Presenting Scientific Data

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Presentation transcript:

Presenting Scientific Data Ch. 1.4

Presenting Scientific Data In order for news to be useful, it must be reported in a clear, organized manner. Like the news, scientific data become meaningful only when they are organized and communicated. Communication includes visual presentations, such as this graph.

Organizing Data Scientists organize their data by using data tables and graphs. Data Tables The simplest way to organize data is to present them in a table. This table relates two variables— a manipulated variable (location) and a responding variable (average annual precip.).

Line Graphs A line graph is useful for showing changes that occur in related variables. In a line graph, the manipulated variable is generally plotted on the horizontal axis, or x-axis. The responding variable is plotted on the vertical axis, or y-axis, of the graph.

Sometimes the data points in a graph yield a straight line. The steepness, or slope, of this line is the ratio of a vertical change to the corresponding horizontal change. The formula for the slope of the line is:

Plotting the mass of water against the volume of water yields a straight line.

Organizing Data A direct proportion is a relationship in which the ratio of two variables is constant. The relationship between the mass and the volume of water is an example of a direct proportion. A 3-cubic-centimeter sample of water has a mass of 3 grams. A 6-cubic-centimeter sample of water has a mass of 6 grams. A 9-cubic-centimeter sample of water has a mass of 9 grams.

Organizing Data This graph shows how the flow rate of a water faucet affects the time required to fill a 1-gallon pot.

Organizing Data An inverse proportion is a relationship in which the product of two variables is a constant. A flow rate of 0.5 gallon per minute will fill the pot in 2 minutes. A flow rate of 1 gallon per minute will fill the pot in 1 minute. A flow rate of 2 gallons per minute will fill the pot in 0.5 minute.

Bar Graph A bar graph is often used to compare a set of measurements, amounts, or changes.

Circle Graph If you think of a pie cut into pieces, you have a mental model of a circle graph. A circle graph shows how a part or share of something relates to the whole.

Communicating Data Scientists can communicate results by writing in scientific journals or speaking at conferences. Peer review is a process in which scientists examine other scientists’ work. Peer review encourages comments, suggestions, questions, and criticism from other scientists. Based on their peers’ responses, the scientists who submitted their work for review can then reevaluate how to best interpret their data.