Are you ready to take this lesson's quiz? The questions below will help you find out. Make sure you understand why each correct answer is correct—if you do not, review that part of the lesson.
We have designed and executed an experiment that hypothesizes: “If daffodils have a teaspoon of sugar added to their water, then they will stay fresher than daffodils with only water.” We observe one vase with a daffodil with sugar added and one vase with a daffodil in plain water. We observe the flowers daily. After 3 days, the daffodil in plain water is slightly wilted. The daffodil in the sugar water appears nearly as fresh and upright as it was on day one. Which of the following is the best conclusion?
- Sugar water coats the outside of the stem of the daffodil helping to preserve its freshness.
- Sugar water penetrates the plant's vascular system better than un-sugared water, thereby allowing the flower to remain fresh.
- Sugar water keeps a flower fresher than plain water.
- The water sweetened with sugar flows more easily into the flower through the stem.
A simple conclusion can be made based on our simple observations. Other conclusions make assumptions that were not tested.
A simple conclusion can be made based on our simple observations. Other conclusions make assumptions that were not tested.
A simple conclusion can be made based on our simple observations. Other conclusions make assumptions that were not tested.
A simple conclusion can be made based on our simple observations. Other conclusions make assumptions that were not tested.
An experiment was designed to test the hypothesis that laundry detergent A is better at removing stains than laundry detergent B. Two white cotton shirts were stained with grass, coffee, and ketchup. One shirt was washed with laundry detergent A, and the other was washed with laundry detergent B after soaking in it for 15 minutes. The stains faded 75% with laundry detergent A and 90% with laundry detergent B. The experimenters concluded that laundry detergent B was better. Would a peer reviewer agree?
- No; the shirt with laundry detergent B was soaked, while the other shirt was not.
- Yes; all variables were controlled in the experiment so it is valid.
- No; the two shirts were not made of the same material, so the test is not valid.
- Yes; laundry detergent B was better at removing the stains than laundry detergent A.
A peer reviewer looks for errors in the experiment, like when an experiment changes more than one variable, doesn’t do enough tests, or if the wrong conclusion was made.
A peer reviewer looks for errors in the experiment, like when an experiment changes more than one variable, doesn’t do enough tests, or if the wrong conclusion was made.
A peer reviewer looks for errors in the experiment, like when an experiment changes more than one variable, doesn’t do enough tests, or if the wrong conclusion was made.
A peer reviewer looks for errors in the experiment, like when an experiment changes more than one variable, doesn’t do enough tests, or if the wrong conclusion was made.
An experiment was designed to test the hypothesis: “If apples are soaked in sugar water, then they will not turn brown.” An apple was cut into four slices, then one slice was soaked in water, one slice was soaked in water with sugar, one slice was soaked in lemon juice, and one slice was not soaked at all. The soaked apples were left in their liquids for 5 minutes. All apples were then dried with a paper towel and put on a plate. The apples were checked every 2 minutes and data was recorded. The plain apple was brown after 4 minutes, the sugar water apple was brown after 8 minutes, the plain water apple was brown after 40 minutes, and the lemon juice apple was still not brown after 60 minutes. What is the best conclusion?
- Lemon juice is the best way to keep apples from turning brown.
- Sugar water does not keep apples from turning brown.
- Plain water stops apples from turning brown.
- Apples will turn brown if left in open air.
The conclusion should be directly related to the experiment’s hypothesis.
The conclusion should be directly related to the experiment’s hypothesis.
The conclusion should be directly related to the experiment’s hypothesis.
The conclusion should be directly related to the experiment’s hypothesis.
Which statement best describes the conclusion of an experiment?
- A process where the experimental results are shared.
- An explanation of the data collected in the experiment.
- A detailed explanation of the experiment’s steps.
- A brief summary of the results of the experiment.
A conclusion is made at the end of the experiment to compare the results to the original hypothesis.
A conclusion is made at the end of the experiment to compare the results to the original hypothesis.
A conclusion is made at the end of the experiment to compare the results to the original hypothesis.
A conclusion is made at the end of the experiment to compare the results to the original hypothesis.
Summary
Questions answered correctly:
Questions answered incorrectly:
