What Observations Suggest the Mass of the Galaxy Goes Much

question 60

Multiple Choice

What observations suggest the mass of the Galaxy goes much farther out than its visible disc?

• A) 21 cm maps of the spiral arms
• B) the rotation curve of the outermost portions of the disc
• C) the orbits of the open clusters in the disc
• D) infrared observations of distant brown dwarfs
• E) X-ray images of other galaxies' discs from Chandra

Understand the effect of sample size on the width of confidence intervals.

Know how to reduce the risk that the confidence interval does not contain the population mean.

Calculate degrees of freedom for various sample sizes.

Differentiate between confidence intervals for means and standard deviations.

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