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3 years ago

3/4 x 6/1 A. 9/4B. 2 1/4C. 4 1/2D. 3 3/5

Mathematics

1 answer:

Korvikt [17]3 years ago

4 0

Answer:

Step-by-step explanation:

A is the answer

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The U.S. and many other countries have recently tightened airport security. A sociologist is interested in estimating the propor

melisa1 [442]

Answer:

0.0073 < 0.05, which means that we reject the null hypothesis and conclude that the true proportion of interest is higher than 0.7.

Step-by-step explanation:

Conduct a test to determine whether the true proportion of interest is higher than 0.7.

This means that the null hypothesis is: $H_{0}: p = 0.7$

And the alternate hypothesis is: $H_{a}: p > 0.7$

The test statistic is:

$z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

In which X is the sample mean, $\mu$ is the value tested at the null hypothesis, $\sigma$ is the standard deviation and n is the size of the sample.

0.7 is tested at the null hypothesis:

This means that $\mu = 0.7, \sigma = \sqrt{0.7*0.3}$

The sociologist found that 375 of the 500 travelers randomly selected and interviewed indicated that the airports were safe.

This means that $n = 500, X = \frac{375}{500} = 0.75$

Value of the z-statistic:

$z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

$z = \frac{0.75 - 0.7}{\frac{\sqrt{0.7*0.3}}{\sqrt{350}}}$

$z = 2.44$

P-value of the test:

Probability of z being larger than 2.44, that is, a proportion larger than 0.75.

This is, looking at the z-table, 1 subtracted by the pvalue of Z = 2.44. S

Z = 2.44 has a pvalue of 0.9927

1 - 0.9927 = 0.0073

0.0073 < 0.05, which means that we reject the null hypothesis and conclude that the true proportion of interest is higher than 0.7.

8 0

3 years ago

Write 49.433 as a mixed number

RoseWind [281]

The answer should be 49 433/1000

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3 years ago

Read 2 more answers

Which statement describes a parallelogram that must be a square? A parallelogram with perpendicular diagonals. A parallelogram w

vichka [17]

Answer:

A parallelogram with diagonals that are congruent and opposite sides that are congruent.

Step-by-step explanation:

A square is defined as having all sides equal, and its interior angles all right angles (90°). From this it follows that the opposite sides are also parallel.

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3 years ago

What is the coefficient of the term of degree 4 in this polynomial

koban [17]

Answer:

The coefficient of the term of degree 4 in this polynomial is 5.

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2 years ago

The homeowner's association is sponsoring a spaghetti supper. Tickets to the event cost $10.50 per person. Sixty-two people have

den301095 [7]

Answer:

i think c

Step-by-step explanation:

not sure

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3 years ago

3/4 x 6/1 A. 9/4B. 2 1/4C. 4 1/2D. 3 3/5 ​

3/4 x 6/1 A. 9/4B. 2 1/4C. 4 1/2D. 3 3/5