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Sidana [21]
3 years ago
10

I need help with all of number 2 pls

Mathematics
1 answer:
Liula [17]3 years ago
7 0
Well just try to add the stuff from the top and add it 
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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
Find the area of the trapezoid shown below. {?} square feet
PolarNik [594]

Answer:

432

Step-by-step explanation:

6 0
2 years ago
This Geometry and is in the topic of inequalities
Anna71 [15]
THE CORRECT ANSWER TO THAT IS D
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3 years ago
A chicken weighs pounds and needs to be cooked 20 minutes per pound plus an extra 15 minutes used expression 20+15 to find how l
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Answer:

20m

Step-by-step explanation:

7 0
3 years ago
There are 412 students at sunshine middle school. 225 students are in 5th 6th grade and the rest are in 7th or 8th grades. How m
Arada [10]

Answer:

187 students in 7th or 8th grade

17,088 pages

Step-by-step explanation:

412 - 225 is 187.

A dozen is 12

12 x 16 x 89 = 17,088

4 0
3 years ago
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