Distribute materials to each work station. One hour before the lab: Fill the ice chest with crushed ice. Heat water if hot tap water is not available. A large flask of water should be fine for the entire class.
We also provide a few objects of unknown mass, volume, and dimensions for the students to measure. The class results are put on the board, collated, and the variation is discussed. Comparison shopping at the following scientific companies might save you money on some supplies: o.
Safety first: Be sure and cover any safety issues that may be specifically related to this lab procedure. Can measurements be accurate but not precise? Can measurements be precise but not accurate? Make the following conversions. What are some potential sources of error in your measurements? What volume of liquid did you measure? Variable a. Density is mass per unit volume. What is the density of the wooden pencil?
Does it float? Because wood is less dense than water, the pencil will float. The density of the pencil will vary. What is the density of the rock? Does it sink? Because the rock has a higher density than water, it will sink. The exact density of the rock will vary. Why or Why not? No, because the mean can be dramatically affected by a single, extreme atypical measurement.
And, the mean may be calculated to a portion of a single unit; i. What information about a sample does a mean not provide? It does not provide information about variation, range, and extremes on either side of the mean.
What is responsible for this difference between the mean and median? The distribution of numbers throughout the range is uneven. How would the median change if the 9-mm-long leaf was not in the sample? The median would not change. How would the mean change if the 9-mm-long leaf was not in the sample? The mean would change from Consider these samples. What is the mean for sample 1? Sample 2? Could two samples have the same mean but different ranges?
Yes, the mean does not reflect the distribution of sample values. Could two samples have the same range but different means? Yes, uneven distributions of numbers within the same range could produce different means. What does your calculation tell you? Conclusions vary males usually taller than females, range for males usually greater than range for females, etc.
What are the limitations of your sample? Questions for Further Thought and Study 1. What are the advantages and disadvantages of using the metric system of measurements?
Base 10 of units, easy to convert between scales. Unfortunately many scientists and businesses are in countries using the English standards of units and measurement scales. Why is it important for all scientists to use a standard system of measures rather than the system that may be most popular in their home country or region? Good science must be repeatable. Standards assist scientists from different countries who are working together to repeat investigations.
Their cooperative effort and repetition of the experiments strengthen the validation of the results. Do you lose or gain information when you use statistics to reduce a population to a few characteristic numbers? Fewer examples in regulation, greater the rise of detecting a difference when none really exists. One loses information. Suppose that you made repeated measurements of your height. If you used good technique, would you expect the range to be large or small?
Repeated measures improve technique and thus improve precision and accuracy. Suppose that a biologist states that the average height of undergraduate students at your university is cm plus or minus a standard deviation of 17 cm.
What does this mean? The mean value is cm. Biology I Laboratory Manual PDF To share these files with your students, copy and paste the text and download link above into a page or announcement in your learning management system Blackboard, Canvas, etc. To clarify, this is the test bank, not the textbook. The twelfth edition of Biology is a traditional, comprehensive introductory biology textbook, with coverage from Cell Structure and Function to the Conservation of Biodiversity.
Author: Elaine N. Buy, rent or sell. The coursework, lecture and lab, are designed to provide the student with a wide range of information about living organisms and systems. Microscope labels; Mitosis Index. RossmanEnvironmental Scientist Emeritus, U. When submitting your lab report, use only the PDF format.
The laboratory meets once a week for 3 hours. You might not require more become old to spend to go to the book inauguration as skillfully as search for them. Recognize themes in the study of life. CCNY faculty are. Give me twenty minutes and then move in. If you hear shooting, break into the house. The entrance to where I am now is in the big front room with the casement windows leading to the terrace.
The door is on the left-hand side as you enter the casement windows. Its concise, precise writing-style employs lucid language to present the material as succinctly as possible, enabling students - even non-majors - to master the foundational concepts before coming to class.
Someone may hear it from the waterfront. Identify your control and experimental groups. Remember to keep the single variable difference between your control and experimental groups, and specify how you will analyze your data. What would be an appropriate way to graphically represent your data?
He kept them in a thick book, covered in genuine Moroccan leather. He opened it familiarly but at random, eyes not immediately focusing on the words. Just the weight of the book, he told himself, trying to concentrate upon the account again but finding it difficult because of another intrusive thought.
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