(05.04 MC)  A city is interested in building a swan sanctua…

(05.04 MC)  A city is interested in building a swan sanctuary in a certain area. One hundred fifty randomly selected residents from this area were asked, “Do you support the city’s decision to build a swan sanctuary in your area?” Of the 150 residents interviewed, 76 said no, 9 said yes, and 65 had no opinion. A large-sample z-confidence interval, p̂ ± z * , was constructed from these data to estimate the proportion of the residents who support building a swan sanctuary in a certain area. Which of the following statements is correct for this confidence interval? (5 points)

(05.02 MC)  A metal washer fabrication machine makes metal…

(05.02 MC)  A metal washer fabrication machine makes metal washers with a target diameter of μ = 10.5 millimeters. The machine has some variability, so the standard deviation of the diameters is σ = 0.003 millimeter. The machine operator inspects a random sample of nine washers each hour for quality control purposes and records the sample mean diameter, x̄. Assuming the process is working properly, what are the mean and standard deviation of the sampling distribution of x̄? (4 points)