If the manager of a bottled water distributor wants to estimate, with 95% confidence, the mean amount of water in a 1-gallon bottle to within ±0.003 gallons and also assumes that the standard deviation is 0.05 gallons, what sample size is needed?
If the manager of a bottled water distributor wants to estimate, with 95% confidence, the mean amount of water in a 1-gallon bottle to within
±0.003 gallons and also assumes that the standard deviation is 0.05 gallons, what sample size is needed?
1. If a light bulb manufacturing company wants to estimate, with 95% confidence, the mean life of compact fluorescent light bulbs to within
±150 hours and also assumes that the population standard deviation is 800 hours, how many compact fluorescent light bulbs need to be
selected?
n = (Round up to the nearest integer.)
2. If the inspection division of a county weights and measures department wants to estimate the mean amount of soft drink fill in 2-liter bottles
to within ±0.02 liter with 99% confidence and also assumes that the standard deviation is 0.08 liters, what sample size is needed?
n = (Round up to the nearest integer.)
3. An advertising executive wants to estimate the mean amount of time that consumers spend with digital media daily. From past studies, the
standard deviation is estimated as 45 minutes. What sample size is needed if the executive wants to be 90% confident of being correct to
within ±7 minutes?
n = (Round up to the nearest integer.)
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