Understanding Precision, Accuracy, and Reliability in Investigative Biology

 
Investigative Biology
Ensuring Reliability
 
Turnbull High School
Advanced Higher Biology
Unit 3
P100-101
 
Miss A. Aitken
 
 
 
Precision
 
Precision is a measurement of the closeness of
two or more measurements taken from the
same sample.
 
For example, if you measured the volume of a
solution 10 times and get 10ml exactly every
time, then your measurements are 
precise.
 
Miss A. Aitken
 
Accuracy
 
Accuracy is an assessment of how close your
measurement is to the actual value.
 
For example, if you measure the volume of a
solution you know is 100ml and get 90ml,
your measurements are not accurate.
 
Accuracy is assessed by calibration against a
known standard.
 
Miss A. Aitken
 
Precision and Accuracy
 
A student took a buffer, which she knew was
pH 7, and measured the pH 4 times. The
results she got are below:
 
 
 
These results are precise but not accurate.
 
Miss A. Aitken
 
Replicates
 
Two types:
 
Replicates are multiple measurements within
the same experiment. You take many
measurements and calculate an average
 
Independent replicates are when the whole
experiment is repeated again to demonstrate
results are reliable and consistent.
 
Miss A. Aitken
 
Analysing Data
 
Two things to understand:
 
 
- What error bars show
 
- What a confidence interval is
 
Both of these can be found on page 101 of the
textbook.
 
Miss A. Aitken
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Precision, accuracy, and replicates play crucial roles in ensuring reliable results in investigative biology experiments. Precision refers to the closeness of measurements, accuracy to how close they are to the actual value. Replicates involve multiple measurements within the same experiment or repeating the whole experiment for consistency. Analyzing data involves understanding error bars and confidence intervals for a comprehensive interpretation. Explore more in Turnbull High School's Advanced Higher Biology Unit 3 with Miss A. Aitken.


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  1. Investigative Biology Ensuring Reliability Turnbull High School Advanced Higher Biology Unit 3 P100-101 Miss A. Aitken

  2. Precision Precision is a measurement of the closeness of two or more measurements taken from the same sample. For example, if you measured the volume of a solution 10 times and get 10ml exactly every time, then your measurements are precise. Miss A. Aitken

  3. Accuracy Accuracy is an assessment of how close your measurement is to the actual value. For example, if you measure the volume of a solution you know is 100ml and get 90ml, your measurements are not accurate. Accuracy is assessed by calibration against a known standard. Miss A. Aitken

  4. Precision and Accuracy A student took a buffer, which she knew was pH 7, and measured the pH 4 times. The results she got are below: Attempt 1 2 3 4 Reading pH 6.8 pH 6.7 pH 6.8 pH 6.7 These results are precise but not accurate. Miss A. Aitken

  5. Replicates Two types: Replicates are multiple measurements within the same experiment. You take many measurements and calculate an average Independent replicates are when the whole experiment is repeated again to demonstrate results are reliable and consistent. Miss A. Aitken

  6. Analysing Data Two things to understand: - What error bars show - What a confidence interval is Both of these can be found on page 101 of the textbook. Miss A. Aitken

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