Review: Variable & Hypothesis Practice

Determine which statements have a quantitative and which have a qualitative independent variable. Qualitative Data The leaves on the second plant specimen were green, while the leaves on the first plant specimen were turning brown. The patient complained of aches and pains. The parrots range from bright green to dark red. The dogs were small The rock sample was reddish brownish. The leaves on the first plant specimen appeared healthier. The birds were young. The sample with the baking soda appeared bubbly. Quantitative Data The balloon increased in size from five inches to eight inches around. The first plant specimen had 3 more leaves than the second specimen. The gummy worm increased by 2 inches. The chimp identified 12 pictures correctly. There were four dogs in the group. The sample contained 3 different types of bacteria. The rock sample consisted of 25 grams of quartz. The patient had a temperature of 102 degrees. You decide to see if growing plants in blue light makes plants grow faster than growing them in white light. You get two plants that are the same size and type. You plant them in the same size pot, with the same soil. You water them the same amount of water on the same day. The two plants get the same amount of light. However, plant A gets 12 hours of white light and plant B gets 12 hours of blue light. After 5 weeks, you measure both plants; plant A is taller than plant B. Match the type of variable to the parts of the experiment. Blue and White light Experimental Groups Light Color Independent Variable Hours of light Constant Plant height Dependent Variable Will a higher calorie lunch give an 8th grader more energy? Match the type of variable to the parts of the experiment. Calories consumed Independent Variable Amount of energy Dependent Variable 300 Calorie, 600 Calorie, or 900 Calorie lunch Experimental Groups Grade level of student Constant What is the best hypothesis for the following experimental question:Does T.V. time seem to affect the reading scores of fourth graders? I think watching more T.V. will lower 4th grade reading scores because the students are not developing their reading comprehension skills. If a 4th grader watches more than three hours of T.V. daily, then reading scores will not be impacted. If the amount of T.V. a 4th grader watches increases, then their reading scores will decrease. What is the best hypothesis for the following experimental question:Does the color of light impact plant growth? If blue and white light are applied to plants, then the plant grown in blue light will grow taller. If blue and white light are applied to plants, then the color of light will impact plant growth. I think blue light will impact plant height. If the height is applied to the plant, then the color will change. Fill in the blanks for the correct format of a hypothesis statement: Students wanted to see if increasing the angle of a piece of wood would affect the speed of the car. They created this hypothesis:If the angle of the board increases, then the speed will increase. The students wanted to test to see which type of ball would bounce the farthest. They used a baseball, tennis ball, and golf ball. Their hypothesis is:If the baseball, tennis ball, and golf ball are bounced, then the tennis ball will bounce the farthest. What is the format of a hypothesis? If the IV increases, then the DV will (increase or decrease) Matching Match the following to their correct descriptions. Dependent variable Y-axis Independent variable X-axis Control group Normal group Experimental group Group that gets experimented on Constants Possible variables that remain the same for each group throughout the experiment.