blem select the best response a An engineer designs an improved light bulb The previous...
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blem select the best response a An engineer designs an improved light bulb The previous design had an average lifetime of 1200 hours The new bulb had a lifetime of 1200 2 hours using a sample of 40 000 bulbs Although the difference is quite small the effect was statistically significant The explanation is A that the sample size is very large B that new designs typically have more variability than standard designs C that the mean of 1200 is large D all of the above
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