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Answer : Sample size = 44
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5. Mike wishes to estimate the mean number birds that visit his bird feeder each day....
9. Suppose that a milk producer wishes to estimate the mean shelf life (in days) of...
9. Suppose that a milk producer wishes to estimate the mean shelf life (in days) of one-gallon cartons of milk. The population standard deviation is known from past studies. If the manufacturer wishes to be 95% confident of getting an estimate within 2 days of the true mean shelf life, what was the standard deviation (0) if the required sample size is 138.3 before rounding up?
One researcher wishes to estimate the mean number of hours that high school students spend watching...
One researcher wishes to estimate the mean number of hours that high school students spend watching TV on a weekday. A margin of error of 0.27 hour is desired. Past studies suggest that a population standard deviation of 1.5 hours is reasonable. Estimate the minimum sample size required to estimate the population mean with the stated accuracy. The required sample size is (Round up to the nearest whole number.)
One researcher wishes to estimate the mean number of hours that high school students spend watching...
One researcher wishes to estimate the mean number of hours that high school students spend watching TV on a weekday. A margin of error of 0.29 0.29 hour is desired. Past studies suggest that a population standard deviation of 2.4 2.4 hours is reasonable. Estimate the minimum sample size required to estimate the population mean with the stated accuracy. The required sample size is nothing . (Round up to the nearest whole numbe These are the only numbers I was...
In order to estimate the mean amount of time computer users spend on the internet each...
In order to estimate the mean amount of time computer users spend on the internet each month, how many computer users must be surveyed in order to be 90% confident that your sample mean is within 11 minutes of the population mean? Assume that the standard deviation of the population of monthly time spent on the internet is 208 min. What is a major obstacle to getting a good estimate of the population mean? Use technology to find the estimated...
A health care professional wishes to estimate the birth weights of infants. How large a sample...
A health care professional wishes to estimate the birth weights of infants. How large a sample must be obtained if he desires to be 97% confident that the true mean is within 3 ounces of the sample mean and assume we know the population variance from past studies is 81 ounces?
In order to estimate the mean amount of time computer users spend on the internet each...
In order to estimate the mean amount of time computer users spend on the internet each month, how many computer users must be surveyed in order to be 90% confident that your sample mean is within 15 minutes of the population mean? Assume that the standard deviation of the population of monthly time spent on the internet is 224 min. What is a major obstacle to getting a good estimate of the population mean? Use technology to find the estimated...
2) Suppose we want to estimate the mean mortage layment for homes in Denver. Suppose that...
2) Suppose we want to estimate the mean mortage layment for homes in Denver. Suppose that it is known from past data thag the mean monthly mortage payment is $2500 with a standard deviation of $1000. If we want to be 92% confident that lur sample mean is within $300 of the population mean, what is the recommended sample size? 3) Suppose we want to estimate the proportion of homes in Denver that are valued at over $1,000,000. Suppose that...
You want to obtain a sample to estimate a population mean. Based on previous evidence, you...
You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately σ=61.9σ=61.9. You would like to be 90% confident that your estimate is within 1.5 of the true population mean. How large of a sample size is required?
You want to obtain a sample to estimate a population mean. Based on previous evidence, you...
You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately σ = 37.2 σ = 37.2 . You would like to be 90% confident that your estimate is within 1.5 of the true population mean. How large of a sample size is required? n=?
6. In order to estimate the mean amount of time computer users spend on the internet...
6. In order to estimate the mean amount of time computer users spend on the internet each month, how many computer users must be surveyed in order to be 90% confident that your sample mean is within 11 minutes of the population mean? Assume that the standard deviation of the population of monthly time spent on the internet is 228 min. What is a major obstacle to getting a good estimate of the population mean? Use technology to find the...
9. Suppose that a milk producer wishes to estimate the mean shelf life (in days) of one-gallon cartons of milk. The population standard deviation is known from past studies. If the manufacturer wishes to be 95% confident of getting an estimate within 2 days of the true mean shelf life, what was the standard deviation (0) if the required sample size is 138.3 before rounding up?
One researcher wishes to estimate the mean number of hours that high school students spend watching TV on a weekday. A margin of error of 0.27 hour is desired. Past studies suggest that a population standard deviation of 1.5 hours is reasonable. Estimate the minimum sample size required to estimate the population mean with the stated accuracy. The required sample size is (Round up to the nearest whole number.)
In order to estimate the mean amount of time computer users spend on the internet each month, how many computer users must be surveyed in order to be 90% confident that your sample mean is within 15 minutes of the population mean? Assume that the standard deviation of the population of monthly time spent on the internet is 224 min. What is a major obstacle to getting a good estimate of the population mean? Use technology to find the estimated...
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