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 115 gigabytes used with a standard deviation of 20 gigabytes. a-  What is the standard error of the mean?  b-  What is the probability that a sample mean is greater than 120 gigabytes?  c-  What is the probability that a sample mean is between 111 and 119 gigabytes?

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Q: knowing the mean will be within ±0.5 mm?

A:

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.