SOLUTION: The mean life of a battery used in a digital clock is 305 days. The lives of the batteries follow a normal distribution. The battery was recently modified to last longer. A sample
Algebra.Com
Question 1169693: The mean life of a battery used in a digital clock is 305 days. The lives of the batteries follow a normal distribution. The battery was recently modified to last longer. A sample of 30 of the modified batteries had a mean life of 311 days with a variance of 144 days. A hypothesis test isundertaken to determine whether the modification increased the battery life. The p - value of the test is equal to
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
this is a t-test
t(df=29)=(x bar-mean/)s/ sqrt(n); s is sqrt of variance or 12.
=6*sqrt(30)/12
2.738
One-way test
p-value is 0.005
RELATED QUESTIONS
1. From past records it is known that the average life of a battery used in a digital... (answered by CPhill)
From past records it is known that the average life of a battery used in a digital clock... (answered by stanbon)
From past records it is known that the average like of a battery used in a digital clock... (answered by stanbon)
A phone maker claims that its phones’ batteries last for 13.7 hours on average with... (answered by Boreal)
Mattel Corporation produces a remote-controlled car that requires three AA batteries. The (answered by ewatrrr)
The distribution of battery lives are assumed to be approximately normal and a... (answered by robertb)
An independent consumer testing lab preformed a statistical test on 25 type-C alkaline... (answered by stanbon)
An accerlerated life test on a large number type-D alkaline batteries revealed that the... (answered by stanbon)
) An independent consumer testing lab preformed a statistical test on 25 type-C alkaline... (answered by stanbon)