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1.a company that has 360 employees was interested in determining the average salary of its employees, to figure this out the company divided the employees in to four groups;managers, drivers, office staff, and production staff, and then randomly selected employees from each group. What type of sampling method did they use?
a. stratified random sampling
b. systematic sampling
c. cluster sampling
d. simple random sampling

Select the statement that is not true about the hubble telescope: a. it orbits above the earth, avoiding the light distortion caused by our atmosphere. b. it is mounted high on a hawaiian mountaintop to provide stable images. c. it has allowed scientists to see the formation of far-away stars and solar systems, leadin some certainty about the history of our own solar system. d. it has documented the destruction of far-away stars and galaxies, leading to some certa the theories of the life cycles of stars.