Question on z-test, A new company is manufacturing light

Question on z-test

Reference no: EM13106542

A new company is manufacturing light bulbs. The CEO claims that the average light bulb lasts 260 days. A researcher selects 25 bulbs for testing. The sample bulbs last an average of 250 days with a standard deviation of 20 days. If the CEO's claim was true, can we conclude that 25 random bulbs will last 260 days at a 0.01 level of significance?

Can you explain the steps in getting the answer?

Reference no: EM13106542

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