Question

1. 48 soybean seedlings at the 3-leaf stage, divided at random into 8 groups of 6. Each group of 6 was placed into a tray where it remained for the duration of the experiment. Four groups of 6 were chosen at random and placed in a chamber and exposed to filtered air containing 700 ppm (parts per million) carbon dioxide for 16 weeks. The other 4 groups of 6 were placed in an identical chamber and exposed to filtered air containing 380 ppm carbon dioxide (average atmospheric concentration) for 16 weeks. After the experiment, all plants were returned to the greenhouse. When the beans matured, the following were measured on each of the 48 plants: 2. 3. 4. The number of bean pods The number of seeds per pod The weight of pods " 5. Questions 1. 2. 3. 4. 5. 6. 7. The experiment was repeated two more times. Which is (are) the dependent variable(s)? Which is (are) the independent variable(s)? With the information that you've been given, were there any controlled variables? How many levels of treatment were there? How many replicates were there? How many repetitions? Were there any controls? If so, what were they? Could you improve this experiment? How

Answer 1

Soln

Following One- Way ANOVA Scenario

700 ppm	380 ppm
Group 1	Group 1
Group 2	Group 2
Group 3	Group 3
Group 4	Group 4

Each Group has 6 Subunits each

1)

No Dependent Variable

2)

One Independent Variable: Filtered Air

3)

No, there are no controlled variable

4)

2 Levels of treatment are there.

5)

4 Replicates (Groups) with 6 repetitions

6)

No, there were no controls.

7)

We would improve the experiment by adding one Controlled variable.