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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
Identify the W's of these data.- Identify the variables, classify each as categorical or quantitative, and specify units if relevant.
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Give a 90% confidence interval for the mean length of all great white sharks. (The interval may be too wide due to the influence of the outliers on s.)
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A random sample of 175 35-to 49-year-olds found that 119 owned a smartphone. If Population 1 is defined as 18-to 34-year-olds and Population 2 is defined as 35-to 49-year-olds, the pooled estimate for the overall proportion is ________. Round to t..
administrators at a university will charge students 158 to attend a seminar. it costs 2160 to reserve a room
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