Mathematics, 02.04.2020 01:38 rehooreh14

Suppose that a certain website claims that it averages 4.7 hours of downtime per month. (Downtime is time that the site is not available.)
In a random sample of 17 months, the average downtime was 4.9 hours per month, with a standard deviation of 0.5 hours per month. What is the z-value rounded to the nearest hundredth? Is there enough evidence to reject the claim?

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Suppose that a certain website claims that it averages 4.7 hours of downtime per month. (Downtime is...

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