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Snezhnost [94]
3 years ago
10

Some of the children at a school arrrive by car.

Mathematics
1 answer:
dedylja [7]3 years ago
5 0

Answer:

0.36

Step-by-step explanation:

Percentage of boys = 60%

Percentage of girls = 100 - 60 = 40%

Percentage of boys that arrive by car

= 20% of 60%

= 0.2 x 60 = 12%

Percentage of girls that arrive by car

= 60% of 40%

= 0.6 x 40

= 24%

Total Percentage of children arrive by car

= 12 + 24

= 36%

P(Arrive by car)

= 36%

= 0.36

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Answer:

The p-value of the test is of 0.0287 < 0.05(standard significance level), which means that it can be concluded that less than half of HIV-positive smokers have used a nicotine patch.

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At the null hypothesis, we test if the proportion is of at least half, that is:

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At the alternative hypothesis, we test if the proportion is below 0.5, that is:

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