Mika is a local farmer who is interested in how often residents in her town go to a farmer's market each month. She surveys 124 families and finds that, on average, those families visit a farmers' market 4.2
times per month with a sample standard deviation of 1.3
. If Mika wants to be 99%
confident (z=2.58
) using this sample, what should her margin of error be and what does it mean?