Mathematics, 18.11.2019 20:31 alexusjones6042

Aresearcher (jack) comes to you and is interested in the average length of time a computer fan will run before it needs to be cleaned?

jack believes that this time period is approximately normally distributed with a standard deviation of 30 hours.

you tell him to take a sample of computer fans.

jack comes back to you and says that he took a random sample of 36 computers, and found that the average length of time was 876 hours.

use a 94% confidence interval.

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Aresearcher (jack) comes to you and is interested in the average length of time a computer fan will...