Scientific Method

Research hypothesis is the same as

• Prediction

• Null hypothesis

• alternate hypothesis

• None of the above

There is no statistically significant difference in life expectancy between guitarists and pianists. - This is an example of

• Simple hypothesis

• Complex hypothesis

• Alternative hypothesis

• Null hypothesis

There are more male births than female births - this is an example of

• Complex hypothesis

• statistical hypothesis

• Null hypothesis

• Directional hypothesis

Victoria places same bacteria in two petri dishes. She places 10 bacteria in normal atmosphere and she places another 10 bacteria in a Petri dish in which oxygen is double the normal level. She names the petri dishes as Group A and Group B. Which statement best describes the groups ?

• Group A is the control group and Group B is the experimental group

• Group A is the experimental group and Group B is the control group

• Group A is the variable and Group B is the observation.

• Group A is theoretical and Group B is hypothetical.

What would the INDEPENDENT variable be in this experiment: Which plane would fly the furthest, a airplane made of plain paper or an airplane made of construction paper?

• Distance travelled by the plane

• Paper used

• Height measured

• How hard the plane is thrown

Three redwood trees are kept at different humidity levels inside a greenhouse for 12 weeks. One tree is left outside in normal conditions. The heights of the trees are measured once a week. What is the dependent variable?

• Redwood trees

• humidity level

• Heights of the trees

• Green house

Controlled variables are factors you hold constant. How many controlled variables can there be in an experiment?

• 0

• 1

• 2

• as many as you want

The purpose of conclusion in scientific method is to

• Explain the reason for doing the experiment

• State the expected outcome of the experiment

• State whether the data supports the hypothesis

• Give sources of information to the investigation

When graphing a correlation, the independent variable occupies the ____ axis.

• x

• y

• z

• origin

To demonstrate how limited food supply affects animal populations, a college professor did an activity with the class group. He used paper clips represented as food, and the students represented the animal population. The professor placed clips all around the class room and students walk around and collected them. A student who collected six paper clips had enough food to eat. Which statement indicates LIMITATION of the model?

• It assumes animals may migrate

• It does not allow animals to roam out of the area to find food

• It considers other factors such as re growth of the food.

• It forces animals to eat more food than is necessary to survive.