Question

Activity 5: Putting It All Together with a Graph Part A Use your understanding of the scientific process to answer the following questions Sun Kissed is a popular sunscreen that has been successfully used to prevent bumo many years. Recently, industry scientists developed a new chemical that may be more effective at preventing burns. The sunscreen with the active ingredient is called Sun Industry scientists gathered 100 test subjects and applied three different lotions to the different square Inch patches of skin on each subiect's arm. The three different lotions applied to each test subject were: Sun X Sun Kissed, and the lotion alone with no active Ingredient. The same amount of lotion was applied to each area of skin tested.) Aher waiting 20 minutes for the lotion to soak into the skin the test subject's arms were exposed to direct sunlight. The amount of redness was measured in unitsquare inch) every five minutes for a total of 30 minutes Below is the data collected from the experiment: Average Amount of Redness (units/square inch) Lotion Alone Sun Kissed Time (min) Sun X 00 NO SN 0.5 4.1 7.8 9.2 13.5 17 22 0.6 0.8 1 1. What question is being asked in the experiment above? 2. Write a suitable hypothesis for this study. (Your instructor may ask you to write a null and an allemative hypothesis.)

3. State the prediction based on your hypothesis 4. What is the independent variable in this experiment? 5. What is the dependent variable in this experiment? 6. Which variables are held constant? That is what are the controlled variables in the expenment 7. Which application of lotion is the experimental treatment? 8. Which treatment is the negative control? Explain why a negative control is necessary. 9. Which treatment is the positive control? Explain why the positive control is necessary,

Part B: Use the data collected by industry scientists in Part A) to com graphing activity. in Part A) to complete the following 1. What type of graph will you use to present the data? le bar graph, graph, scatter plot, pie chart) Le bar graph, Ane graph, multiple line 2. Which variable will be on the x axis? 3. Which variable will be on the y-axis? 4. Construct a graph to display the results of the industry shy Use appropriate scale, label the axes with names and units of measurement and give the graph a "good" title. (Graphing paper will be provided.) 5. What is your conclusion based on the results of the experiment? Is Sun X a more effective sunscreen than Sun Kissed? Explain how the data support or reject your hypothesis.

Answer 1

PART A

1)In this case, the research tries to determine if Sun X reduce the redness more than the other lotion. So, the question would be “Is the Sun X effective against the redness produced by the sun light?”

2)Alternative hypothesis: If the Sun X is an effective sun blocker, then the group treated with Sun X will have less amount of redness than other other groups”. Null hypothesis: If the Sun X is not effective enough, then the group treated with Sun X has will have more or the same amount of redness than the other groups

3)In this case, the prediction would be that the exposition to the sun when the group is treated with Sun X will reduce the amount of redness

4)The independent variable is the time of exposition.

5)The dependent variable is the average amount of redness because it depends on the efficacy of the lotions and time of exposition

6)The type of lotion is being controlled in each group

7)The experimental group is the Sun X treatment

8)The negative control is the group who was exposed to lotion alone