In a study of 250 adults the average heart rate was 70 bpm assume the population of heart rates is known to be approximately normal with a standard deviation of 12 bpm what does a margin of error of 2 for the 98% confidence interval of the average beats per minutes mean?
There is a a 1% chance that the population mean is less than 70 bpm.
There’s a 1% chance that the population mean is more than 70 bpm.
There is a 99% chance that the population mean is between 58 and 82 bpm.
There is a 99% chance that the population mean is between 68 and 72 bpm.