09.01 Inferences Questions 1-10 of 10 | Page 1 of 1 Question 1 (5 points) Which of these statements describes a key distinction between an observational study and an experimental study? O a Experimental studies are more representative of the larger population than observational studies. Ob Data is collected in experimental studies, but not in observational studies. OC Observational studies try to answer a question, but experimental studies do not. O d Experimental studies directly influence something to see its effect, but observational studies do not directly influence the subjects. Question 2 (5 points) Tyler is interested in how different environments affect dandelion plants. For a science fair project, Typer looks for dandelions growing in the grass and growing in dirt without grass. He counts the number of days it takes each dandelion to turn from a yellow flower to seeds. After 6 weeks, he compares the number of days it takes for the dandelions growing in the grass to turn from a yellow flower into seeds to the number of days it takes for the dandelions growing in the dirt without grass to turn from a yellow flower into seeds. How could Tyler's design be improved to collect data that would be better for answering the question of interest? BIU E E S'STO Question 3 (5 points) Elena is interested in whether music affects plant growth. For a science fair project, she will grow one plant in a room that is normally kept quiet. She will grow another plant in another room that has classical piano music playing all the time. After 2 months, she compares the height of the plants to determine the effect of music on plant growth. What type of study is Elena designing?Question 4 (5 points) lake is designing a study to determine whether mold grows faster in tap water or bottled water. To do this, he compares the growth rate of mold growing in a glass of tap water to the growth rate of mold growing in a glass of bottled water. What type of study is Jake designing? BIUS'S, Question 5 (5 points) Match the description of the study in Column A with the type of study being conducted in Column B. Column A Column B Does a certain multivitamin help people lose a. An experimental study weight? Researchers select 100 people to participate in the study and assign them to 2 b. An observational study that is not a survey. groups at random. One group is given the multivitamin. The other group is given a fake C. A survey pill. The weights of all of the participants are recorded daily for the next three months. 2. How do business customers feel about the level of support they receive? The business randomly selects 200 customers and asks them to share their opinions. 3. Do truck drivers get into more accidents than people who drive SUVs? Researchers use police records of automobile accidents over the past year and vehicle registrations to compare the percentage of drivers of vehicles of each type that get into accidents.Question 6 (5 points) Tyler is interested in how different environments affect dandelion plants. For a science fair project, Typer looks for dandelions growing in the grass and growing in dirt without grass. He counts the number of days it takes each dandelion to turn from a yellow flower to seeds. After 6 weeks, he compares the number of days it takes for the dandelions growing in the grass to turn from a yellow flower into seeds to the number of days it takes for the dandelions growing in the dirt without grass to turn from a yellow flower into seeds. What type of study is Tyler designing? BIUS'S Question 7 (5 points) What is one major difference between an observational study and an experimental study? BI U S'S In Question 8 (5 points) Elena is interested in whether music affects plant growth. For a science fair project, she will grow one plant in a room that is normally kept quiet. She will grow another plant in another room that has classical piano music playing all the time. After 2 months, she compares the height of the plants to determine the effect of music on plant growth. How could Elena's design be improved to collect data that would be better for answering the question of interest? BIUES'S Question 9 (5 points) For Physics class, Jalisa want to know how the surface of different ramps affects the maximum speed of a marble being rolled down the ramp. To study this, she compares the maximum speed of a marble rolled down ramps with different surfaces. She rolls the same marble down each type of ramp 10 times. What type of study is this?Question 10 (5 points) lake is designing a study to determine whether mold grows faster in tap water or bottled water. To do this, he compares the growth rate of mold growing in a glass of tap water to the growth rate of mold growing in a glass of bottled water. How could Jake's design be improved to collect data that would be better for answering the question of interest?09.02 Study Types Questions 1-10 of 10 | Page 1 of 1 Question 1 (5 points) A researcher discovers that the diameter of a person's pupil in thier eye is directly related to how beautiful they find the image they are looking at. The researcher wants to know whether reading an article about climate change influences people's perception of pictures of a city in terms of beauty. 100 people have volunteered to be a part of the study. The researcher's assistants propose 3 options to run the study. The volunteers are shown into an art gallery with the pictures of the city on the wall and the article in a program given to the people when they enter. The researcher will keep track of who reads the program and measure the pupil size of people as they view the pictures. What type of study is described: survey, observational study, or experimental study? BIUES'SIn Question 2 (5 points) What type of study would you conduct if you wanted to know how many miles a week on average students on the school's cross country team un during the summer? Explain your reasoning. BIUS S' S. Q 1 Q Question 3 (5 points) Describe the design of an experimental study that could determine whether you send text messages faster before or after exercise. B IVES'SAn Question 4 (5 points)Question 4 (5 points) A researcher discovers that the diameter of a person's pupil in thier eye is directly related to how beautiful they find the image they are looking at. The researcher wants to know whether reading an article about climate change influences people's perception of pictures of a city in terms of beauty. 100 people have volunteered to be a part of the study. The researcher's assistants propose 3 options to run the study. The volunteers are split into 2 groups by a random process. One group will read the article and the other will not. Everyone will then look at the city pictures and the diameter of their pupil will be measured while they look at the pictures. What type of study is described: survey, observational study, or experimental study? Question 5 (5 points) In an experimental study, it was noticed that people who eat more leafy, green vegetables tend to get better sleep than the general population. Researchers wonder whether the improved sleep might be caused by the minerals potassium and magnesium found in leafy, green vegetables. How could the researchers design an experiment to determine the effects of potassium and magnesium on sleep? BIU E E S'ST n Question 6 (5 points) Select all designs which describe an observational study that is not a survey. 200 voters are randomly selected and asked how they will vote in the upcoming election. O b 60 pieces of lumber are randomly selected. Half of those are randomly assigned to be treated with a new sealer. Three months later the level of rotting in all the pieces is recorded. 100 pregnant women are randomly selected. For 8 weeks, the level of iron in their blood and their vital signs are recorded O d 400 incoming sixth grade students are randomly selected. Researchers record their results on a reading test at the beginning and end of the school year and compare the level of improvement seen in students at elementary schools to students at middle schools. De 30 people apply to test a new mattress. 100 of these customers are selected randomly to receive the new mattress and the others are given an older version. After 6 months they are asked to rate their satisfaction with the mattress.Question 7 (5 points) In an observational study, it was noticed that people that eat more chocolate tend to have better blood flow than the general population. Researchers wonder whether the improved blood flow might be caused by flavanols (a molecule found in many foods). Dark chocolate contains a high concentration fo flavanols, but milk chocolate contains a much lower concentration. How could the researchers design an experiment to determine the effects of flavanol on blood flow from the different types of chocolate? BIUS'S T Question 8 (5 points) What type of study would you conduct if youwanted to knwo how many hours a week on average students at your school spend on homework Explain your reasoning. BIU S' S, Question 9 (5 points) A researcher discovers that the diameter of a person's pupil in thier eye is directly related to how beautiful they find the image they are looking at. The researcher wants to know whether reading an article about climate change influences people's perception of pictures of a city in terms of beauty. 100 people have volunteered to be a part of the study. The researcher's assistants propose 3 options to run the study. The volunteers are split into 2 groups by a random process. One group will read the article and the other will not. Everyone will then look at the city pictures and the diameter of their pupil will be measured while they look at the pictures. The volunteers look at the pictures of thecity and rate how beautiful they find the pictures on a scale of 1 to 10. They then read the aricle and look at the pictuers again, rating them on the same scale. The volunteers are shown into an art gallery with the pictures of teh city on the wall and the article in a program given to the people when they enter. The researcher will keep track of who reads the program and measure the pupil size of people as they view the pictures. Which option should the researcher use? Explain your reasoning. BIUS'SQuestion 10 (5 points) A researcher discovers that the diameter of a person's pupil in thier eye is directly related to how beautiful they find the image they are looking at. The researcher wants to know whether reading an article about climate change influences people's perceptionof pictures of a city in terms of beauty. 100 people have volunteered to be a part of the study. The researcher's assistants propose 3 options to run the study. The volunteers look at the pictures of the city and rate how beautiful they find the pictures on a scale off 1 to 10. They then read the article and look at the pictures again, rating them on the same scale. What type of study is described: survey, observational study, or experimental study