An educator wishes to study the effects of sleep deprivation on the ability to concentrate. He decides to study the students in a calculus class. Before the start of the class, each student is asked about the number of hours slept the previous night. Each student's eye movement is then tracked throughout the lecture. The amount of time is recorded whenever the student is not focused on either the instructor or taking notes. This is an example of: O a randomized experiment. O a sample survey. O a matched pairs study. O an observational study.

Ms. h's family is in the waiting room of the intensive care unit. ms. h is very ill and the family has been told she will probably die during this hospital admission. you are walking by the waiting room and you see that they are all seated together, crying. what is your best response? this task contains the radio buttons and checkboxes for options. the shortcut keys to perform this task are a to h and alt+1 to alt+9. a go into the waiting room, sit next to them, and give them time to talk with you. b call the hospital chaplain to visit them and offer prayers. c find a social worker to go into the waiting room to see if they need anything. d leave them alone to give them private time to do their grieving.

Why is it economically necessary for the east germans to build berlin wall

What are the cultural characteristics of mexico?