Use your calculator to find the least-squares regression line of guessed calories on true calories. Do this twice, first for all 10 data points and then leaving out spaghetti and snack cake.

A news site reported that 56% of registered voters in Ferndale support a proposition to build a new civic center. The survey involved calling a random sample of 1130 registered voters on their cell phones. On election day, the proposition failed to pass. Explain why the conclusion of the report may not have been valid.

A patient with a usually fatal form of cancer is given a new treatment. The response variable is the length of time that the patient lives after treatment. In this situation, describe a sample space S for the random phenomenon. In some cases, you have freedom in your choice of S.

To test the effects of a new fertilizer, 100 plots are treated with the new fertilizer, and 100 plots are treated with another fertilizer.

Government data assign a single cause for each death that occurs in the United States. The data show that the probability is 0.45 that a randomly chosen death was due to cardiovascular (mainly heart) disease, and 0.22 that it was due to cancer. What is the probability that a death was due either to cardiovascular disease or to cancer? What is the probability that the death was due to some other cause?

Select the best answer. Suppose that 35% of the registered voters in a state are registered as Republicans, 40% as Democrats, and 25% as Independents. A newspaper wants to select a sample of 1000 registered voters to predict the outcome of the next election. If they randomly select 350 Republicans, randomly select 400 Democrats, and randomly select 250 Independents, did this sampling procedure result in a simple random sample of registered voters from this district? (a) Yes, because each registered voter had the same chance of being chosen. (b) Yes, because random chance was involved. (c) No, because not all registered voters had the same chance of being chosen. (d) No, because there were different number of registered voters selected from each party. (e) No, because not all possible groups of 1000 registered voters had the same chance of being chosen.