# Question: A precision instrument is checked by making 12 readings on

A precision instrument is checked by making 12 readings on the same quantity. The population distribution of readings is normal.

a. The probability is 0.95 that the sample variance is more than what percentage of the population variance?

b. The probability is 0.90 that the sample variance is more than what percentage of the population variance?

c. Determine any pair of appropriate numbers, a and b, to complete the following sentence: The probability is 0.95 that the sample variance is between a% and b% of the population variance.

a. The probability is 0.95 that the sample variance is more than what percentage of the population variance?

b. The probability is 0.90 that the sample variance is more than what percentage of the population variance?

c. Determine any pair of appropriate numbers, a and b, to complete the following sentence: The probability is 0.95 that the sample variance is between a% and b% of the population variance.

## Answer to relevant Questions

A drug company produces pills containing an active ingredient. The company is concerned about the mean weight of this ingredient per pill, but it also requires that the variance (in squared milligrams) be no more than 1.5. A ...A company services home air conditioners. It has been found that times for service calls follow a Normal distribution with a mean of 60 minutes and a standard deviation of 10 minutes. A random sample of four service calls ...Plastic bags used for packaging produce are manufactured so that the breaking strengths of the bags are normally distributed with a standard deviation of 1.8 pounds per square inch. A random sample of 16 bags is selected. a. ...A consumer product that has flourished in the last few years is bottled natural spring water. Jon Thorne is the CEO of a company that sells natural spring water. He has requested a report of the filling process of the ...The demand for bottled water increases during the hurricane season in Florida. The operations manager at a plant that bottles drinking water wants to be sure that the filling process for 1-gallon bottles (1 gallon is ...Post your question