AP Exam Review #3

What axis does the dissolved oxygen concentration appear on in the histogram?

• Both axes

• Vertical axis

• Horizontal axis

• Neither axis

What does the histogram represent in the study?

• Stream flow rate

• Temperature of streams

• pH level of water

• Dissolved oxygen concentration

What is the shape of the distribution for colder streams?

• Uniform

• Skewed right

• Bimodal

• Unimodal and skewed left

What statistical measure is found between 11 and 12 milligrams per liter in colder streams?

• Mean

• Mode

• Range

• Median

How is the first quartile determined in the histogram?

• Using a computer software

• Using a calculator

• By counting bars until reaching 25%

• Estimating visually

What does the IQR represent in the data analysis?

• Total spread of the data

• Range of most data points

• Average value of the data

• Middle 50% of the data

Which streams are generally healthier for wildlife according to the dissolved oxygen concentration?

• Warmer than 8 degrees Celsius

• Colder than 8 degrees Celsius

• Both are equally healthy

• Neither is healthy

What experimental method is used to test the concrete's effectiveness?

• Case study

• Survey

• Longitudinal study

• Completely randomized experiment

What is used to measure the severity of cracks in the concrete experiment?

• Binary scale

• Visual inspection

• Numerical scale from 0 to 10

• Percentage scale

What is the benefit of random assignment in the concrete experiment?

• Improves concrete quality

• Establishes cause and effect

• Reduces cost

• Increases speed of the experiment