Question: Data collected by child development scientists produced this confidence interval for the average (in weeks) at which babies began to crawl.

t-Interval for u
[95.00% Confidence]: 29.202 < u[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.
d) Can we conclude that the average age at which babies began to crawl is greater than 31 weeks? Explain why or why not.