What are the differences among an experiment, a study, and a survey? 1. in an observational study, randomization of subjects a. occurs b. does not occur 2. a survey a. poses no interference on subjects b. makes inferences about a population 3. in an experiment, to discern differences in a response variable. a. treatment is imposed b. inferences are made c. randomization does not occur

If a 36 inch yardstick casts a 21 foot shadow, how tall is a building whose shadow is 168 feet? what is the scale factor

There are 45 questions on your math exam. you answered 810 of them correctly. how many questions did you answer correctly?

I've been working on this for a few days and i just don't understand, it's due in a few hours. you. the direction of a vector is defined as the angle of the vector in relation to a horizontal line. as a standard, this angle is measured counterclockwise from the positive x-axis. the direction or angle of v in the diagram is α.part a: how can you use trigonometric ratios to calculate the direction α of a general vector v = < x, y> similar to the diagram? part bsuppose that vector v lies in quadrant ii, quadrant iii, or quadrant iv. how can you use trigonometric ratios to calculate the direction (i. e., angle) of the vector in each of these quadrants with respect to the positive x-axis? the angle between the vector and the positive x-axis will be greater than 90 degrees in each case. part cnow try a numerical problem. what is the direction of the vector w = < -1, 6 > ?