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ella3714
27.08.2019 •
Mathematics
Acomputer manufacturer estimates that its cheapest screens will last less than 2.8 years. a random sample of 61 of these screens has a mean life of 2.6 years. the population is normally distributed with a population standard deviation of 0.88 years. at α=0.02, what type of test is this and can you support the organization’s claim using the test statistic?
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Ответ:
Claim : A computer manufacturer estimates that its cheapest screens will last less than 2.8 years.
n = 61
Since n > 30
So , we will use z test
x = 2.6
Formula :![z = \frac{x-\mu}{\frac{\sigma}{\sqrt{n}}}](/tpl/images/0203/2338/d7800.png)
Refer the z table
p =0.0384
α=0.02
p value > α
So, we accept the null hypothesis
So, the claim is false that A computer manufacturer estimates that its cheapest screens will last less than 2.8 years
Ответ:
50 dollars got it right
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