Scientific Method ReviewRun this PPT show to help you review for your midterm.

The problem of an experiment is in the form of a ____.

Question

A ______ is an educated guess to the problem of the experiment.

Hypothesis

The ___________ states whether your hypothesis is correct or incorrect.

conclusion

What would make the results of an experiment carried out by a research team valid?

The experiment was repeated and the same results were obtained eachtime.

The _______ group does not contain the independent variable.

control

What is measured is known as the ______ variable.

dependent

A newidea that is tested in a scientificexperiment is known as the ________.

hypothesis

The current knowledge about cells is the result of themany experiments and observations of many scientists. The work of these scientists forms a well-accepted body of knowledge about cells. This body of knowledge is an example of a _____.

theory

To test the effect of hormones on plant growth, 6 potted plant seedlings of the same species were measured and then sprayed with a growth hormone. After 4 weeks of growth under ideal conditions, the plants were measured again. How would you set up the control group?

There should be another group with 6 plants that DO NOT receive water.

To test the effect of hormones on plant growth, 6 potted plant seedlings of the same species were measured and then sprayed with a growth hormone. After 4 weeks of growth under ideal conditions, the plants were measured again. 2. Identify the independent and dependent variables.

Independent variable: Growth hormoneDependent variable: Length of the seedling

To test the effect of hormones on plant growth, 6 potted plant seedlings of the same species were measured and then sprayed with a growth hormone. After 4 weeks of growth under ideal conditions, the plants were measured again. 3. Give 2 factors that must be kept constant.The amount of water each plant receives.The temperature the plants were kept.The species of plant used.The amount of soil in each pot.

5 10 15 20 25 30 3520406080100120140160180200220240260280Identify the independent variable.

Water temperature

Identify the independent variable.

Average water flea heart rate

5 10 15 20 25 30 3520406080100120140160180200220240260280State the relationship between the average water flea heart rate and water temperature.

As water temperature increases, the average water flea heart rate increases.

5 10 15 20 25 30 3520406080100120140160180200220240260280What is the average flea heart rate at 15C?

118 beats/min

What is the average flea heart rate at 30C?

240 beats/min

The results of one experiment carried out by a research team would be considered valid if1. the experiment had no control setup 2. all the members of the research team came to the same conclusion 3. the experiment had more than one variable 4. the experiment was repeated and the same results were obtained eachtime

Why do scientists make graphs of data from experiments?to observe general trends and patterns in the data to make the observed data more accurate to prevent errors in measuring data to help change the original data tables

Which is the dependent variable in Amelia's experiment?the number of bean plants in each group the amount of water given daily to each plant the height of each bean plant the amount of fertilizer given to each group of bean plants

A newidea that is tested in a scientificexperiment is known as a(an)theory hypothesis inference observation

Which statement about the use of independent variables in controlled experiments is correct?A different independent variable must be used each time an experiment is repeated. The independent variables must involve time. Only one independent variable is used for each experiment. The independent variables state the problem being tested.

An investigation is carried out to determine the effect of exercise on the rate at which a person can squeeze a clothespin.In this investigation, the independent variable is thecontrol exercise rate of squeezing number of participants

An investigation is carried out to determine the effect of exercise on the rate at which a person can squeeze a clothespin.In this investigation, the dependent variable is thecontrol exercise rate of squeezing number of participants

Why do scientists consider any hypothesis valuable?A hypothesis requires no further investigation. A hypothesis may lead to further investigation even if it is disproved by the experiment. A hypothesis requires no further investigation if it is proved by the experiment. A hypothesis can be used to explain a conclusion even if it is disproved by the experiment.