Question 462108
A random sample of 10 miniatures Tootsie Rolls was taken from a bag. Each piece was weighed on a very accurate scale. The results in grams were
3.087 3.131 3.241 3.241 3.270 3.353 3.400 3.411 3.437 3.477
(a) Construct a 90 percent confidence interval for the true mean weight. 
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A random sample of 10 miniature Tootsie Rolls was taken from a bag. Each piece was weighed on
a very accurate scale. 
The results in grams were 3.087 3.131 3.241 3.241 3.270 3.353 3.400 3.411 3.437 3.477 
(a) Construct a 90 percent confidence interval for the true mean weight.
sample mean = 3.3048 ; sample std = 0.13199
standard error: 1.645*0.13199/Sqrt(10) = 0.06866
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90% CI: 3.3048-0.06866 < u < 3.3048+0.06866
90% CI:3.23614 < u < 3.37346
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Cheers,
Stan H.
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