Respuesta :
The 95% confidence interval for the mean is (1.535, 1.504).
It is given that a machine produces 1.50 pounds of cereal. The sample is 56 cereal boxes. The sample mean filling weight is calculated as 1.52 pounds. The population standard deviation is known to be 0.06 pounds.
Mean = 1.50 pounds
x = 1.52 pounds
Standard deviation = SD = 0.06 pounds
n = 56
We need to find the 95% confidence interval for the mean.
So, z = 1.96
So, the confidence interval would be
[tex]x[/tex]±[tex]z\frac{mean}{\sqrt{n} }[/tex]
[tex]1.52[/tex]±[tex]1.96*\frac{0.06}{\sqrt{56} }[/tex]
= [tex]1.52[/tex]±[tex]1.96*0.00801[/tex]
= [tex](1.52 + 0.0156996),(1.52 - 0.0156996)[/tex]
= [tex](1.535, 1.504)[/tex]
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