2.7 How Valid is the Data?

Question 1

Why can investigations about distribution of organisms in their environment be very difficult?

Answer 1

They are usually done over a very long time and not all variables can be controlled

Question 2

Name a control variable of the transect test?

Answer 2

Time of day

Question 3

Why must all possible variables be controlled in a valid investigation?

Answer 3

To make sure each test has the same conditions so it is only the independent variable that is being tested

Question 4

What makes a measurement repeatable?

Answer 4

If the original experimenter repeats the investigation and gets the same results

Question 5

What makes a measurement reproducible?

Answer 5

If someone else can be repeated by someone else or use a different method/equipment and get the same results

Question 6

Why is sample size important?

Answer 6

To get representative results, the larger the sample size, the more we trust we can have in the data from the tests