Week 1

# Week 1 - -Average – measure of central tendency-3 3 4 2 3...

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Week 1 – M&P Data Handling and Measurement Data collection: - Determine if everything is set up properly - Ex. Asked to determine a shutter speed with aperture set at f/8 o Confirm that f/8 setting prior to determining shutter speed Recording data: - Measure what is being asked for - Asked for cm, measure cm, not inches or mm - Measure twice, record once. Data: - 2, 4, 3, 6, 8 - What? - Units are required, EVERYWHERE AND ALL THE TIME - No units, no points Scatter Plot: - Drawing on screen - Need labels on X-axis, Y-axis, and title - Need a key if more than one point (ex: X, Y1, Y2) - (XY) Scatter Plot – Excel. Always use. Reading data from Chart: - Important skill to have Histogram: - Diagram that illustrates the frequency of which something occurs - Ex. How many students took a particular subject in high school? - First, collect data. Then, create a table. Make chart. - Cumulative histograms – multiple groups Graphing Summary: - Label everything - X-axis, Y-axis - Include units if appropriate - Legend if needed - Title if appropriate

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Unformatted text preview: -Average – measure of central tendency-3, 3, 4, 2, 3, 2, 3, 1, 4, 5-Mean = total of all/# of numbers-Mean in example = 10 Percent Error:-How different is the observed value from the true value-% error = (observed value – true value)/true value x 100 = -True value – 1/500 th sec.-Observed value = 1/450 th sec-% error = (1/450 – 1/500)/ 1/500 x 100 = 11% Percents and Weights:-Homework: 50% - 80-Exam 1: 10% - 70-Exam 2: 10% - 60-Final: 30% - 75 80 x .5 70 x .1 60 x .1 75 x .3 75.5 = C-Study harder! Ratio:-The proportional amount of one quantity in relationship to another-Ex: H2O – ratio of hydrogen to oxygen is 2:1-8 oreos to 4 oreos – 8:4. Simplify to 2:1 Logarithms:- We use log H (exposure) often-With logs we can add and subtract rather than multiply or divide-To take log of a number. log(100000) = 5-Inverse log: 10^5 = 100000 Plot Comparison:-Log graphs are easier to read when the numbers are extremely small....
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