A researcher, involved in a study of the population of Houston, divided the city into city blocks and then drew a random sample of 200 city blocks. All households in the 200 blocks were interviewed. The researcher used : a) Stratified sampling
b) Simple random sampling
c) Quota sampling
d) Cluster sampling

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?

According to the data set, where should the upper quartile line of the box plot be placed?

Martha has a deck of cards. she has lost some of the cards, and now the deck only contains nine spades, eleven diamonds, eight clubs, and twelve hearts. martha predicts that whenever she draws a card from the deck without looking, she will draw a club one-fifth of the time. which activity would best allow martha to test her prediction? a. randomly draw a card from the box and see if it is a club. b. randomly draw a card. then, continue to draw another card until all eight clubs are drawn. c. randomly draw and replace a card 120 times. then, observe how close to 30 times a club is drawn. d. randomly draw and replace a card 100 times. then, observe how close to 20 times a club is drawn.