Which of the following is not a characteristic of both surveys and
observational studies?
O
A. The researcher does not control or change the population.
O
B. Results are not used to prove cause and effect.
O
C. Data are collected about a population.
O
D. The researcher exercises direct control over at least one variable.

Each of the walls of a room with square dimensions has been built with two pieces of sheetrock, a smaller one and a larger one. the length of all the smaller ones is the same and is stored in the variable small. similarly, the length of all the larger ones is the same and is stored in the variable large. write a single expression whose value is the total area of this room. do not use any method invocations.

If a line is defined by the equation y = 5x + 2, what is the slope?

Compute the standard deviation of the following set of data to the nearest whole number. 10, 10, 15, 20, 25