GGR270H1 Final: Week 3 Study Notes

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tealwhale232

13 Dec 2010

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Ggr 270 lecture 3 september 29, 2010. graphs are limited in what they can tell us. difficulty making inferences about a population when looking at a subset or sample. measures associated with the population are called parameters. measures associated with a sample are called statistics. most commonly used measure of central tendency. sum of all values or observations divided by the number of observations. value occupying the middle position" in an ordered set of observations. order the observations, lowest to highest, and find the middle position www. notesolution. com. value that occurs with the highest frequency. allows you to locate the peak of relative frequency histogram. Mean is usually the best measure as it is sensitive to change in a single observation. outliers (extreme values) are present in the data set. Positive skew mode, med, mean mean>median. Negative skew mean, median, mode mean

Related Questions

Appearing in the time-dilation and length-contractionformulas, ?(lorentz factor) is a reasonable measure of the size ofrelativistic effects. Roughly speaking, at what speed wouldobservations deviate from classical expectations by 1%?

Light of three different wavelengths 325nm, 455nm, and 632nm is shined on a metal surface. The observations for each wavelength labelled A, B, and C is as follows.

Observation A: No photoelectron were observed.

Observation B: Photoelectrons with a kinetic energy of 155kJ/mol were observed.

Observation C: Photoelectrons with a kinetic energy of 51kJ/mol were observed.

Which observation corresponds to which wavelength of light?

limegoldfish893

Introduction. Telescope time is a valuablecommodity in astronomy, so astronomers plan their observationscarefully. One of the first steps is to choose what type ofobservation to make. Recall that three basic types of astronomicalobservation are imaging (taking a photograph of anobject), spectroscopy (spreading an object's light into aspectrum), and timing (measuring how an object's lightvaries with time).

Part A: Sort each of the astronomical questionsbelow into the appropriate bin based on the type of observation youwould need to perform to answer it.

Three Categories: Imagine, Spectroscopy andTiming

The Questions:

1. "What are the major surface features of Mars?"

2. "What is the temperature of Jupiter's atmosphere?"

3. "Does the star Mira vary in brightness?"

4. "How large is the Andromeda Galaxy?"

5. "What is the chemical composition of the Crab Nebula?"

6. "Is the X-ray emission fro the galactic center steady orchanging?"

7. "Is the star Vega moving toward us or away from us?"

8. "Are stars in the Orion Nebula surrounded by dusty disks ofgas?"

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Introduction: Different telescopes areoptimized for observing different wavelengths of light, so anotherconsideration in planning an observation is deciding what type oftelescope to use.

Part B: Each of the following statementsdescribes an astronomical measurement. Place each measurement intothe appropriate bin based on the type of telescope you would use tomake it.

Three Categories: Infrared Telescope, VisibleLight Telescope and X-Ray Telescope

The Statements:

1. Study a dense cloud of cold gas in space.

2. Measure the brightness of a star that is similar to ourSun.

3. Observe the hot (1-million K) gas in the Sun's corona.

4. Obtain a spectrum of sunlight reflected by Mars.

5. Determine the surface temperature of Venus.

6. Look for high-energy radiation from a supernova.

Thank you so much to whoever helps!

GGR270H1 Final: Week 3 Study Notes

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