To evaluate the quality of their product, a manufacturer of cell phones checks every 50th phones off the assembly line. I think this sample is valid or not valid because:

Lloyd’s of london was one of the first institutions to offer insurance to merchants and joint-trade companies. a major part of the insurance system involved people who agreed to take responsibility for the insured losses in return for a fee. what were these risk-takers known as? a. joint-stock companies b. investors c. underwriters d. merchants e. capitalists

Why did president johnson decide not to run for reelection in 1968?

Which of the following problems did shays rebellion show about the articles of confederation? a. there was no federal standing army b. states couldn’t create their own tax laws c. the federal government imposed too many taxes on states d. there was too much federal regulation of interstate commerce