A researcher studying the lifespan of a certain species of bacteria. A preliminary sample of 25 bacteria reveals a sample mean of = 70 hours with a standard deviation of s = 7 hours. He would like to estimate the mean lifespan for this species of bacteria to within a margin of error of 0.5 hours at a 99% level of confidence. What sample size should you gather to achieve a 0.5 hour margin of error? He would need to sample bacteria.

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A researcher studying the lifespan of a certain species of bacteria. A preliminary sample of 25 bacteria
reveals a sample mean of = 70 hours with a standard deviation of s = 7 hours. He would like to
estimate the mean lifespan for this species of bacteria to within a margin of error of 0.5 hours at a 99%
level of confidence.
What sample size should you gather to achieve a 0.5 hour margin of error?
He would need to sample
bacteria.
Transcribed Image Text:A researcher studying the lifespan of a certain species of bacteria. A preliminary sample of 25 bacteria reveals a sample mean of = 70 hours with a standard deviation of s = 7 hours. He would like to estimate the mean lifespan for this species of bacteria to within a margin of error of 0.5 hours at a 99% level of confidence. What sample size should you gather to achieve a 0.5 hour margin of error? He would need to sample bacteria.
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