Dr. Imanut wants to examine whether a new drugDr. Imanut wants to examine whether a new drugincreases the maze running performance of olderincreases the maze running performance of olderrats. Dr. Imanut teaches two groups of older rats to find arats. Dr. Imanut teaches two groups of older rats to find apiece of tasty rat chow in the maze. One group of rats is piece of tasty rat chow in the maze. One group of rats is given the new drug while they are learning the maze. The given the new drug while they are learning the maze. The second group is not given the drug. One week after second group is not given the drug. One week after having learned the maze he retests the rats and records having learned the maze he retests the rats and records how long it takes them to find the rat chow.how long it takes them to find the rat chow.

1. The independent variable:1. The independent variable:

• age of the rats.age of the rats.• type of maze.type of maze.• length of time it took the rats to run the maze.length of time it took the rats to run the maze.• presence or absence of the new drug.presence or absence of the new drug.

Dr. Imanut wants to examine whether a new drugDr. Imanut wants to examine whether a new drugincreases the maze running performance of olderincreases the maze running performance of olderrats. Dr. Imanut teaches two groups of older rats to find arats. Dr. Imanut teaches two groups of older rats to find apiece of tasty rat chow in the maze. One group of rats is piece of tasty rat chow in the maze. One group of rats is given the new drug while they are learning the maze. The given the new drug while they are learning the maze. The second group is not given the drug. One week after second group is not given the drug. One week after having learned the maze he retests the rats and records having learned the maze he retests the rats and records how long it takes them to find the rat chow.how long it takes them to find the rat chow.

2. The dependent variable:2. The dependent variable:

• age of the rats.age of the rats.• type of maze.type of maze.• length of time it took the rats to run the maze.length of time it took the rats to run the maze.• presence or absence of the new drug.presence or absence of the new drug.

Dr. Imanut wants to examine whether a new drugDr. Imanut wants to examine whether a new drugincreases the maze running performance of olderincreases the maze running performance of olderrats. Dr. Imanut teaches two groups of older rats to find arats. Dr. Imanut teaches two groups of older rats to find apiece of tasty rat chow in the maze. One group of rats is piece of tasty rat chow in the maze. One group of rats is given the new drug while they are learning the maze. The given the new drug while they are learning the maze. The second group is not given the drug. One week after second group is not given the drug. One week after having learned the maze he retests the rats and records having learned the maze he retests the rats and records how long it takes them to find the rat chow.how long it takes them to find the rat chow.

3. The control is:3. The control is:

• group that is given the drug.group that is given the drug.• group that is not given the drug.group that is not given the drug.• the size of the rats.the size of the rats.• the age of the rats.the age of the rats.

A researcher wanted to study the effects of sleep A researcher wanted to study the effects of sleep deprivation on physical coordination. The researcher deprivation on physical coordination. The researcher selected 25 year-old male college students and deprived selected 25 year-old male college students and deprived some of the subjects to either 24, 36, or 45 hours of sleep.some of the subjects to either 24, 36, or 45 hours of sleep.

4. The independent variable is:4. The independent variable is:

• the length of time the subjects were deprived of sleep.the length of time the subjects were deprived of sleep. • age of the subjects.age of the subjects. • the gender of the subjects.the gender of the subjects. • the physical coordination skills of the subjects.the physical coordination skills of the subjects.

A researcher wanted to study the effects of sleep A researcher wanted to study the effects of sleep deprivation on physical coordination. The researcher deprivation on physical coordination. The researcher selected 25 year-old male college students and deprived selected 25 year-old male college students and deprived some of the subjects to either 24, 36, or 45 hours of sleep.some of the subjects to either 24, 36, or 45 hours of sleep.

5. The dependent variable is:5. The dependent variable is:

• the length of time the subjects were deprived of sleep.the length of time the subjects were deprived of sleep. • age of the subjects.age of the subjects. • the gender of the subjects.the gender of the subjects. • the physical coordination skills of the subjects.the physical coordination skills of the subjects.

A researcher wanted to study the effects of sleep A researcher wanted to study the effects of sleep deprivation on physical coordination. The researcher deprivation on physical coordination. The researcher selected 25 year-old male college students and deprived selected 25 year-old male college students and deprived some of the subjects to either 24, 36, or 45 hours of sleep.some of the subjects to either 24, 36, or 45 hours of sleep.

6. The control would be:6. The control would be:

• 25 year old students that participate in collegiate 25 year old students that participate in collegiate athletics.athletics.

• how old the students are.how old the students are. • 25 year old male students without sleep deprivation.25 year old male students without sleep deprivation. • the physical coordination skills of the subjects.the physical coordination skills of the subjects.

A shopping mall wanted to determine whether the moreA shopping mall wanted to determine whether the moreexpensive “Tough Stuff” floor wax was better then theexpensive “Tough Stuff” floor wax was better then thecheaper “Steel Seal” floor wax at protecting its floor tilescheaper “Steel Seal” floor wax at protecting its floor tilesagainst scratches. One liter of each brand of floor waxagainst scratches. One liter of each brand of floor waxwas applied to 5 test sections of the main hall ofwas applied to 5 test sections of the main hall ofthe mall. The test sections were all the same size andthe mall. The test sections were all the same size andwere covered with the same kind of tiles. Five (5) otherwere covered with the same kind of tiles. Five (5) othertest sections received no wax. After 3 weeks, the numbertest sections received no wax. After 3 weeks, the numberof scratches in each of the test sections was counted.of scratches in each of the test sections was counted.

7. 7. The independent variable: The independent variable:

m)m) one liter of floor waxone liter of floor waxn)n) test sections that received no waxtest sections that received no waxo)o) different brand of floor waxdifferent brand of floor waxp)p) how many scratches were in the tiles after 3 weekshow many scratches were in the tiles after 3 weeks

A shopping mall wanted to determine whether the moreA shopping mall wanted to determine whether the moreexpensive “Tough Stuff” floor wax was better then theexpensive “Tough Stuff” floor wax was better then thecheaper “Steel Seal” floor wax at protecting its floor tilescheaper “Steel Seal” floor wax at protecting its floor tilesagainst scratches. One liter of each brand of floor waxagainst scratches. One liter of each brand of floor waxwas applied to 5 test sections of the main hall ofwas applied to 5 test sections of the main hall ofthe mall. The test sections were all the same size andthe mall. The test sections were all the same size andwere covered with the same kind of tiles. Five (5) otherwere covered with the same kind of tiles. Five (5) othertest sections received no wax. After 3 weeks, the numbertest sections received no wax. After 3 weeks, the numberof scratches in each of the test sections was counted.of scratches in each of the test sections was counted.

8. 8. The dependent variable: The dependent variable:

m)m) one liter of floor waxone liter of floor waxn)n) test sections that received no waxtest sections that received no waxo)o) different brand of floor waxdifferent brand of floor waxp)p) how many scratches were in the tiles after 3 weekshow many scratches were in the tiles after 3 weeks

A shopping mall wanted to determine whether the moreA shopping mall wanted to determine whether the moreexpensive “Tough Stuff” floor wax was better then theexpensive “Tough Stuff” floor wax was better then thecheaper “Steel Seal” floor wax at protecting its floor tilescheaper “Steel Seal” floor wax at protecting its floor tilesagainst scratches. One liter of each brand of floor waxagainst scratches. One liter of each brand of floor waxwas applied to 5 test sections of the main hall ofwas applied to 5 test sections of the main hall ofthe mall. The test sections were all the same size andthe mall. The test sections were all the same size andwere covered with the same kind of tiles. Five (5) otherwere covered with the same kind of tiles. Five (5) othertest sections received no wax. After 3 weeks, the numbertest sections received no wax. After 3 weeks, the numberof scratches in each of the test sections was counted.of scratches in each of the test sections was counted.

9. 9. The control:The control:

m)m) the size of the tilesthe size of the tilesn)n) test sections that received no waxtest sections that received no waxo)o) different brand of floor waxdifferent brand of floor waxp)p) how many scratches were in the tiles after 3 weekshow many scratches were in the tiles after 3 weeks