Question: You would like to construct a 90% confidence interval to estimate the population mean POCB (Polychlorinated biphenyl) level in white croaker fish from the

You would like to construct a 90% confidence interval to estimate the

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.

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock blur-text-image

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Students Have Also Explored These Related Mathematics Questions!

Construct a 90% confidence interval to estimate the population mean using the following data: x = 75 = 20 n = 36

Construct a 90% confidence interval to estimate the population mean using the following data: x = 25 = 5.2 n = 21 What assumptions need to be made about this population?

Construct a 95% confidence interval to estimate the population mean using the following data: x = 38 = 8.5 n = 25 What assumptions need to be made about this population?

A nationally known supermarket decided to promote its own brand of soft drinks on TV for two weeks. Before the ad campaign, the company randomly selected 21 of its stores across the United States to...

The branch manager of an outlet (Store 1) of a nationwide chain of pet supply stores wants to study characteristics of her customers. In particular, she decides to focus on two variables: the amount...

Scarlett and Heather, the owners of an upscale restaurant in Dayton, Ohio, want to study the dining characteristics of their customers. They decide to focus on two variables: the amount of money...

A random sample of n = 9 values taken from a normally distributed population with a population variance of 25 resulted in the following sample values: Use the sample values to construct a 90%...

A meat-processing company in the Midwest produces and markets a package of eight small sausage sandwiches. The product is nationally distributed, and the company is interested in knowing the average...

Some fast-food chains offer a lower-priced combination meal in an effort to attract budget-conscious customers. One chain test-marketed a burger fries and a drink combination for $1.71. The weekly...

A national survey of insurance offices was taken, resulting in a random sample of 245 companies. Of these 245 companies, 189 responded that they were going to purchase new software for their offices...

A saturated vapor stream containing 10.9 mole% propane, 75.2% isobutene, and 13.9% n-butane passes from the top of a distillation column to a total condenser seventy-five percent of the condensate is...

Meta-data can be roughly thought of as the envelope of a message. For example, the meta-data of a phone call would include information on the caller, callee, time, date, length, but not the actual...

Find the derivative. f ( x ) = 5 x 4 - 2 x 3 - 4

Prezas Company's balance sheet showed total current assets of $3,250, all of which were required in operations. Its current liabilities consisted of $975 of accounts payable, $600 of 6% short-term...

Vasudevan Inc. recently reported operating income of $5.35 million, depreciation of $1.20 million, and had a tax rate of 40%. The firm's expenditures on fixed assets and net operating working capital...

1. Classify the following materials into elements, compounds, or mixtures. 1. gold 2. steel 3. paper 4. milk 5. cotton 6. mayonnaise 7. sand and stone 8. gasoline 9. sugar water 10. iron oxide 11....

A tank is filled with 1000 liters of pure water. Brine containing 0.03 kg of salt per liter enters the tank at 10 liters per minute. Another brine solution containing 0.05 kg of salt per liter enters...

Motivational interviewing Give an example of a reason statement indicating change talk

145 4 In January 2021, Company Monast's stock is traded at $150. The following table provides the premiums of March, April, and May maturity options with different strike prices on Company Monaslys...

could you please do all of these questions , thank you so much , i really appreciate it. thumb up for sure. :) In January 2022, Company Monash's stock is traded at $150. The following table provides...

Same answer set for each question Data File: Stadium Expansion v7.xlsx A national sports team plans to expand their stadium. The team asks construction companies to send their bids for the expansion...

Sharkey's Fun Center contains a number of electronic games as well as a miniature golf course and various rides located outside the building. Paul Sharkey, the owner, would like to construct a water...

Excel Lab: Finding the Margin of Error Problem 1 - Any Smartphones for Sale? A random sample of the newest model of Samsung Galaxy smartphones being sold over the Internet had the following prices,...

In January 2022, Company Monash's stock is traded at $150. The following table provides the premiums of March, April, and May maturity options with different strike prices on Company Monash's...