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Andreyy89
3 years ago
9

How do I do #8? Pleas explain thank you

Mathematics
2 answers:
makkiz [27]3 years ago
6 0
Basically what u want to do is take the 36 - 12 and hopefully u should get ur answer which would be 24 inches

kirill [66]3 years ago
5 0
12 inches to 36 inches....if it is increasing (going from a smaller number to a larger number), then it is a percent increase

increase = (new number - original number) / original number...* 100
               = (36 - 12) / 12.....* 100
               = 24/12 * 100
               = 2 * 100
               = 200% increase <==

now as far as a decrease (when it goes from a larger number to a smaller number) the formula is : 
decrease = (original number - new number) / original number..* 100
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so

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Katyanochek1 [597]

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(a) Customer will not purchase the light bulbs at significance level of 0.05

(b) Customer will purchase the light bulbs at significance level of 0.01 .

Step-by-step explanation:

We are given that Light bulbs of a certain type are advertised as having an average lifetime of 750 hours. A random sample of 50 bulbs was selected,  and the following information obtained:

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Let Null hypothesis, H_0 : \mu = 750 {means that the true average lifetime is same as what is advertised}

Alternate Hypothesis, H_1 : \mu < 750 {means that the true average lifetime is smaller than what is advertised}

Now, the test statistics is given by;

       T.S. = \frac{Xbar-\mu}{\frac{s}{\sqrt{n} } } ~ t_n_-_1

where, X bar = sample mean = 738.44 hours

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               n = sample size = 50

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                            = -2.14

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Therefore, we conclude that the true average lifetime is smaller than what is advertised and so consumer will not purchase the light bulbs.

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Therefore, we conclude that the true average lifetime is same as what it has been advertised and so consumer will purchase the light bulbs.

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