The length of stay (in hours) for a sample of 12 pneumonia patients at Santa Theresa Memorial Hospital was found to have a mean of 126 hours and a standard deviation of 21.663 hours. Find the 90 percent confidence interval on the standard deviation of the length of stay.

This question still have no answer summary yet.

The length of stay (in hours) for a sample of 12 pneumonia patients at Santa Theresa Memorial Hospital was found to have a mean of 126 hours and a standard deviation of 21.663 hours. Find the 90 percent confidence interval on the standard deviation of the length of stay.
---
sample mean = 126
margin of error = 1.645*21.663/sqrt(12) = 10.29
---
90%CI: 126-10.29 < u < 126+10.29
============
Cheers,
Stan H.
============

Did this answer your question? If not, ask a new question.

- The length of stay (in hours) for a sample of 12 pneumonia patients at Santa Theresa Memorial Hospital was found to have a mean of 126 hours and a standard deviation of 21.663 hours
The length of stay (in hours) for a sample of 12 pneumonia patients at Santa The...

- In a study of the time college freshmen use to study each week, it is found that the
mean is 6.8 hours with a standard deviation of 2.5 hours
In a study of the time college freshmen use to study each week, it is found that...

- A recent survey shows that the average man will spend 141,288 hours sleeping, 85,725 hours working, 81,681 hours watching television 9,945 hours commuting, 1,662 hours kissing, and 363,447 hours on other tasks during his lfetime
A recent survey shows that the average man will spend 141,288 hours sleeping, 85...

- The average of lifetime of a light bulb is 3000 hours with a standard deviation of 696 hours
The average of lifetime of a light bulb is 3000 hours with a standard deviation ...

- The average of lifetime a light bulb is 3000 hours with a standard deviation of 696 hours
The average of lifetime a light bulb is 3000 hours with a standard deviation of ...

- The lifetime of a SuperTough AAA battery is normally distributed with mean of 28.5 hours and standard deviation of 5.3 hours
The lifetime of a SuperTough AAA battery is normally distributed with mean of 28...

- The lifetime of ZZZ batteries are normally distributed with a mean of 265 hours and a standard deviation of 10 hours
The lifetime of ZZZ batteries are normally distributed with a mean of 265 hours ...

- the bulbs manufactured by a company gave a mean life of 3000 hours with standard deviation of 400 hours
the bulbs manufactured by a company gave a mean life of 3000 hours with standard...

- A certain type of mechanical devices require repairs according to a normal distribution with a mean of 200 hours and a standard deviation of 30 hours
A certain type of mechanical devices require repairs according to a normal distr...

- A consumer buys n light bulbs, each of which has a lifetime that has a mean of 800 hours, a standard deviation of 100 hours, and a normal distribution
A consumer buys n light bulbs, each of which has a lifetime that has a mean of 8...