SOLUTION: write the word or phrase that best completes each statement or answers the question
A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1000 hours. A homeow
Algebra ->
Probability-and-statistics
-> SOLUTION: write the word or phrase that best completes each statement or answers the question
A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1000 hours. A homeow
Log On
Question 1182574: write the word or phrase that best completes each statement or answers the question
A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1000 hours. A homeowner selects 40 bulbs and finds the mean lifetime to be 990 hours with a population standard deviation of 80 hours. Test the manufacturer's claim. Use α = 0.05. Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! Ho: mu=1000 hours
Ha: mu NE 1000 hours
alpha=0.05 P{reject Ho|Ho true}
test is a z.
critical value is |z| >1.96
calculation z=(990-1000)/80/sqrt(40)
=-10*sqrt(40)/80
=-0.79
fail to rect Ho, The mean lifetime can be 1000 hours; insufficient evidence to state otherwise.
p-value=0.43
