# statistics

posted by .

A university has 1000 computers available for students to use. Each computer has a 250 gigabyte hard drive. The university wants to estimate the space occupied on the hard drives. A random sample of 100 computers showed a mean of 115 gigabytes used with a standard deviation of 20 gigabytes. What is the standard error of the mean

• statistics -

standard error mean=20/sqrt(100)=+-2gigabites.

That is, the sample mean is within +-2 gigabites for the real mean 68 percent of the time.

## Similar Questions

1. ### ict

why does a computer need a floopy drive as well as a hard drive It doesn't . None of my computers have floppy drives. Floppy drives were used in ancient times to have portable data input/export. These days we use CD/DVD drives and …
2. ### statistics

2. The director of admissions at a large university advises students that the cost of textbooks will average more than \$300 for a typical semester. A random sample of 80 students enrolled in the university shows a sample mean cost …
3. ### Computer

Your computer is running very slow. The LED light for the hard drive blinks nearly continually, indicating that the hard drive is spinning even when data is not being saved or read from the hard drive. Based on this scenario, what …
4. ### statistics

The GPAs of all students enrolled at a large university have an approximately normal distribution with a mean of 3.02 and a standard deviation of .29. Find the probability that the mean GPA of a random sample of 20 students selected …
5. ### Statistics

A university has 1,000 computers available for students to use. Each computer has a 250-gigabyte hard drive. The university wants to estimate the space occupied on the hard drives. A random sample of 100 computers showed a mean of …
6. ### psychology

20 You are trying to boot your computer but your computer keeps displaying a message after the POST that says â€œ'invalid specificationâ€. What does the error mean?
7. ### computer Science

20 You are trying to boot your computer but your computer keeps displaying a message after the POST that says â€œ'invalid specificationâ€. What does the error mean?
8. ### computer Science

20 You are trying to boot your computer but your computer keeps displaying a message after the POST that says â€œ'invalid specificationâ€. What does the error mean?
9. ### Computer Literacy

2. Which of the following components was a significant development featured in the Macintosh LISA computer?
10. ### Statistics

80. Florida State University has 14 statistics classes scheduled for its Summer 2013 term. One class has space available for 30 students, eight classes have space for 60 students, one class has space for 70 students, and four classes …

More Similar Questions