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2 years ago

Select the correct answer.

Mathematics

2 answers:

Bogdan [553]2 years ago

7 0

Answer:

C. 044

Step-by-step explanation:

Probability of oil:

P(oil) = 45%

Probability of no oil:

P(no oil) = 100% - 45% = 55% = 0.55

Probability of testing for no oil:

P(test no oil) = 0.55*0.8 = 0.44

Correct choice is C

777dan777 [17]2 years ago

3 0

Answer:

the answer is A. 0.09

Step-by-step explanation:

internet :)

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3 years ago

4. According to statistics reported on IN-CORP a surprising number of motor vehicles are not covered by insurance. Sample result

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Answer:

a) 0.23

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Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

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Point estimate

The point estimate is:

$\pi = \frac{46}{200} = 0.23$

95% confidence level

So $\alpha = 0.05$ , z is the value of Z that has a pvalue of $1 - \frac{0.05}{2} = 0.975$ , so $Z = 1.96$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.23 - 1.96\sqrt{\frac{0.23*0.77}{200}} = 0.1717$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.23 + 1.96\sqrt{\frac{0.23*0.77}{200}} = 0.2883$

The 95% confidence interval for the population proportion is (0.1717, 0.2883).

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2 years ago