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Take out Work from Yesterday & leave it on your desk

Take out Work from Yesterday & leave it on your desk

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Take out Work from Yesterday & leave it on your desk

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  1. Take out Work from Yesterday & leave it on your desk Female silkworm moths attract males by emitting chemical signals that spread through the air. A male hundreds of meters away can detect these molecules and fly toward their source. The sensory organs responsible for this behavior are their comb-like antennae. Each filament of the antennae is equipped with thousands of receptor cells that detect the sex attractant. • propose a hypothesis to account for the ability of the male moth to detect a specific molecule in the presence of many other molecules in the air • Describe predictions your hypothesis enables you to make • Design an experiment to test one of your predictions

  2. A) propose a hypothesis to account for the ability of the male moth to detect a specific molecule in the presence of many other molecules in the air A hypothesis is a tentative, testable answer to a scientific question. Once a scientist has a scientific question she is interested in, the scientist reads up to find out what is already known on the topic. Then she uses that information to form a tentative answer to her scientific question. The hypothesis has to be testable since the next step is to do an experiment to determine whether or not the hypothesis is right!  • Is it testable? 1 point

  3. B) Describe predictions your hypothesis enables you to make Predictions often take the shape of "If ___then ___" statements, but do not have to. Predictions should include both an independent variable (the factor you change in an experiment) and a dependent variable (the factor you observe or measure in an experiment). A single hypothesis can lead to multiple predictions, but generally, one or two predictions is enough to tackle for a science fair project. • Includes 2 or more predictions (1 point) • (Includes an independent and a dependent variable labeled appropriately) [1 point]

  4. C) Design an experiment to test one of your predictions • State the control group. • State the independent (experimental) and dependent (measured) variable(s). • Identify other variables being held constant. (amount of time, temperature, etc.) • State how and when data will be collected or observations made. (measure mass every 3 minutes) • State what calculation will be used. (average 3 values for mass, write out formulas used) • State how you will be confident in your results. (repeat trials, using a large sample size, etc.) • State how you will share your results. (tables, graphs, drawings, etc.) • State what you expect to happen and why. (based on the hypothesis, what would you expect?)

  5. Terminology • What is a Null Hypothesis? the hypothesis that there is no significant difference between specified populations, any observed difference being due to sampling or experimental error. Example: Increasing caffeine consumption would have no effect heart rate. • What is an inference?  a conclusion reached on the basis of evidence and reasoning; an educated guess due to prior knowledge/ experience

  6. Graphing • Which variable goes on the x-axis? the independent • Which variable goes on the y axis? the dependent • MAKE SURE TO ALWAYS LABEL EACH AXIS, INCLUDING UNITS & SCALES

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