Question

Data collected by child development scientists produced this confidence interval for average age (in weeks) at which babies begin to crawl:

t-interval for μ

(95% Confidence): 29.202 < μ(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

Answer 1

a). From given confidence interval, we can conclude that 95% population average age for the population from which data is collected by child development scientist is fall between 29.202 and 31.844

b). Margin of error= 1.321

c). Margin of error is for 90% confidence interval is smaller than the margin of error for 95% confidence interval.

Complete solution is given in attached images:

Thank You.