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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.
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