You are working part-time at a road construction firm. Your boss knows you are learning some statistics in your classes this semester and calls you into the office. She says, "We've taken sample densities from loads of asphalt we've gotten from our supplier. The information from their company says their process produces a consistent density with a population standard deviation (ơ) of 2.75 pounds per cubic foot. Here's the data we've collected. Can you give me an estimate of the average density (a confidence interval) that our supplier's process is producing? I want to be 85% confident of the range you provide."

Answer the following questions using the separate rates X1,..., X20 and Y1,..., Y20 shown in Figure 1. (a) Carry out the calculations for a test of the hypotheses that the mean U.S. mortality rate On remained the same or increased from 2005 to 2015 against the alternative that the mean mortality rate decreased. State the hypotheses, test statistic, rejection region, and p-value. Do not interpret the conclusion of the test. (b) Compute a 99% confidence interval for the change in mean heart rate mortality. Do not interpret the interval.

Please answer d and e.

Answer A through E

please answer 1 and 2

I need help with this parts a,b, and c please