Researchers studying the lifespan of a certain species of insect collected data from a random sample of 200 insects. They estimated the mean lifespan to be 75 days, with an associated margin of error of 3.5 days. Based on this information, which of the following statements is most accurate?
The true mean lifespan of this species of insect is exactly 75 days.
The true mean lifespan of this species of insect is definitely between 71.5 days and 78.5 days.
It is plausible that the true mean lifespan of this species of insect is between 71.5 days and 78.5 days.
The true mean lifespan of this species of insect is less than 71.5 days or greater than 78.5 days.
