STAT 121: Writing Assignment 1 Confidence Intervals

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STAT 121: Writing Assignment 1Confidence Intervals (12 points)Directions:Read the following article and answer each question completely but concisely. Besure to save a copy of your work, and see the syllabus for submission details. (The spacingbetween the questions is not necessarily an indication of the expected response length.)JournalMarch 26, 2010Resting Heart Rates of American AdultsA normal resting heart rate for adults ranges from 60 to 100 beats a minute," reports Dr. EdwardLaskowski of the Mayo Clinic. Lower resting heart rates are generally associated with highercardiovascular fitness. With the marked increase in obesity in America, there is rising concernthat the average resting heart rate of American adults is trending towards the higher end of theaccepted range. A recent study conducted by the Statistical Health Association of Americavalidates this concern. Results were based on a sample of 1587 American adults (ages 18 andolder). The mean resting heart rate from this sample was calculated at 87 beats per minute (bpm).The study concludes that, with 95% confidence, the true mean resting heart rate of Americanadults is in the interval (80, 94).1. (1 point) What is the population that the confidence interval in the article is making aninference about? Be specific.It is making an inference aboutresting heart rate ofall adults(ages 18 and older) inAmerica thus the population is the American adults2. (1 point)What is the parameter of interest for the confidence interval in context?The parameter of interest is the true average resting heart rate of all American adults.3. (2 points) Give the confidence interval as reported in the article. Is the reported interval in theform of an interval or is it in the form of estimate ± margin of error? If it is not in interval form,state it in interval form.The confidence interval stated in the terms of the article is (80, 94).I believe that thisconfidence interval is given in interval form.

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