You would like to construct a 90% confidence interval to estimate the population mean POCB (Polychlorinated...
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You would like to construct a 90% confidence interval to estimate the population mean POCB (Polychlorinated biphenyl) level in white croaker fish from the San Francisco Bay. The random sample we select has a mean of 629 parts per million and a standard deviation of 52 parts per million. (a) What is the best point estimate, based on the sample, to use for the population mean? I parts per million (b) For each of the following sampling scenarios, determine which distribution should be used to calculate the critical value for the 90% confidence interval for the population mean. (In the table, Z refers to a standard normal distribution, and t refers to a t distribution.) Could use Unclear Sampling scenario either Z or t The sample has size 100, and it is from a non-normally distributed population. The sample has size 11, and it is from a normally distributed population with an unknown standard deviation. The sample has size 12, and it is from a normally distributed population with a known standard deviation of 53. You would like to construct a 90% confidence interval to estimate the population mean POCB (Polychlorinated biphenyl) level in white croaker fish from the San Francisco Bay. The random sample we select has a mean of 629 parts per million and a standard deviation of 52 parts per million. (a) What is the best point estimate, based on the sample, to use for the population mean? I parts per million (b) For each of the following sampling scenarios, determine which distribution should be used to calculate the critical value for the 90% confidence interval for the population mean. (In the table, Z refers to a standard normal distribution, and t refers to a t distribution.) Could use Unclear Sampling scenario either Z or t The sample has size 100, and it is from a non-normally distributed population. The sample has size 11, and it is from a normally distributed population with an unknown standard deviation. The sample has size 12, and it is from a normally distributed population with a known standard deviation of 53.
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