Aroofing company would like to implement a new method for giving estimates. the owner has narrowed his choice to three different methods. since estimator variability is believed to be a significant factor in the overall cost estimate, each of the company's three job estimators is asked to give a cost estimate for a new roof using each of the three methods. the data will be analyzed using a randomized block design. what are the blocks in this study? a. the roofing company b. the estimators c. the estimate method d. the cost for a new roof

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50. write an inequality to determine the number of chores, c, janie could do to have enough money to buy the cd.

Apsychology student wishes to investigate differences in political opinions between business majors and political science majors at her college. she randomly selects 100 students from the 260 business majors and 100 students from the 180 political science majors. does this sampling plan result in a simple random sample? why or why not? no, because each group of 200 students in the sample does not have the same chance of being selected. yes, because each group of 200 students in the sample has the same chance of being selected. no, because each individual student does not have an equal chance of being selected. yes, because each individual student has the same chance of being selected.

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?