Scientific Method HW (1)

In the pillbug experiment, it is important that measurements be taken twice: once at the beginning of the experiment, and once at the end of the experiment.

False. In order to have enough data to graph and draw conclusions, it is important that you take several measurements at regular intervals throughout the experiment.

Place the four phases of the scientific method in order.

Hypothesis Experiment Analysis Report

In the pillbug experiment, if the pillbugs in the experimental chamber would have moved to the side of the chamber with sand instead of cornstarch, what would you have concluded?

Pillbugs tend to prefer sand over cornstarch.

Some students consume large amounts of coffee and so-called energy drinks to help them stay alert when studying. You notice that many who engage in this practice seem to do poorly on exams. Suppose you want to investigate the relationship between caffeine consumption and exam performance. Which of the following statements would be an appropriate hypothesis?

Students who consume large amounts of caffeine while studying will have lower exam scores than those who consume less caffeine.

Imagine that you wish to compare two different diets that will be fed to tadpoles raised in a lab. One diet is a meat-based fish food, and the other is the traditional diet of boiled lettuce. You want to see if the meat-based diet will be associated with an increase in the average weight of the tadpoles. In your experiment you keep all other factors, such as tadpole density per pan, temperature, pH, and the amount of food the same. The only difference between your control and experimental groups is the type of food the tadpoles receive. Which is a good hypothesis for this tadpole experiment?

Tadpoles will be larger if fed a meat-based diet.

When utilizing the scientific method, there are two types of variables. They are

dependent and independent.

Imagine that you wish to compare two different diets that will be fed to tadpoles raised in a lab. One diet is a meat-based fish food, and the other is the traditional diet of boiled lettuce. You want to see if the meat-based diet will be associated with an increase in the average weight of the tadpoles. In your experiment you keep all other factors, such as tadpole density per pan, temperature, pH, and the amount of food the same. The only difference between your control and experimental groups is the type of food the tadpoles receive. What is the independent variable for the tadpole diet experiment?

diet

In the pillbug experiment, your hypothesis

was related to the environment pillbugs prefer.

In the pillbug experiment, how many pillbugs did you need to use to get good information for the experiment?

10

If you wanted to test whether or not a particular pain reliever was effective in the general population, you would need to design an experiment with an experimental group and a control group. What should be the only difference between these two groups?

Treatment: The experimental group should get the pain reliever, and the control group should get a placebo

When determining the scope of an experiment, you need to consider (Select all that apply)

Which data you will collect and plot.which data you will collect and plot. The outcome you will investigate.the outcome you will investigate. What results to report.what results to report. The factor that will vary.

false

You do not need to pause to record your data as you perform your experiment. You can go back and estimate the values when the experiment is complete.

true

You should use the graph generated from your data to see if your hypothesis is supported. Group starts

After a period of time, most of the pillbugs appeared to spend most of their time on the side of the dish with sand, not cornstarch.

false

If the hypothesis in a scientific experiment is not supported, the experiment is considered a complete failure and must be repeated until a satisfactory outcome is reached.

false. If a hypothesis is not supported, you have still learned important information form the experiment. That information should be recorded and shared in the report phase

In the pillbug experiment, an important part of the experimental strategy was to

make observations at regular intervals.

According to the results of the pillbug experiment,

pillbugs tend to prefer cornstarch over sand.Correct

When graphing your data, it is important to

place the dependent variable on the Y-axis.

When graphing your data, it is important that you

place the independent variable on the X-axis.

In the pillbug experiment, the substance used as the control was

sand.

There are two, two-sided dishes in the pillbug experiment. In one dish, you should have placed sand in both sides. In the other dish, you should have placed ______ in one side and ______ in the other.

sand; cornstarch

In order to come to reliable conclusions about pillbug preferences, you needed to use the

scientific method.

Before you begin a scientific experiment, you should (Select all that apply)

state a hypothesis, decide on a strategy.