends used in graphical data presentations?

To indicate the data being represented

In a standard normal distribution, where do approximately 68% of the data lie?

Within one standard deviation from the mean

What does a Venn diagram represent using circular regions?

Various sets of objects

What term describes the range of the middle 50% of a dataset, showing how spread out the values are?

Interquartile range

If a scale on a line graph does not begin at zero, what might this practice lead to?

Misinterpretation of data

How are areas of individual sectors represented in a circle graph according to standard conventions?

Proportional to the percents they represent

What does the 25th percentile represent in terms of quartiles?

First quartile

What is the median for a list of data with an even number of elements?

The mean of the two middle numbers

Which statistic measures the spread of data about the mean?

Standard deviation

How are quartiles defined for data listed in increasing order?

They divide the data into four groups with roughly equal size

What does the mode represent in a set of data?

The most frequently occurring number

What is the standard deviation of a set of data related to?

Mean and each data point

How is the interquartile range (IQR) calculated?

Second quartile minus first quartile

How many numbers divide the data into 100 groups for percentiles?

If the 50th percentile is also known as the median, what does the 75th percentile represent?

Third quartile

In a set of data, what does the interquartile range represent?

The range of the second and third quartiles

What does the range of a set of data measure?

Difference between maximum and minimum values

What is calculated by subtracting the first quartile from the third quartile?