1.3 Graphs and Experimental Design

Question 1

What is the difference between a bar graph and a line graph?

Answer 1

A bar graph groups the independent variable, while a line graph quantifies the independent variable or relates it to time.

Question 2

What is an error bar used for?

Answer 2

An error bar is used to show how much variability there is in a sample.

Question 3

If an error bar is large, is there more or less variability?

Answer 3

More variability

Question 4

If an error bar is small, is there more or less variability?

Answer 4

Less variability

Question 5

What does it mean if error bars are overlapping?

Answer 5

There is likely not a significant difference between the groups.

Question 6

What does it mean if error bars are not overlapping?

Answer 6

There is likely a significant difference between the groups.

Question 7

What is a control group?

Answer 7

a control group is the standard to which comparisons are made in an experiment.

Question 8

There are three groups in an experiment that is testing the effectiveness of a new pill. What would be the best option for a control group?

Answer 8

Give the control group a pill that has no effect instead of not giving them anything.

Question 9

What is the template for a scientific hypothesis?

Answer 9

The < phenomenon, topic > (is due to, is caused by, depends on) < specific reason >

Question 10

What is the template for a testable statement?

Answer 10

If < independent/manipulated variable > < increases/decreases > then < dependent/respondent variable> < increases/decreases >