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

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
RELATED QUESTIONS
Write the word or phrase that best completes each statement or answers the question. The (answered by rajagopalan)

SHORT ANSWER. Write the word or phrase that best completes each statement or answers the... (answered by stanbon)

Determine the center, vertices, and foci for the following ellipse... (answered by MathLover1,KMST)

Write the word or phrase that best completes each statement or answers the following... (answered by richwmiller)

Short answer. Write the word or phrase that best completes each statement or answers the... (answered by stanbon,Annie C)

Write the word or phrase that best completes each statement or answers the following... (answered by richwmiller)

Write the word or phrase that best completes each statement or answers the following... (answered by solver91311)

I NEED URGENT HELP WITH THESE TWO QUESTIONS. MY STEPS WERE CORRECT BUT CALCULATIONS ARE... (answered by stanbon)

Choose the one alternative that best completes the statement or answers the question.... (answered by stanbon)