Answers2003350 Chemistry HONORS Sem 1 - MarezThe Nature of Chemistry

Using Math to Analyze Data Answers

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Precision can be defined as the

A
exact center of a data set.
B
reproducibility of a measured value.
C
correlation between two variables that are measured in a data set.
D
agreement between a measured value and an accepted value.
2
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A ruler has markings as shown below. Stefan uses this ruler to measure the length of a metal rod. How many decimal places should his answer include?

Question illustration
A
1
B
2
C
3
D
4
3

Error bars on four different data points are shown below.Which of these data points is the most reliable?

Question illustration
A
point 1
B
point 2
C
point 3
D
point 4
4

In an investigation on accuracy and precision, Myriah measures the mass of a 10.00 g piece of metal several times. Her measurements are 9.98 g, 10.02 g, 10.01 g, and 9.99 g. Which statement best describes her results?

A
They are both precise and accurate.
B
They are neither accurate nor precise.
C
They are precise but not accurate.
D
They are accurate but not precise.
5

Which best describes accuracy?

A
the smallness of the graduations on a measuring tool
B
the reproducibility of a measured value
C
the dependence of a measured value on a controlled value
D
the agreement between a measured value and an accepted value
6

How can one determine the median of a data set?

A
by ordering the data points and finding the middle value of the set
B
by ordering the data points and finding the most common value in the set
C
by finding the average of the different values in the set
D
by finding the difference between the highest and lowest values of the set
7

Rob measures the solubility of three different salts in water at 22°C. Which type of graph should he use to display his data?

A
bar graph
B
line graph
C
histogram
D
scatterplot
8

Which of the following best specifies the purpose of error bars on a graph?

A
to show the mean of a data set
B
to identify the independent variable
C
to give a visual display of measurement precision
D
to indicate the total number of measurements that are made
9

Jose’s lab instructor gives him a solution of sodium phosphate that is buffered to a pH of 4. Because of an error that he made while calibrating the pH meter, Jose’s measurements of the pH of the sodium phosphate solution are 5.4, 5.4, and 5.4. Which statement best describes his results?

A
They are accurate but not precise.
B
They are precise but not accurate.
C
They are both precise and accurate.
D
They are neither accurate nor precise.
10

Which quantity is used to generate the error bars on a graph?

A
range
B
median
C
linear correlation
D
standard deviation

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