What is 1/18 repeating as a decimal
2 answers:
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Answer:
94% confidence interval for the average length of time a computer fan will run before it needs to be cleaned is between 866.6 and 885.4 hours
Step-by-step explanation:
94% confidence interval can be calculated using M±ME where
- M is the sample average length of time before it needs to be cleaned. (876 hours)
- ME is the margin of error from the mean
margin of error (ME) around the mean using the formula
ME= where
- z is the corresponding statistic in the 94% confidence level (1.88)
- s is the standard deviation of the time periods before it needs to be cleaned (30 hours)
- N is the sample size (36)
Using the numbers we get ME= =9.4
Then the 94% confidence interval is 876±9.4