Identify the types of sampling errors that exist in the following sampling designs: The local newspaper plans to make a prediction for a senatorial election based on a survey of its readers.
A radio show asks people to phone in their views on whether the United States should pay off its debt to China.
A new social media website chooses to survey the first 50 members who join to determine whether members favor the appearance of the homepage.
I, voluntary; II, nonresponse; III, convenience
I, nonresponse; II, voluntary; III, convenience
I, nonresponse; II, convenience; III, voluntary
I, voluntary; II, convenience; III, nonresponse
I, convenience; II, voluntary; III, nonresponse

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 > ?