A researcher studying the lifespan of a certain species of bacteria. A preliminary sample of 25 bacteria reveals a sample mean of ¯x=80x¯=80 hours with a standard deviation of s=4.4s=4.4 hours. He would like to estimate the mean lifespan for this species of bacteria to within a margin of error of 0.7 hours at a 99% level of confidence. What sample size should you gather to achieve a 0.7 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 ¯x=80x¯=80 hours with a standard deviation of s=4.4s=4.4 hours. He would like to estimate the mean lifespan for this species of bacteria to within a margin of error of 0.7 hours at a 99% level of confidence.

What sample size should you gather to achieve a 0.7 hour margin of error?

He would need to sample __________ bacteria.

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It is given that the confidence level is 0.99, the standard deviation is 4.4, and the margin of error E is 0.7.

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