the standard deviation of the amount poured into bottles by an automatic filling machine is 1.8 ml. The amount of fill in ml were 481,479,482,480,477,478,481 and 482. Construct 95% confidence interval for the mean amount of all bottles filled by the machine
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Step-by-step explanation:
ci= mean+/- (sd×z/sqrt n)
z for 95% confidence interval is 1.96
sd=1.8ml
mean=sum of observations /no. of observations
=480
ci = 480+/- 1.8*1.96/SQRT8
=480+/- 1.25
=481.25 from 478.75
hope this helps
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