# Question: An industrial process produces batches of a chemical whose impurity

An industrial process produces batches of a chemical whose impurity levels follow a normal distribution with standard deviation 1.6 grams per 100 grams of chemical. A random sample of 100 batches is selected in order to estimate the population mean impurity level.

a. The probability is 0.05 that the sample mean impurity level exceeds the population mean by how much?

b. The probability is 0.10 that the sample mean impurity level is below the population mean by how much?

c. The probability is 0.15 that the sample mean impurity level differs from the population mean by how much?

a. The probability is 0.05 that the sample mean impurity level exceeds the population mean by how much?

b. The probability is 0.10 that the sample mean impurity level is below the population mean by how much?

c. The probability is 0.15 that the sample mean impurity level differs from the population mean by how much?

**View Solution:**## Answer to relevant Questions

The price-earnings ratios for all companies whose shares are traded on the New York Stock Exchange follow a normal distribution with a standard deviation of 3.8. A random sample of these companies is selected in order to ...A town has 500 real estate agents. The mean value of the properties sold in a year by these agents is $800,000, and the standard deviation is $300,000. A random sample of 100 agents is selected, and the value of the ...A population contains 6 million 0s and 4 million 1s. What is the approximate sampling distribution of the sample mean in each of the following cases? a. The sample size is n = 5 b. The sample size is n = 100 A store has determined that 30% of all lawn mower purchasers will also purchase a service agreement. In 1 month 280 lawn mowers are sold to customers, who can be regarded as a random sample of all purchasers. a. What is the ...An employee survey conducted two years ago by Rice Motors, Inc., found that 53% of its employees were concerned about future health care benefits. A random sample of 80 of these employees were asked if they were now ...Post your question