STAT 121: Wri+ng Assignment 1 Condence Intervals (12 points) Direc+ons: Read the following ar0cle and answer each ques0on completely but concisely. Be sure to save a copy of your work, and see the syllabus for submission details. (The spacing between the ques0ons is not necessarily an indica0on of the expected response length.) Journal March 26, 2010 Resting Heart Rates of American Adults A normal resting heart rate for adults ranges from 60 to 100 beats a minute," reports Dr. Edward Laskowski of the Mayo Clinic. Lower resting heart rates are generally associated with higher cardiovascular fitness. With the marked increase in obesity in America, there is rising concern that the average resting heart rate of American adults is trending towards the higher end of the accepted range. A recent study conducted by the Statistical Health Association of America validates this concern. Results were based on a sample of 1587 American adults (ages 18 and older). The mean resting heart rate from this sample was calculated at 87.19 beats per minute (bpm), and a 0.34 margin of error was calculated with 95% confidence. Below is a histogram of the resting heart rates of those American adults sampled. 1. (1 point) What is the popula0on that the condence interval in the ar0cle is making an inference about? Be specic. 2. (1 point) What is the parameter of interest for the condence interval in context? 3. (2 points) Give the condence interval as reported in the ar0cle. Is the reported interval in the form of an interval or is it in the form of es0mate margin of error? If it is not in interval form, state it in interval form. 4. (3 points) What condence level is associated with the given interval? Interpret this level of condence. 5. (2 points) How was the sample collected? Does this allow us to infer things about the popula0on? If the ar0cle does not state how it was collected, how SHOULD it have been collected? 6. (3 points) Interpret your calculated interval in context. Make sure to include all three parts of a condence interval interpreta0on. STAT 121: Wri+ng Assignment 1 Condence Intervals (12 points) Direc+ons: Read the following ar0cle and answer each ques0on completely but concisely. Be sure to save a copy of your work, and see the syllabus for submission details. (The spacing between the ques0ons is not necessarily an indica0on of the expected response length.) Journal March 26, 2010 Resting Heart Rates of American Adults A normal resting heart rate for adults ranges from 60 to 100 beats a minute," reports Dr. Edward Laskowski of the Mayo Clinic. Lower resting heart rates are generally associated with higher cardiovascular fitness. With the marked increase in obesity in America, there is rising concern that the average resting heart rate of American adults is trending towards the higher end of the accepted range. A recent study conducted by the Statistical Health Association of America validates this concern. Results were based on a sample of 1587 American adults (ages 18 and older). The mean resting heart rate from this sample was calculated at 87.19 beats per minute (bpm), and a 0.34 margin of error was calculated with 95% confidence. Below is a histogram of the resting heart rates of those American adults sampled. 1. (1 point) What is the popula0on that the condence interval in the ar0cle is making an inference about? Be specic. 2. (1 point) What is the parameter of interest for the condence interval in context? 3. (2 points) Give the condence interval as reported in the ar0cle. Is the reported interval in the form of an interval or is it in the form of es0mate margin of error? If it is not in interval form, state it in interval form. 4. (3 points) What condence level is associated with the given interval? Interpret this level of condence. 5. (2 points) How was the sample collected? Does this allow us to infer things about the popula0on? If the ar0cle does not state how it was collected, how SHOULD it have been collected? 6. (3 points) Interpret your calculated interval in context. Make sure to include all three parts of a condence interval interpreta0on. \fSTAT 121: Wri+ng Assignment 1 Condence Intervals (12 points) Direc+ons: Read the following ar0cle and answer each ques0on completely but concisely. Be sure to save a copy of your work, and see the syllabus for submission details. (The spacing between the ques0ons is not necessarily an indica0on of the expected response length.) Journal March 26, 2010 Resting Heart Rates of American Adults A normal resting heart rate for adults ranges from 60 to 100 beats a minute," reports Dr. Edward Laskowski of the Mayo Clinic. Lower resting heart rates are generally associated with higher cardiovascular fitness. With the marked increase in obesity in America, there is rising concern that the average resting heart rate of American adults is trending towards the higher end of the accepted range. A recent study conducted by the Statistical Health Association of America validates this concern. Results were based on a sample of 1587 American adults (ages 18 and older). The mean resting heart rate from this sample was calculated at 87.19 beats per minute (bpm), and a 0.34 margin of error was calculated with 95% confidence. Below is a histogram of the resting heart rates of those American adults sampled. 1. (1 point) What is the popula0on that the condence interval in the ar0cle is making an inference about? Be specic. 2. (1 point) What is the parameter of interest for the condence interval in context? 3. (2 points) Give the condence interval as reported in the ar0cle. Is the reported interval in the form of an interval or is it in the form of es0mate margin of error? If it is not in interval form, state it in interval form. 4. (3 points) What condence level is associated with the given interval? Interpret this level of condence. 5. (2 points) How was the sample collected? Does this allow us to infer things about the popula0on? If the ar0cle does not state how it was collected, how SHOULD it have been collected? 6. (3 points) Interpret your calculated interval in context. Make sure to include all three parts of a condence interval interpreta0on. \f