A consumer watchdog organization estimates the mean weight of 1-ounce "Fun-Size" candy bars to see if customers are getting full value for their money. A random sample of 25 bars is selected and weighted, and the organization reports that a 95% confidence interval for the true mean weight of the candy bars is 0.982 to 0.988 ounces.

a)What is the margin of error?

b) Interpret the confidence level of 95% in the context of the problem?