In: Statistics and Probability
Question 1. The heart rate of 20 randomly selected adults was on average 85 beats per minute (bpm) with a standard deviation of 5 bpm. Build a 95% confidence interval for the mean heart rate of adults in the population. Interpret the interval you have created
We have given that,
Sample mean =85 beats per minute
Sample standard deviation = 5 beats per minute
Sample size =20
Level of significance=1-0.95=0.05
Degree of freedom =19
t critical value is (by using t table)=2.093
Confidence interval formula is
=(82.66,87.34)
Lower confidence limit= 82.66 beats per
minute
Upper confidence limit= 87.34 beats per
minute
We are 95% confident that population mean heart rate of adults is between 82.66 bpm to 87.34 bpm |