6 of 9 (0 complete) This Test: 9 pls possible A light bulb manufacturer guarante

Question

6 of 9 (0 complete) This Test: 9 pls possible A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is at least 749 hours A random sample of 22 light bulbs has a life of 738 hours Assume the population s normally distributed and the population standard de ation is 62 hours. At :0 02, do you have enough evidence to reject the manufacturer's claim? Complete parts (a) through (e). (a) Identify the nul hypothesis and alternative hypothesis. O A. Ho H3 749 (claim) OB, Ho- 749(claim) ° C. Ha : = 749 Ho: >749 Ha : s 749 (claim) Ho :

Explanation / Answer

a) Answer: Option A. The claim is atleast 749 and therefore this is the null hypothesis

b) Zcrit = 2.05 at 0.02 significance level

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