Scientific Method

Sort dependent and independent variables Independent variables are chosen by scientists at the beginning of the experiment and describe the groups scientists will compare during the experiment.Dependent variablesare measured at the end of the experiment. Independent variable Some students had no breakfast, some had yogurt, others, still, had cereal and fruit There were three plots: with flowers. beans and pumpkins Students placed five types of fish in the ponds Researchers used big, small and medium containers for the experiment They chose red, blue and yellow carnations for the experiment Dependent variable Researchers compared how much oxygen had been produced by each plant In October sicentist weighted the pumpkins from all the plots Students measured how much seed were left in the feeders after 3 weeks They counted how many fish survived in the tank They wanted to know who will come to the finish line first Sort examples of constants and control groups Constants are characteristics that stay the same (do not change) during the experimentControl group show the most normal, typical conditions; are used for comparison Control group the most common type of paper the most regularly grown type of pumpkin is the round orange one the most popular type of misic in that area they usually run in the morning Constants each bottle was 16 oz all people in that group were overweight same kind of food every fish tank had 15 gallons of water both plots were 3 square feet What is the independent variable in the graph above? depth of water type of plant number of bubbles amount of time What is the independent variable in the graph above? the type of cereal number of votes What is the dependent variable in the above graph? rainfall in inches the different cities the months What is the independent variable in the data table above? plant groups pH values growth of plant What is the dependent variable in the data table above? water depth water temperature Based on the testable question below identify each part of the experiment. Which increases your heart rate more; walking up and down real stairs of using a stair-master? Type of stairs Independent Variable Heart Rate Dependent Variable Time spent on stairs Constant Based on the scenario below, identify the parts to an experiment. A scientist is interested in studying the effects of nutrition on student performance in school. He predicts that if students eat breakfast before school, then they will earn higher test scores throughout the school day. He designs and experiment with two different groups, one eats breakfast before school each day, the other does not. He then tracks their academic progress. Eating breakfast or not eating breakfast Independent Variable Test scores Dependent Variable The group not eating breakfast Control Group The group eating breakfast Experimental Group Base the next questions on the scenario below: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.What is the independent variable in the experiment? Average Heart Rate Time of Exercise Class Average Rate of Exercise What is the dependent variable in the experiment? Average Heart Rate Time of Exercise Class Average Rate of Exercise Which statement represents a valid conclusion based on the data from the experiment? As exercise intensity increases, heart rate increases. Heart rate increases then decreases over time. Heart rate increases during exercise then decreases after exercise. Exercise causes heart rate to continuously increase. Which of the following would be an appropriate title for the graph? Heart Rate Over Time Heart Rate Before, During and After Exercise Exercise Over Time Heart Rate After Exercise