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?

The z-value rounded to the nearest hundredth is -1.64

There is no enough evidence to reject the claim.

Step-by-step explanation:

A certain website claims that it averages 4.7 hours of downtime per month.

No. of samples = n = 17

Mean =

Standard deviation =

Formula:

Z =−1.64

Z critical at 90% is 1.65

Since Z calculated < Z critical

So, there is no enough evidence to reject the claim.

step-by-step explanation:

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step-by-step explanation: