Section 1 What Makes a Good Experiment 1616 3 K Understandin

Section 1: What Makes a Good Experiment? 16/16 3 K Understanding Experimental Design Use the following passage to answer the first 5 questions. A farmer who grows blackberries has found his harvest to be lower than usual. He suspects that some animals are eating the berries before he can pick them. The farmer thinks it may be either birds (landing on the bushes to feast on be es) or rodents (climbing the bushes from below to munch on berries). He decides to first test the hypothesis that birds are eating his berries, and consults with a local expert on how best to prevent the birds from eating berries. He has eight fields with 10 rows of berry bushes in each field. In one of his fields (depicted below, as viewed from above), he covers half of the rows with nets that will prevent birds from landing on the bushes, and he leaves the other half uncovered. Over the course of 8 weeks, he counts the be es harvested from each row of bushes in the test field. Q1.18. What is the independent (treatment) variable in the farmer\'s experiment? Presence /absence of birds O Presence/absence of nets O Number of rows Number of berries harvested Q1.19. What is the dependent (response) variable in his experiment? Presence /absence of birds O Presence/absence of nets O Number of rows Number of berries harvested Q1.20. What are the experimental units in his experiment? NOTES QUESTIONS

Solution

The answers:

18->independant variable

a)presence/absence of birds

b)presenc/absence of nets

19.Dependant variable->number of berries harvested (as everything depends on them)

20.experimental units->rows of bushes( as all experiements are performed on them)

21.control group->The uncovered cows

22.Birds are not eating the berries