Experiment vs. Observational Study

Researchers are investigating if girls type faster than boys. They record how long it takes for a SRS of 20 boys and 20 girls to type 500 words and compare the averages.

• Survey

• Observational Study

• Experiment

A school wants to know what percent of their students ride the bus home. The bus drivers as asked to count the number of students they drive one day.

• Survey

• Observational Study

• Experiment

A farmer puts fertilizer on half his corn plans and no fertilizer on the other half. He determines which half produced more corn at the end of the season.

• Survey

• Observational Study

• Experiment

The city of Smyrna wants to know which brand of paint will last longer. They paint 2 streets with brand A and two streets with brand B and checked which lasted longer.

• Survey

• Observational Study

• Experiment

In an ________________, a researcher observes and measures characteristics of interest of part of the population but does not change existing conditions.

• Experiment

• Observational Study

Individuals are observed and variables are measured without controlling the individuals or the environment

• population

• observational study

• experiment

• secondary data

A teacher looks at his students tests to see which topics his students are still struggling with.

• Survey

• Observational Study

• Experiment

A group of 15 men were told to drink one cup of coffee each morning. Another group of 15 men were told to drink two cups of coffee each morning. One month later, doctors measured their heart rate.

• Survey

• Observational Study

• Experiment

Four groups of randomly selected people are assigned a different diet. After six months, the blood pressures of each group are compared.

• Observational Study

• Experiment

You want to see if students who have a 4.0 grade point average study more than those who do not.

• experiment

• observational study