Which statements accurately describe the Doppler effect? Select three options.

a. It is used to learn about the behavior of the universe.
b. It was used by Hubble to measure velocities of galaxies.
c. It indicates galaxy motion through light wavelengths.
d. It indicates a galaxy moving toward Earth through red shift. It indicates a galaxy moving away from Earth through blue shift.

Density of salty water as compared to the density of pure water is(a) is less(b) is always equal(c) is always more(d) may be less or more

Which is an example of an exothermic process?

7. see worksheet 1 for values of variables x1, x2 and x3 and answer the following questions: a. for each variable find the mean, median, coefficient of skewness, range and population standard deviation. b. compared to variable x1, how are the mean and median affected by extreme values (outliers) seen in x2 and x3. c. is the median or mean the better measure of location for x2 and x3? explain. d. explain the differences in the magnitudes of the skewness coefficients for the three variables. e. what is the relationship between the range and standard deviation looking across the three variables?