What is it called when all the items in the population have the same chance of b

Question

What is it called when all the items in the population have the same chance of being selected for the sample? What is the difference between a sample mean and the population mean called? If the level of confidence is lowered from 95% to 90%, but the allowable error and the standard deviation remain the same, what happens to the required sample size? Manufactures were subdivided into groups by volume of sales. Those with more than $100 million in sales were classified as Class A large; those from $50 to $100 million as Class A medium; and those between $25 and $50 million as Class A small, and so on. Samples were then selected from each of these groups. What is this type of sampling called? A normal population has a mean of 60 and a standard deviation of 12. You select a random sample of 9. What is the probability the sample mean is between 54 and 62? A random sample of 85 group leaders, supervisors, and similar personnel revealed that on average a person spent 6.5 years on the job before being promoted. The standard deviation of the sample was 1.7 years. Using the 0.95 degree of confidence, what is the confidence interval within which the population mean lies? Mileage tests were conducted on a randomly selected sample of 100 newly developed automobile tires. The average tread wear was found to be 50,000 miles with a standard deviation of 3,500 miles. What is the best estimate of the average tread life in miles for entire population of these tires?

Explanation / Answer

18.

If all the items in the population have the same chance of being selected for the sample then this probably sampling.

Probably sampling better known as probability sampling is a process where all items in the population have equal chance of being chosen.

Answer: e

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