Data collected by child development scientists produced this confidence interval for average age (in weeks) at which babies begin to crawl: t-interval for (95% Confidence): 29.202 < (age) < 31.844 a) Explain carefully what the software output means. b) What is the margin of error for this interval? c) If the researcher had calculated a 90% confidence interval, would the margin of error be larger or smaller? Explain