AnswersFL-2003010-MJ Physical ScienceExperimental Design Principles

Experimental Design Principles Answers

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1
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What is 18,000 expressed in scientific notation?

A
1.8 × 10–4
B
1.8 × 104
C
1.8 × 10–5
D
1.8 × 105
2
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A scientist conducted one trial of an experiment and got unexpected results. How can the scientist increase confidence in the results?

A
by repeating the experiment several times
B
by changing the experimental procedure
C
by asking other scientists what they think about the results
D
by modifying the results so they are close to the expected results
3

When 560,000 is written in scientific notation, what is the power of 10?

A
4
B
5
C
6
D
7
4

Renald completed only one trial of his experiment. What effect will this most likely have?

A
The results are more likely to have errors.
B
The results are more likely to be precise.
C
The experiment will be harder to replicate.
D
The experiment will be easier to replicate.
5

Which best explains why replicating an experiment should be done by someone other than the person who originally did the experiment?

A
It shows that the results are the same using different methods.
B
It shows that the experiment is easy to do.
C
It shows that the results are as expected.
D
It shows that the experiment is designed properly.
6

What are two main purposes for using repetition when conducting experiments?

A
recording data easily and saving time
B
increasing confidence in results and recording data easily
C
reducing mistakes and increasing confidence in results
D
saving time and increasing confidence
7

Why is scientific notation used?

A
to round numbers to the nearest whole number
B
to promote reproducibility of data
C
to increase the validity of data
D
to express very large or very small numbers
8

Which describes the best approach when conducting a scientific experiment?

A
conduct repeated trials and make sure the experiment can be replicated
B
conduct a single trial and make sure the experiment can be replicated
C
conduct repeated trials and make sure the experiment cannot be replicated
D
conduct a single trial and make sure the experiment cannot be replicated
9

Which set of data is best described as accurate and precise when compared to an accepted value of 125?

A
130, 125, 109, 210
B
122, 126, 121, 123
C
125, 100, 109, 200
D
190, 190, 191, 192
10

What does it mean if an experiment exhibits reproducibility?

A
The experimental conditions are simple and do not require a lot of materials.
B
The experimental conditions are always kept the same.
C
The results of the experiment are always accurate.
D
The same results are expected each time the experiment is done.
11

A scientist conducted an experiment and discovered that certain plants grow faster when given a particular amount of fertilizer. Another scientist conducted the same experiment and got similar results.

A
repetition
B
replication
C
precision
D
validity
12

Maya tried to hit four golf balls into a hole marked with a flag. The diagram shows where the golf balls landed.

Question illustration
A
high precision, low accuracy
B
low precision, high accuracy
C
high precision, high accuracy
D
low precision, low accuracy
13

What does it mean if data are reproducible but not accurate?

A
The data can be produced over and over but are not close to the accepted value.
B
The data are close to the accepted value but cannot be produced over and over.
C
The data are close to the accepted value and are close to one another.
D
The data are close to the accepted value but are not close to one another.
14

Which two characteristics of data always occur together?

A
high accuracy and high precision
B
high precision and good validity
C
low accuracy and low precision
D
low accuracy and good validity
15

What is 6.9 × 107 written in standard form?

A
0.00000069
B
0.000069
C
6,900,000
D
69,000,000

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