Question 11 10 pts State University uses thousands of fluorescent light bulbs ea

Question

Question 11 10 pts State University uses thousands of fluorescent light bulbs each year. The brand of bulb it currently uses has a mean life of 890 hours. A competitor claims that its bulbs, which cost the same as the brand the university currently uses, have a mean life of more than 890 hours. The university has decided to purchase the new brand if, when tested, the evidence supports the manufacturer's claim at the 0.05 significance level. Suppose 23 bulbs were tested with the following results: - 915 hours, and S-84 hours Do these data provide sufficient evidence that the true mean is more than 890 hours? At 5% significance level find the correct rejection region IM Atte 32 O t> 1.72 O t>1.645 O t2.07 4 Previous Next

Explanation / Answer

We have the testing problem of

H0 : MEAN =890

VS

H1 :MEAN >890

for that testing we have one sided critcrit region as

For n=23 and alpha=0.05 is

T>t(n-1,0.05)=1.72

Option A

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