unit 1 hw - scientific method 2017-18

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Dec 6, 2023

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Unit 1 – Scientific Method HW Packet Name of Assignment Type of Assignment Completed HW #1.1: Intro to Scientific Method Castle Learning HW #1.2: Controlled Experiment Paper Assignment HW #1.3: Measurement Castle Learning HW #1.4: Graphing Paper Assignment Reminder: Never forget a HW! Sign up for the Remind texts today! J Castle Learning Log in Info Username: Password: Name:

Name: Date: CL HW #1.1: Intro to the Scientific Method 1. Which activity would be an appropriate first step when designing an experiment? 1. reporting a conclusion based on multiple experimental trials 2. researching the problem, using information from a variety of sources 3. creating a data table to organize experimental observations 4. repeating the experiment with a different hypothesis 2. In an experiment to determine the effect of exercise on pulse rate, a student checks his pulse rate before and after exercising for several minutes. The purpose of checking his pulse rate before exercising is that it 1. serves as the conclusion for the experiment 2. is needed to justify the sample size 3. serves as a control for the experiment 4. is needed to formulate a hypothesis 3. Students were asked to design a lab that investigated the relationship between exercise and heart rate. Heart rate was determined by recording the pulse rate in beats per minute. The students hypothesized that increased exercise results in an increased heart rate. The class results for the experiment are shown in the graph below. Students in a different science class carried out the same experiment. The data they obtained did not support the hypothesis that increased exercise results in increased heart rate. The most scientifically sound way to deal with this situation is to 1. write a new hypothesis 2. read about pulse rate in a biology textbook 3. have the students in both classes vote to decide which hypothesis is correct 4. ask students in a third class to do the experiment and see if their results support the hypothesis 4. An experiment was designed to test whether students could squeeze a clothespin more times in 1 minute after resting or after exercising. What would be a hypothesis for the experiment?

1. Do students squeeze clothespins more often in 1 minute after exercising? 2. Can most students squeeze a clothespin more times after they rest? 3. Ten students who exercise before squeezing a clothespin squeezed it more times in 1 minute than ten students who rested first. 4. Students who rest before squeezing a clothespin will squeeze it fewer times in 1 minute than students who exercise beforehand. 5. Five students design an experiment to answer the question: “How is heart rate affected by running?” Two chairs were set up at different ends of a large room. The pulse rate of each student was taken at rest just before running. Each of the five students ran between the chairs a different number of times. Their pulse rates were taken after running and the results are shown in the table below. If a control group is not included in an experiment, it would be difficult to 1. formulate a hypothesis for the experiment 3. record data in a data table 2. make observations about the experimental group 4. draw a valid conclusion Base your answer to questions 6-8 on the information below and on your knowledge of biology. An experiment was designed to test whether students could squeeze a clothespin more times in one minute after resting or after exercise. 6. The experimental results could be made more valid by 1. increasing the number of students 3. using a plastic clothespin 2. using safety precautions 4. making a bar graph of the data 7. In this investigation, the independent variable is the 1. control 2. Exercise 3. rate of squeezing 4. number of participants 8. The dependent variable for this experiment is the 1. time the student was squeezing the clothespin 2. number of times the student was able to squeeze the clothespin 3. strength of the student 4. length of the clothespin 9. A company that manufactures a popular multivitamin wanted to determine whether their multivitamin had any side effects. For its initial study, the company chose 2000 individuals to take

one of their multivitamin tablets per day for one year. Scientists from the company surveyed the participants to determine whether they had experienced any side effects. The greatest problem with this procedure is that 1. only one brand of vitamin was tested 2. the study lasted only one year 3. the sample size was not large enough 4. no control group was used 10. A student conducted an experiment to determine if listening to different types of music would affect pulse rate. She thought that pulse rate would change with different types of music. Each person participating in her experiment listened to seven different selections of music for 30 seconds each. The pulse rates were taken after each 30-second interval of music. Based on her experiment, the student concluded that a person’s pulse rate changed when listening to different types of music. The component missing from this experiment is a 1. prediction 2. hypothesis 3. control group 4. research plan Note : Due to the fact that the online version is random, there is not self-assessment provided. Please feel free to evaluate each question, however, using the codes below to assess your current knowledge. 4 – Exceeds : I can do it without mistakes. I can help others. 3 – Proficient: I can do it by myself. I make very few mistakes. 2 – Developing: Sometimes I need help. I am starting to understand. 1 – Novice: I can’t do it by myself. I don’t understand yet .

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