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Lecture

# Bio lab 13 Feb 12 2010

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Department
Biology
Course
BIO120H1
Professor
Ingrid L.Stefanovic
Semester
Winter

Description
Bio lab 13 Measurment error reflects the discrepancy between our repeated measurment and the ture value of the object being measured. Precision and accurancy: Precision J is the repeatability of the measurement. If a single measurement when repeated shows little little variation, it ahs high precision, if it shows great variation, it has low precision Accurancy J is the tendency for the measured value to be close to, or apporximate, the true accepted value. Significant figures~ Measurement contain three parts J unit, scale factor and significant figures Scientific notation~ Rounding numbers: Less than 5 unchange~ Larger than 5 roung up 5 J before is even J unchange odd J roung up Organized data: Qualitative: such as hair colour, sex or something something are easy to group Quantitative J discrete and continuous Use a table or a figure to presenting data Dependent variable plot on y-axis, and independent variable plot on x-axis Line of best fit: a line which travels through the space pccupied by most of the points Interpolation: line of best fit allow us to predict the data that is not one of the plot points Extropolation: extending the line beyond the existing data J provide the base for prediction Bar graph J used for discrete data Historgram J used for continuous data Statistics of location: describe the position of a sample along a given dimension. Most common statistics location J mean, median and mode
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