How large of a sample must be taken in order to be 97%
If the standard deviation of the lifetimes of vacuum cleaners is estimated to be 300 hours, how large of a sample must be taken in order to be 97% confident that the margin of error will not exceed 40 hours?
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If you wish to estimate m correct to within 1.6, with probability equal to 0.95, how many observations should be included in your sample?
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