AnswersFL-2001340-Environmental Science Sem 1 CRUnit Test

Analyzing Data and Drawing Conclusions Answers

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What is the most important reason to control the conditions of an experiment?

A
to make the experiment easier to repeat
B
to reduce the amount of data that must be recorded
C
because this is necessary for graphing the data
D
because this is necessary for the data to be valid
2
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For a conclusion to be accepted by the scientific community, the data must be accurate, free from error, and

A
reproducible.
B
varied.
C
unique.
D
surprising.
3

What is the most appropriate way to present the data below?Week Plant Mass (g)1222613874123

A
bar graph
B
chart
C
line graph
D
pie graph
4

How does a good experimental conclusion differ from an inference?

A
A conclusion relates the evidence to the hypothesis and inference is a guess.
B
A conclusion explains data and an inference predicts what will occur next.
C
A conclusion provides less information to the reader than an inference.
D
A conclusion is proven to be correct; an inference is disproved by evidence.
5

Francis was recording plant heights for an experiment. Each time that she took a measurement, she wrote it down. Then, she measured the plant again and compared the new measurement to the one that she had recorded in her notebook. What was she most likely trying to do?

A
revise her hypothesis
B
check her memory
C
make the data more valid
D
form a conclusion
6

Maria wanted to learn more about the birds that visit her backyard. She installed several bird feeders and offered a variety of bird seed mixes in order to attract a mix of species. For a month, she observed the bird feeders three times a day for an hour each day and counted the types of birds that she saw. Then, she made a pie chart to represent her findings. What is the most likely reason that she chose a pie chart?

A
To show the total number of birds that she observed.
B
To show the number of times that each bird visited the feeders.
C
To show which bird species were most common.
D
To show how the bird species changed over time.
7

A geologist and a biologist performed an experiment together and examined the data. Each scientist formed a different conclusion. Both conclusions were supported by the evidence. How is this possible?

A
Both conclusions are the same but have different wording.
B
If more than one conclusion is supported, the hypothesis is invalid.
C
There can be alternate explanations for the same evidence.
D
Each conclusion is based on different data.
8

Denise was measuring the effect of temperature on the amount of dissolved oxygen that water can hold. She hypothesized that as water temperature increases, the amount of oxygen that is dissolved in water increases. Her data are shown in the table below.Water temperature (ºC)Dissolved oxygen (mg/L)512.51011.01510.2209.1258.3Which conclusion did Denise most likely write in her lab report?

A
The data did not support the hypothesis because the amount of dissolved oxygen decreased as water temperature increased.
B
The data did not support the hypothesis because the amount of dissolved oxygen increased as water temperature increased.
C
The data supported the hypothesis because the amount of dissolved oxygen decreased as water temperature increased.
D
The data supported the hypothesis because the amount of dissolved oxygen increased as water temperature decreased.
9

Mario performed an experiment to determine if photosynthesis was affected by the amount of light that a plant received. The data from his experiment are shown in the table below.Amount of light(hours)Number of plantsAverage volume of oxygen produced (mL)1 40.50642.01045.0What could he have done to increase the validity of his data?

A
Reduce the number of plants.
B
Remove the 1 hour group.
C
Add a 0 hours control.
D
Measure the oxygen in liters.
10

A good conclusion restates the hypothesis so that the reader

A
does not have to return to the beginning of the report.
B
sees how the scientist applied the results to the hypothesis.
C
understands how the methods relate to the hypothesis.
D
recognizes that the hypothesis was correct.

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