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Lifespan of a certain species of bacteria

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You are a researcher studying the lifespan of a certain species of bacteria. A preliminary sample of 35 bacteria reveals a sample mean of ¯x = 80 hours with a standard deviation of s = 4.2 hours. You would like to estimate the mean lifespan for this species of bacteria to within a margin of error of 0.55 hours at a 90% level of confidence.

What sample size should you gather to achieve a 0.55 hour margin of error?

Round your answer up to the nearest whole number.

n = ________  bacteria

Reference no: EM132188147

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