Suppose that a researcher is interested in estimating the population mean (Miu_X) of a population with...
Suppose that a researcher is interested in estimating the population mean (Miu_X) of a population with the sample average estimator, X_bar. The population has a population standard deviation of Sigma_X. The question that the research has is: “How large should my sample size be?” You help her out and tell her the following: “Your sample size (n) should be such that there is a 95% chance that the X_bar will be within +/-10% away from the Miu_X.” Based on this information, please derive a mathematical expression for the sample size (n) as a function of Miu_X and Sigma_X.
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Suppose that a researcher is interested in estimating the
population mean (Miu_X) of a population with...
A researcher is interested in estimating the mean level of a water pollutant for a county...
A researcher is interested in estimating the mean level of a water pollutant for a county in CA within 15 mg/l. As part of the initial research, the researcher conducts a pilot study and finds the sampled standard deviation to be 7 mg/l. What is the minimum sample size required if the researcher wants to be confident at the 95% level?
A researcher is interested in estimating the mean time it takes adults to learn a certain...
A researcher is interested in estimating the mean time it takes adults to learn a certain task. He wants to be 90% confident that the mean time for a sample of adults is within 1.8 minutes of u. In a small pilot study the standard deviation of learning times was 6.5 minutes. How large a sample of adults should be tested? Round the critical value to three decimal places.
Suppose we are interested in estimating the proportion of a population using a simple random sample...
Suppose we are interested in estimating the proportion of a population using a simple random sample of size n. i. State a suitable estimator of the population proportion as well as its sampling distribution. Mention any assumptions which you make. ii. Explain statistically how to determine the minimum sample size necessary to estimate a population proportion to within e units. iii. Provide a practical marketing example of a 95% confidence interval for a proportion. iv. Explain the purpose of the...
A researcher is interested in estimating the mean cholesterol level in men. Based on a simple...
A researcher is interested in estimating the mean cholesterol level in men. Based on a simple random sample of 54 men, the 95% confidence interval for the population mean μ was 189.9 < μ < 210.1 A. If 100 different samples of size 54 are selected, and based on each sample, a confidence interval was constructed, exactly 95 of these confidence intervals would contain the true value of μ. B. If many different samples of size 54 are selected and,...
Suppose that a researcher is interested in estimating the mean systolic blood pressure, u, of executives...
Suppose that a researcher is interested in estimating the mean systolic blood pressure, u, of executives of major corporations. He plans to use the blood pressures of a random sample of executives of major corporations to estimate u. Assuming that the standard deviation of the population of systolic blood pressures of executives of major corporations is 25 mm Hg, what is the minimum sample size needed for the researcher to be 90% confident that his estimate is within 3 mm...
Suppose that you are interested in estimating the mean amount of soda that is placed in...
Suppose that you are interested in estimating the mean amount of soda that is placed in 2-liter bottles at the local bottling plant of a large nationally known soda company. The bottling plant has informed the inspection division that the standard deviation for 2-liter bottles is .07 liter. A random sample of fifty 2-liter bottles obtained from this bottling plant indicated a sample mean of 2.02 liters. a. What is the point estimate of the population mean? b. Calculate the...
A) If you want to be 95% confident of estimating the population mean to within a...
A) If you want to be 95% confident of estimating the population mean to within a sampling error of plus or minus 2 and the standard deviation is assumed to be 16, what sample size is required? The sample size required is _____ (Round up to the nearest integer.) B) If you want to be 95% confident of estimating the population proportion to within a sampling error of plus or minus 0.06, what sample size is needed? A sample size...
In agriculture researcher is interested in estimating the mean length of the growing season in a...
In agriculture researcher is interested in estimating the mean
length of the growing season in a region three in the last 10 years
of simple random sample he obtains the following data which
represents the number of days of the growing season what is the
point estimate of the population mean number of days of the growing
season 153,165,150,142,169,189,195,178,166,151
EQuestion Help An agricultural researcher is interested in estimating the mean length of the growing season in a region. Treating the...
If you want to be 95% confident of estimating the population mean to within a sampling...
If you want to be 95% confident of estimating the population mean to within a sampling error of plus or minus ± 5 and the standard deviation is assumed to be 17, what sample size is required? The sample size required is ________
If you want to be 95% confident of estimating the population mean to within a sampling...
If you want to be 95% confident of estimating the population mean to within a sampling error of + or - 25 and the standard deviation is assumed to be 100, what sample size is required? The sample size required is _______. (Round up to the nearest integer.)
A researcher is interested in estimating the mean time it takes adults to learn a certain task. He wants to be 90% confident that the mean time for a sample of adults is within 1.8 minutes of u. In a small pilot study the standard deviation of learning times was 6.5 minutes. How large a sample of adults should be tested? Round the critical value to three decimal places.
Suppose that a researcher is interested in estimating the mean systolic blood pressure, u, of executives of major corporations. He plans to use the blood pressures of a random sample of executives of major corporations to estimate u. Assuming that the standard deviation of the population of systolic blood pressures of executives of major corporations is 25 mm Hg, what is the minimum sample size needed for the researcher to be 90% confident that his estimate is within 3 mm...
In agriculture researcher is interested in estimating the mean
length of the growing season in a region three in the last 10 years
of simple random sample he obtains the following data which
represents the number of days of the growing season what is the
point estimate of the population mean number of days of the growing
season 153,165,150,142,169,189,195,178,166,151
EQuestion Help An agricultural researcher is interested in estimating the mean length of the growing season in a region. Treating the...
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