Seafloor mapping:  The two modern methods of mapping the sea…

Seafloor mapping:  The two modern methods of mapping the seafloor (water depth) are echo sounding (sonar) satellite altimetry 1. Explain how echo sounding works (2-4 sentences).  Be sure to include what is measured how these measurements are converted to water depth. 2. Briefly state one advantage of using satellite altimetry over echo sounding.

Let’s say a new test is developed to measure symptoms of dep…

Let’s say a new test is developed to measure symptoms of depression. It is compared against an existing, and proven test, such as the Beck Depression Inventory (BDI).  If the new test measures depression, then the scores on it should be highly comparable to the ones obtained by the BDI. Assuming this is so, we would say the test _____.