1.3 Experimental Design

Question 1

What is the independent variable in this experiment “ The growth of plants is limited by the amount of key nutrients: phosphors, nitrogen, and potassium, that are in the soil. Plants treated with fertilizer will produce more fruits than the plants without fertilizer because they will have more nutrients required for growth?”

Answer 1

The amount of fertilizer the plant is receiving.

Question 2

What does no overlapping of error bars tell you?

Answer 2

the difference is statistically significant

Question 3

What is the first step in writing a hypothesis?

Answer 3

coming up with a specific reason that explains a phenomena.

Question 4

What is the importance of a control group?

Answer 4

The importance of a control group is to have something to compare your data to.

Question 5

True or False: You should use weak statements when writing a hypothesis.

Answer 5

False, when writing a hypothesis you should use strong statements to make others believe that your hypothesis is accurate.

Question 6

When should you use a bar graph

Answer 6

You should use a bar graph when the independent variable is grouped.

Question 7

When you have a controlled experiment how many independent variables are being changed?

Answer 7

One