1. Suppose a random variable X has a population mean of = 40,000 and a population standard deviation of = 8,000. If a random sample of n = 400 is taken, what is the value for the population standard deviation of the sample mean?

1. Suppose a random variable X has a population mean of = 40,000 and a population standard deviation of = 8,000. If a random sample of n = 400 is taken, what is the probability that the sample mean will fall between 40,000 and 41,000?
2. Suppose a random variable X has a population mean of = 40,000 and a population standard deviation of = 8,000. If a random sample of n = 100 is taken, what is the probability that the sample mean will fall between 40,000 and 41,000?
3. Suppose a random variable X has a population mean of = 40,000 and a population standard deviation of = 8,000. If a random sample of n = 100 is taken, what is the probability that the sample mean will fall between 39,000 and 42,000?
4. In estimating, suppose a sample size of n = 100 is taken and we know the population standard deviation = 1000. What is the value of the margin of error for a 95% confidence interval estimate?
5. In estimating, suppose a sample size of n = 100 is taken and we know the population standard deviation = 1000. If the sample mean was found to be 800, what is the upper and lower bound of the 95% confidence interval estimate of the population mean?
6. In estimating, suppose a sample size of n = 400 is taken and we know the population standard deviation = 1000. If the sample mean was found to be 800, what is the upper and lower bound of the 95% confidence interval estimate of the population mean?
7. In estimating, suppose a sample size of n = 25 is taken and we calculate a sample standard deviation s = 1000. If the sample mean was found to be 800, what is the upper and lower bound of the 95% confidence interval estimate of the population mean?
8. In estimating, suppose a sample size of n = 16 is taken and we calculate a sample standard deviation s = 1000. If the sample mean was found to be 800, what is the upper and lower bound of the 95% confidence interval estimate of the population mean?
9. In estimating, suppose a sample size of n = 25 is taken and we calculate a sample standard deviation s = 1000. If the sample mean was found to be 800, what is the upper and lower bound of the 99% confidence interval estimate of the population mean?

1. Suppose the sample standard deviation s = 50 and the sample size n = 25. What is the sample standard deviation of the sample mean?

1. A random sample of 500 likely voters is taken and 300 indicate they plan on voting for Candidate A. What is the value for the sample proportion of those planning to vote for Candidate A?
2. A random sample of 100 likely voters is taken and the sample proportion of those favoring a tax cut is 0.50. What is the value for the margin of error for a 95% confidence interval estimate of the population proportion?
3. A random sample of 100 likely voters is taken and the sample proportion of those favoring a tax cut is 0.50. What are the values for the upper and lower bounds for a 95% confidence interval estimate of the population proportion?