NEW YORK, N.Y. - June 19, 2014 - The vast majority of Americans (89%) feel employers should try to offer workers flexibility to meet their families' needs, so long as the work gets done, signaling a strong sentiment in favor of the concept of flexible workplaces. What's more, over half (52%) of U.S. workers (not including those self-employed) - and nearly six in ten working parents (58%) - feel they could do their job better if they were allowed a more flexible work schedule. These are some of the results of The Harris Poll of 4,096 U.S. adults surveyed online between May 27 and 30, 2014.

a.) What is the sample size?

b.) If the margin of error for this sample is 1.56%, complete the sentence below:

We can be 95% certain that the true proportion of Americans who feel that employers should try to offer workers flexibility to mee their families' needs is betweenand