Reference no: EM133651938
Questions
1. Smithers thinks that drinking coffee will increase the productivity of workers. He creates two groups of 50 workers each and assigns each group the same task (to staple a set of papers). Group A is given 500 mL of coffee to drink while they work. Group B is not given coffee. After an hour, Smithers counts how many stacks of stapled papers each group has made. Group A stapled 1,587 stacks; Group B stapled 2,113 stacks.
What is the control group?
A. The group without Coffee
B. The group with coffee
C. Mr. Smithers
2. Smithers thinks that drinking coffee will increase the productivity of workers. He creates two groups of 50 workers each and assigns each group the same task (to staple a set of papers). Group A is given 500 mL of coffee to drink while they work. Group B is not given coffee. After an hour, Smithers counts how many stacks of stapled papers each group has made. Group A stapled 1,587 stacks; Group B stapled 2,113 stacks.
What is the independent variable?
A. Stapling Papers
B. Drinking Coffee
C. Making Coffee
D. Making Paper
3. Smithers thinks that drinking coffee will increase the productivity of workers. He creates two groups of 50 workers each and assigns each group the same task (to staple a set of papers). Group A is given 500 mL of coffee to drink while they work. Group B is not given coffee. After an hour, Smithers counts how many stacks of stapled papers each group has made. Group A stapled 1,587 stacks; Group B stapled 2,113 stacks.
What is the dependent variable?
A. Stapling Papers
B. Drinking Coffee
C. Making Coffee
D. Making Paper
4. If you were to graph Mr. Smithers's data, the number of stapled papers would go on the __ axis.
A. X
B. y
5. What is a possible conclusion from this?
A. Coffee increased productivity
B. Coffee decreased productivity
C. Coffee had no effect on productivity
6. An experiment was conducted to measure how fast the human salivary enzyme amylase breaks down starch if it is at different concentrations. Ten mL of starch solution and 1 mL of amylase solution were placed in Test Tube A. Test Tube B had 10 mL of starch and 5 mL of amylase. The test tubes were mixed and then incubated at 25 º C. The amount of product (maltose) present was measured after an hour. After 1 hour, test tube A had 3 ml of maltose. Test tube B had 7 mL of maltose.
What is the independent variable?
A. Amount of Strach
B. Amount of Amylase
C. Amount of Maltose
7. An experiment was conducted to measure how fast the human salivary enzyme amylase breaks down starch if it is at different concentrations. Ten mL of starch solution and 1 mL of amylase solution were placed in Test Tube A. Test Tube B had 10 mL of starch and 5 mL of amylase. The test tubes were mixed and then incubated at 25 º C. The amount of product (maltose) present was measured after an hour. After 1 hour, test tube A had 3 ml of maltose. Test tube B had 7 mL of maltose.
What is the dependent variable?
A. Amount of Strach
B. Amount of Amylase
C. Amount of Maltose
8. Which statement could be a possible hypothesis?
A. More starch will make the reaction go faster and make more maltose
B. More amylase will make the reaction go faster and make more maltose
C. A longer time will make more maltose.
D. Less time will make more maltose.
9. In 1887 a strange nerve disease attacked the people in the Dutch East Indies. The disease was beriberi. Symptoms of the disease included weakness and loss of appetite, victims often died of heart failure. Scientists thought the disease might be caused by bacteria. They injected chickens with bacteria from the blood of patients with beriberi. The injected chickens became sick. However, so did a group of chickens that were not injected with bacteria. One of the scientists, Dr. Eijkman, noticed something. Before the experiment, all the chickens had eaten whole-grain rice, but during the experiment, the chickens were fed polished rice. Dr. Eijkman researched this interesting case and found that polished rice lacked thiamine, a vitamin necessary for good health.
Which statement from the paragraph best summarizes the hypothesis?
A. Dr. Eijkman researched this interesting case and found that polished rice lacked thiamine
B. Scientists thought the disease might be caused by bacteria.
C. They injected chickens with bacteria from the blood of patients with beriberi.
D. The injected chickens became sick. However, so did a group of chickens that were not injected with bacteria.
10. In 1887 a strange nerve disease attacked the people in the Dutch East Indies. The disease was beriberi. Symptoms of the disease included weakness and loss of appetite, victims often died of heart failure. Scientists thought the disease might be caused by bacteria. They injected chickens with bacteria from the blood of patients with beriberi. The injected chickens became sick. However, so did a group of chickens that were not injected with bacteria. One of the scientists, Dr. Eijkman, noticed something. Before the experiment, all the chickens had eaten whole-grain rice, but during the experiment, the chickens were fed polished rice. Dr. Eijkman researched this interesting case and found that polished rice lacked thiamine, a vitamin necessary for good health.
Which statement from the paragraph best summarizes the experiment?
A. Dr. Eijkman researched this interesting case and found that polished rice lacked thiamine.
B. Scientists thought the disease might be caused by bacteria.
C. They injected chickens with bacteria from the blood of patients with beriberi.
D. The injected chickens became sick. However, so did a group of chickens that were not injected with bacteria.
11. Do the results of this experiment confirm this hypothesis or does the hypothesis need to be re-evaluated?
A. Confirm
B. Re-evaluate