EXAMPLE: A student wants to measure the absorbency of paper towels,so absorbency is the variable.The students must create an operational definition for measuring the absorbency of paper towels.He develops three possible operational definition.
-The dunk:Measure the amount of water that remains after a crumpled paper towel has been placed in 25 ml of water for five minutes.
-The pour:Measure the amount of water that collects after 25 ml of water has been poured through a crumpled paper towel.
-The lift:Measure the height that water reaches after the end of a folded paper towel has been inserted in water for 15
ANSWER THE ACTIVITY BELOW.
Think of operational definition that might be used to measure variables in the following situations.
1.A student is interested in magnets.He wants to measure the strength of his favorite magnet.Operational definition of the variable"magnet strength".
2.A student is interested in investigating the germination (spouting) of seed.Operational definition of the variable"germination".
3.A student want to measure which soft drink her classmate prefer.Operational definition of the variable"soft drink".
4.A student wants to find out how interested her classmates are in reading books about science.Operational definition of the variable"interested in reading books about science".
5.A student wants to find out if study affects science grades.Operational definition of the variable"study".
Operational definition of the variable "science grade"
i will follow who answer this and thank you to you
plss answer
Answers
1. This lesson is the second in a two-lesson series on magnets. Students should carry out many investigations in order to familiarize themselves with the pushes and pulls of magnets. By exploring magnets, students are indirectly introduced to the idea that there are forces that occur on earth which cannot be seen. This idea can then be developed into an understanding that objects, such as the earth or electrically charged objects, can pull on other objects. It is important that students get a sense of electric and magnetic force fields (as well as gravity) and of some simple relations between magnetic and electric currents (Benchmarks for Science Literacy, p. 93.) In later years, students will learn about gravitational force and how electric currents and magnets can exert a force as
2. Germination occurs when a spore or seed starts to grow. It is a term used in botany. When a spore or seed germinates, it produces a shoot or seedling, or (in the case of fungi) a hypha.Such five changes or steps occurring during seed germination are: (1) Imbibition (2) Respiration (3) Effect of Light on Seed Germination(4) Mobilization of Reserves during Seed Germination and Role of Growth Regulators and (5) Development of Embryo Axis into Seedling.
3. In a meta-analysis of 88 studies, we examined the association between soft drink consumption and nutrition and health outcomes. We found clear associations of soft drink intake with increased energy intake and body weight. Soft drink intake also was associated with lower intakes of milk, calcium, and other nutrients and with an increased risk of several medical problems (e.g., diabetes).
In a meta-analysis of 88 studies, we examined the association between soft drink consumption and nutrition and health outcomes. We found clear associations of soft drink intake with increased energy intake and body weight. Soft drink intake also was associated with lower intakes of milk, calcium, and other nutrients and with an increased risk of several medical problems (e.g., diabetes).Study design significantly influenced results: larger effect sizes were observed in studies with stronger methods (longitudinal and experimental vs cross-sectional studies). Several other factors also moderated effect sizes (e.g., gender, age, beverage type). Finally, studies funded by the food industry reported significantly smaller effects than did non–industry-funded studies. Recommendations to reduce population soft drink consumption are strongly supported by the available science.
4. please find this answer
5. The dependent variable is the variable that is being measured or tested in an experiment. For example, in a study looking at how tutoring impacts test scores, the dependent variable would be the participants' test scores, since that is what is being measuredIn a science experiment, only one variable is changed at a time (the independent variable) to test how this changes the dependent variable. The researcher may measure other factors that either remain constant or change during the course of the experiment but are not believed to affect its outcome.