SOLUTION: The following data represents the age (in weeks) at which babies first crawl based on survey of 12 mothers: 52, 30, 44, 35, 26, 47, 37, 56, 39, 26, 39, 28 Assume t

Algebra ->  Algebra  -> Probability-and-statistics -> SOLUTION: The following data represents the age (in weeks) at which babies first crawl based on survey of 12 mothers: 52, 30, 44, 35, 26, 47, 37, 56, 39, 26, 39, 28 Assume t      Log On

Ad: Algebrator™ solves your algebra problems and provides step-by-step explanations!
Ad: Algebra Solved!™: algebra software solves algebra homework problems with step-by-step help!

   

Question 170987: The following data represents the age (in weeks) at which babies first crawl based on survey of 12 mothers:
52, 30, 44, 35, 26, 47, 37, 56, 39, 26, 39, 28
Assume that the data comes from a normal distribution. Conduct a 95% confidence interval for the mean age at which a baby first crawls.

Answer by stanbon(48568) About Me  (Show Source):
You can put this solution on YOUR website!
The following data represents the age (in weeks) at which babies first crawl based on survey of 12 mothers:
52, 30, 44, 35, 26, 47, 37, 56, 39, 26, 39, 28
Assume that the data comes from a normal distribution. Conduct a 95% confidence interval for the mean age at which a baby first crawls.
---------------
x-bar = 38.25
s = 10.00
=============
E = 1.96*10/sqrt(12) = 5.65
----------
95% CI:
38.25-5.65 < u < 38.25+5.65
simplify
==================
Cheers,
Stan H.