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strobro strobro
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6 years ago
The mean replacement time for a random sample of 20 washing machines is 9.3 years and the standard deviation is 2.5 years.
 
  Construct a 99 confidence interval for the standard deviation, , of the replacement times of all washing machines of this type.
  A) 1.7 yr <  < 4.8 yr B) 1.8 yr <  < 5.3 yr C) 1.8 yr <  < 3.9 yr D) 1.8 yr <  < 4.2 yr
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kwengertkwengert
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6 years ago
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strobro Author
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6 years ago
Brilliant ツ
dearsophia21
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Yesterday
Smart ... Thanks!
mmmm_dat_userna
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2 hours ago
Thanks
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