The resting heart rates for 80 women aged 46 minus 55 in a simple random sample are normally distributed, with a mean of 71 beats per minute and a standard deviation of 6 beats per minute. Assuming a 90 percent confidence level open paren 90 percent confidence level is equal to z - score of 1 point 6 4 5 close paren , what is the margin of error for the population mean? Remember, the margin of error, ME , can be determined using the formula ME is equal to the fraction with numerator z times s and denominator square root of n