1- A researcher makes a research about the life time of batteries which have a normal distribution with mean of 50 hours and variance of 9 hours. In order to understand the life time of batteries s/he randomly selected 9 batteries and calculate the sample mean as 48 hours and standard deviation of 5 hours. Construct 80 % confidence interval for the true population mean of life time of batteries. (46.72 , 49.28) (46.36 , 49.65) a) 383 b) (46.04, 49.96) d) (45.43, 50.57) There is no correct answer Boş bırak

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1- A researcher makes a research about the life time of batteries which have a normal distribution with mean of 50
hours and variance of 9 hours. In order to understand the life time of batteries s/he randomly selected 9 batteries
and calculate the sample mean as 48 hours and standard deviation of 5 hours. Construct 80 % confidence interval for
the true population mean of life time of batteries.
a)
(46.72, 49.28)
(46.36 , 49.65)
c)
b)
3831
(46.04, 49.96)
d)
(45.43, 50.57)
e)
There is no correct answer
Boş bırak
Transcribed Image Text:1- A researcher makes a research about the life time of batteries which have a normal distribution with mean of 50 hours and variance of 9 hours. In order to understand the life time of batteries s/he randomly selected 9 batteries and calculate the sample mean as 48 hours and standard deviation of 5 hours. Construct 80 % confidence interval for the true population mean of life time of batteries. a) (46.72, 49.28) (46.36 , 49.65) c) b) 3831 (46.04, 49.96) d) (45.43, 50.57) e) There is no correct answer Boş bırak
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