What is the difference between test and outcome variables in an experiment?

test - what you control, outcome - what changes as result

Which characteristics define a laboratory experiment?

test and outcome variables, data, and controlled conditions

New data doesn't support a currently accepted hypothesis. What should the scientist do?

Form a new hypothesis and plan a new experiment

How could you find the average grade from a graph or table?

Add the data and divide by the total # of data.

What is the best explanation for why theories are modified?

New evidence supports revision and modifications.

Why should scientists be unbiased when investigating theories?

so they can examine research results fairly

What happens when new evidence is discovered that isn't already explained in an existing theory

new theory adapted to account for new evidence

Hypothesis - hot objects cool at constant rates. Which describes the results & the next step?

Hypothesis not supported, revise, design new plan

What is a controlled experiment?

Only one variable is tested or changed.

What source is most credible for effects of food types on human health?

article in professional medical journal by scientist

A person exposes plants to different amounts of sunlight daily. What variable does he control?

amount of sunlight per plant per day

Which statement about scientific investigations is TRUE?

use multiple trials to improve consistency of data collected

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Questions 20

Answers

1
Mendel performed many experiments before developing the theory of inheritance. Evidence used?
data from his experiments
a plan for his experiments
hypothesis proposed by other scientists
a hypothesis he investigated
2
If $200,000 is spent on government operations, how much is spent on community development?
$200,000
$100,000
$300,000
$400,000
3
You are graphing the # of hours you studied and the grade you earned. Test variable is?
# of hours studied
All of the above.
There is no test variable.
grade earned
4
What are visual or mathematical representations that are used to investigate scientific items?
hypotheses
experiments
observations
models
5
What is the difference between test and outcome variables in an experiment?
test - what you control, outcome - what changes as result
test - a number, outcome - never a number
in a table, outcome in 1st column & test in 2nd
outcome - investigator controls, test -what happens
6
Which characteristics define a laboratory experiment?
test and outcome variables, data, and controlled conditions
hypothesis, models, and calculations
data, conclusions, and unregulated environment
test variables, data, and uncontrolled conditions
7
The table shows how a good scientific investigation should be
clear
repeatable
accurate
observed
8
New data doesn't support a currently accepted hypothesis. What should the scientist do?
Change the procedure to obtain the desired outcome
Change the data to fit the hypothesis
Do the experiment until the results support the hypothesis
Form a new hypothesis and plan a new experiment
9
How could you find the average grade from a graph or table?
Divide the data.
Multiply the data and add the total.
Add everything.
Add the data and divide by the total # of data.
10
What is the best explanation for why theories are modified?
Scientists want to prove other scientists wrong.
New evidence supports revision and modifications.
Theories can be out of date.
Too much info is available. Too hard to focus and disprove.
11
Why should scientists be unbiased when investigating theories?
so they can publish their results and become famous
so they can examine research results fairly
so they can pick research results that will make the most $
so they can pick research results that they like personally
12
What happens when new evidence is discovered that isn't already explained in an existing theory
new theory adapted to account for new evidence
new evidence discarded if it doesn't fit
existing discarded, new theory developed
scientists choose sides and support the side
13
Hypothesis - hot objects cool at constant rates. Which describes the results & the next step?
The hypothesis is supported. Present the results to class.
The result is not conclusive. Repeat the experiment.
Hypothesis not supported, revise, design new plan
The hypothesis is supported. Conduct more trials.
14
What is a controlled experiment?
All of the above.
It has more than one test variable.
It has no control variable.
Only one variable is tested or changed.
15
How much more was the annual sales amount in 2011 than in 2010?
$1500
$7500
$5000
$2500
16
25% of students got an A, 25% B, 35% C, 10% D, and 5% F. What grade is represented by green?
D
A
B
C
17
You graph the # of hours studied and the grade you earned. What is the outcome variable?
All of the above
None of the above
grade you earned
# of hours studied
18
What source is most credible for effects of food types on human health?
ad in health section of newspaper
story on internet by food manufacturer
article in professional medical journal by scientist
story in magazine by restaurant critic
19
A person exposes plants to different amounts of sunlight daily. What variable does he control?
time needed to reach a certain height
amount of sunlight per plant per day
rate of plant growth
amount of water per plant per day
20
Which statement about scientific investigations is TRUE?
They follow the same steps - only 1 scientific method
use multiple trials to improve consistency of data collected
They don't involve collecting data in controlled conditions
primary focus rarely includes comparing unregulated world

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