Determining x-bar and s for data set

Reference no: EM1319276

Q1) Light-bulb producer advertises that average life for its light bulbs is 900 hours. Random sample of 15 of its light bulbs resulted in following lives in hours.

995	590	510	539	739	917	571	555
916	728	664	693	708	887	849

a) Determine x-bar and s for this data set.

b) At 10% significance level, do data give evidence that mean life for the company's light bulbs varies from advertised mean? You may suppose the values for bulb life are normally distributed. Use traditional method to make your decision.

Reference no: EM1319276

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