An insurance company checks police records (in a city) on 500 accidents selected at

random and notes that teenagers were at the wheel in 120 of them. It is desired to test
if this information indicate that more than 20% of auto accidents involve teenage drivers
in the city. State the decision about H0 and make the conclusion about Ha.

You can try a proportional one-sample z-test for this one since this problem is using proportions.

Using a formula for a proportional one-sample z-test with your data included, we have:
z = .24 - .20 -->test value (120/500 is .24) minus population value (.20) divided by
√[(.20)(.80)/500] --> .80 represents 1-.20 and 500 is sample size.

Finish the calculation. Remember if the null is not rejected, then there is no difference. If the null is rejected, then p > .20.

I hope this will help.

Which sentence supports the idea that teenagers behind the wheel of a car cause more accidents than adult drivers?

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The demands of being a teenager, going to school, getting good grades, finding one's self, and planning out the future are stressful.
For example, the U.S. Department of Transportation says that in 2004 60% of the accidents in the U.S. involved drivers younger than 18.
An 18 year old is considered an adult; however, in many states, this does not mean he or she can drink legally since that legal age is 21.
For example, if an 18-year-old had the choice, he or she would rather drive faster than slower when on the freeway.

"For example, the U.S. Department of Transportation says that in 2004 60% of the accidents in the U.S. involved drivers younger than 18." supports the idea that teenagers behind the wheel of a car cause more accidents than adult drivers.

Lorne is writing his band instructor to explain why he believes the band should offer private lessons in addition to the normal classroom instruction. Which sentence is a good reason to include in his letter to the band instructor?

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Private lessons could be offered after school and before school.
Private lessons include training in reading music, as well as playing music.
Private lessons mean added practice which will make the band play better together.
Mr. Corac teaches English, but he is trained in classical music.

"Private lessons mean added practice which will make the band play better together." is a good reason to include in Lorne's letter to the band instructor.

Felix has been assigned a research paper about school uniforms and whether or not they can help keep schools safe. He is of the opinion that school uniforms should not be required. He thinks that choosing their own clothes is important to helping students express themselves. Which of the following is the best research source for Felix to use in order to help him prove his point?

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a teenage fashion magazine
newspaper article about school safety
encyclopedia entry about clothing
directory for local high schools

A teenage fashion magazine is the best research source for Felix to use in order to help him prove his point about clothing being important for students to express themselves and thus, school uniforms should not be required.

Ariana has been assigned an argumentative essay about the use of laptops in the middle school classroom.Which resource would be best in helping her to determine her position and support her ideas?

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an educational journal discussing the rewards of technology in the classroom
an encyclopedia article about the development of the laptop
a map of the state showing the location of all the middle schools
a blog written by a middle school student sharing his day-to-day experiences

An educational journal discussing the rewards of technology in the classroom would be best to help Ariana to determine her position and support her ideas regarding the use of laptops in the middle school classroom.

Michael is writing an article about the negative effects of playing video games. Which fact would be support his argument?

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Playing video games makes young adults mentally stronger and sharper.
Playing video games can lead to a lack of concentration and productivity among young adults.
Playing video games can teach adolescents the importance of cooperation and teamwork.
Playing video games decreases stress levels among young adults.