Transcript
Exercise 1: Data Interpretation What patterns do you observe based on the information in Table 4? The number of plants is decreasing as the lead concentration increases. The lead concentration has a huge effect on the number of plants. In the beginning, the variables go on the opposite sides. What type of graph is most appropriate to present the data in Table 4? Create a graph of the data in Excel or another graphing software and submit it to your instructor. Is it easier to observe patterns and see the connection between lead concentration in soil and the number of plants using a graph or table? After creating your graph, would you change your answer to Question 1? It is much easier to observe patterns and see the connection between lead concentration in soil and the number of plants using a graph or table. I would not change my answer to question 1 because the answer to question 1 is the same. Develop a detailed hypothesis for your experiment. The increase in lead concentration in the soil degrades the growth of plants. What would your experimental approach be to test this hypothesis? Be detailed in your description of the experiment. My approach would be to grab 10 plant pots. In each plant pot, put a different amount of lead concentration in the soil. Then, put seeds on the pot and observe. What are the independent, dependent, and controlled variables in your experiment? Independent variable – The amount of lead put on the plant pot. Dependent variable – The plant growth Controlled variables – The amount of sunlight and water needed for plant growth. What type of graph would be appropriate for this data set? Why? A Data table would be appropriate for this data set because it will specify the lead concentration on one column set and the number of plants that grow on the other one. Exercise 2: Testable Observations A plant grows three inches faster when placed on a windowsill than it does when placed on a coffee table in the middle of the living room. Hypothesis: A plant will grow faster when put next to a window because the sunlight it receives promotes faster growth. Null Hypothesis: The plant that is set on the coffee table will grow at the same rate as the plant set next to the window. Experimental Approach: Grab two small plants of the same kind, put one of the plants next to a window and the other plant on the coffee table, then observe which one grows faster. Independent: The location of the plants. Dependent: The growth rate of the plants. Controlled: The amount of water provided to each plant. Experimental group: The plant on the window Control group: The plant on the coffee table The data will be collected on a line graph The red car you saw on the highway was driving faster than the blue car. The observation is not testable. When Daniel eats healthy food, his blood pressure is 10 points lower than when he eats unhealthy food. Hypothesis: Daniel’s blood pressure lowers when he eats healthy foods, when he eats unhealthy foods, the blood pressure increases. Null Hypothesis: Daniel’s blood pressure lowers when he eats healthy foods, but his blood pressure increases when he eats unhealthy food. Experimental Approach: On one day give Daniel to eat healthy food and test how much his blood pressure lowers. However, on another day give Daniel unhealthy food to see if his blood pressure lowers. Independent: The healthy and unhealthy food. Dependent: The blood pressure. Controlled: The amount of food given. Experimental group: Healthy food. Controlled group: Unhealthy food. Data will be collected on a chart. Fresh baked bread develops mold more quickly than bread purchased at the store. Hypothesis: The bread that is fresh develops mold at a much faster rate, than the bread purchased at a store Null Hypothesis: The bread that is fresh develops mold at the same rate as the bread from the store. Experimental Approach: Get the two breads and put them closely to each other on a table and observe over the days to see which develops mold faster. Independent: The bread. Dependent: Mold development. Controlled: The environment in which the bread is placed Experimental group: Fresh baked bread. Controlled group: Bread from the store. For the past three years, there has been a blizzard on Halloween. The observation is not testable. Exercise 3: Conversion 46,756 mg = _0.046756__ kg 7.1 hours = __25,560__ seconds 346 cm = ___136.2_____ inches 97 °F = ___36.1____ °C 0.45 miles = ___724.203____ meters 9.3 pounds = ___4218.406___ grams 8.5 days = ___734,400___ seconds 22 °C = ___71.6____ °F Exercise 4: Accuracy and Precision During gym class, four students decided to see if they could beat the national average of 20 pull-ups in 1 minute. The first student did 21 pull-ups, the second did 4, the third did 19, and the fourth did 7. Accurate Precise Neither Both The average score for the 12th-grade math test is 76.5. The top 12th graders took the test and scored 89, 93, 91, and 87. Accurate Precise Neither Both Yesterday the temperature was 74 °F, tomorrow it’s supposed to be 76 °F, and the next day it’s supposed to be 75 °F. The average temperature for September is 75 °F. Accurate Precise Neither Both Four friends decided to play horseshoes. They took a picture of their results, shown in Figure 9. Figure 9: Horseshoes thrown at a stake. Accurate Precise Neither Both A local grocery store held a contest to see who could most closely guess the number of pennies inside a large jar. The first six people guessed the numbers 300, 345, 390, 300, 1005, and 366. The grocery clerk said the jar actually contains 347 pennies. Accurate Precise Neither Both Exercise 5: Significant Digits and Scientific Notation Part 1 435000 – 3 significant digits 0.0097 – 2 significant digits 39.998999 – 8 significant digits 73.00 – 4 significant digits 80,003,089 – 8 significant digits 45,430.00 – 7 significant digits 0.0000863 – 3 significant digits 621.03080 – 8 significant digits Part 2 70,010,000,000 – 7.001 x 1010 0.000000047 – 4.7 x 10-8 62,890,000 – 6.289 x 107 70,900 – 7.09 x 104 450,100,800 – 4.501008 x 108 0.009046 – 9.046 x 10-3 0.028 – 2.8 x 10-2 Experiment 1: Design an Experiment Include your lab report, written according to the instructions given to you in Table 3 of the Introductory content, here.
