Experiments chapter 11 part 2

1. Experiments chapter 11 part 2 What is an Experiment?

2. An Experiment See experiment handout and Zener card deck

3. Vocabulary and the Experiment Subjects / Experimental Units: Who/what the experiment is done to or with. Answer question B2: What are the subjects of the experiment?

4. Vocabulary and the Experiment Factors: The variable you change between treatments to see if they have any effect on the response variable. Answer question B3: What is the factor of the experiment?

5. Vocabulary and the Experiment Treatments: What the experimental units get – there can be different levels of the factor which creates a treatment for each level. Answer question B4: What is the factor of the experiment?

6. Vocabulary and the Experiment Response Variable: The data we are collecting from the experiment to compare between treatments. Answer question B5: What is the response variable?

7. Vocabulary and the Experiment Random Assignment: To be valid, an experiment MUST assign experimental units to treatments randomly Answer question B6: how was randomness used in the experiment

8. Vocabulary and the Experiment Nature and Scope of conclusion: What was the results of the experiment and who/what does it apply to? Answer question B7:

9. Class Example C: A dog food company wants to compare a new lower calorie food with their standard dog food to see if it's effective in helping inactive dogs maintain a healthy weight. They have found several dog owners willing to participate in the trial. The dogs have been classified as small, medium, or large breeds, and the company will supply some owners of each size of dog with one of the two foods. The owners have agreed not to feed their dogs anything else for a period of 6 months, after which the dogs' weights will be checked. 1) What are the experimental units of the experiment?

10. Class Example C: A dog food company wants to compare a new lower calorie food with their standard dog food to see if it's effective in helping inactive dogs maintain a healthy weight. They have found several dog owners willing to participate in the trial. The dogs have been classified as small, medium, or large breeds, and the company will supply some owners of each size of dog with one of the two foods. The owners have agreed not to feed their dogs anything else for a period of 6 months, after which the dogs' weights will be checked. • 2) What are the factors of the experiment?

11. Class Example C: A dog food company wants to compare a new lower calorie food with their standard dog food to see if it's effective in helping inactive dogs maintain a healthy weight. They have found several dog owners willing to participate in the trial. The dogs have been classified as small, medium, or large breeds, and the company will supply some owners of each size of dog with one of the two foods. The owners have agreed not to feed their dogs anything else for a period of 6 months, after which the dogs' weights will be checked. • 3) What are the levels of the factors?

12. Class Example C: A dog food company wants to compare a new lower calorie food with their standard dog food to see if it's effective in helping inactive dogs maintain a healthy weight. They have found several dog owners willing to participate in the trial. The dogs have been classified as small, medium, or large breeds, and the company will supply some owners of each size of dog with one of the two foods. The owners have agreed not to feed their dogs anything else for a period of 6 months, after which the dogs' weights will be checked. • 4) What are the treatments of the experiment?

13. Class Example C: A dog food company wants to compare a new lower calorie food with their standard dog food to see if it's effective in helping inactive dogs maintain a healthy weight. They have found several dog owners willing to participate in the trial. The dogs have been classified as small, medium, or large breeds, and the company will supply some owners of each size of dog with one of the two foods. The owners have agreed not to feed their dogs anything else for a period of 6 months, after which the dogs' weights will be checked. • 5) What is the response variable?

14. Class Example C: A dog food company wants to compare a new lower calorie food with their standard dog food to see if it's effective in helping inactive dogs maintain a healthy weight. They have found several dog owners willing to participate in the trial. The dogs have been classified as small, medium, or large breeds, and the company will supply some owners of each size of dog with one of the two foods. The owners have agreed not to feed their dogs anything else for a period of 6 months, after which the dogs' weights will be checked. • 6) How is randomness used in the experiment?

15. Class Example C: A dog food company wants to compare a new lower calorie food with their standard dog food to see if it's effective in helping inactive dogs maintain a healthy weight. They have found several dog owners willing to participate in the trial. The dogs have been classified as small, medium, or large breeds, and the company will supply some owners of each size of dog with one of the two foods. The owners have agreed not to feed their dogs anything else for a period of 6 months, after which the dogs' weights will be checked. • 7) What is the nature and scope of the conclusion?

16. Class Example D: Some people who race greyhounds give the dogs large doses of vitamin C in the belief that the dogs will run faster. Investigators at the University of Florida tried three different diets in random order on each of five racing greyhounds. They were surprised to find that when the dogs ate high amounts of vitamin C they ran more slowly. • As a team, answer the questions for example D on your student notes.