# 9.1 Homework (modified r. bloom)  (Page 5/5)

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The alternate hypothesis is

• ## A

$p<0\text{.}\text{30}$
• ## B

$p\le 0\text{.}\text{30}$
• ## C

$p\ge 0\text{.}\text{30}$
• ## D

$p>0\text{.}\text{30}$

D

After conducting the test, your decision and conclusion are

• ## A

Reject ${H}_{o}$ : More than 30% of teen girls smoke to stay thin.
• ## B

Do not reject ${H}_{o}$ : Less than 30% of teen girls smoke to stay thin.
• ## C

Do not reject ${H}_{o}$ : At most 30% of teen girls smoke to stay thin.
• ## D

Reject ${H}_{o}$ : Less than 30% of teen girls smoke to stay thin.

C

The next three questions refer to the following information: A statistics instructor believes that fewer than 20% of Evergreen Valley College (EVC) students attended the opening night midnight showing of the latest Harry Potter movie. For a random sample of 84 EVC students, 11 of the students in the sample attended the midnight showing.

An appropriate alternative hypothesis is

• ## A

$p=0\text{.}\text{20}$
• ## B

$p>0\text{.}\text{20}$
• ## C

$p<0\text{.}\text{20}$
• ## D

$p\le 0\text{.}\text{20}$

C

At a 1% level of significance, an appropriate conclusion is:

• ## A

The percent of EVC students who attended the midnight showing of Harry Potter is at least 20%.
• ## B

The percent of EVC students who attended the midnight showing of Harry Potter is more than 20%.
• ## C

The percent of EVC students who attended the midnight showing of Harry Potter is less than 20%.
• ## D

There is not enough information to make a decision.

A

The Type I error is believing that the percent of EVC students who attended is:

• ## A

at least 20%, when in fact, it is less than 20%.
• ## B

20%, when in fact, it is 20%.
• ## C

less than 20%, when in fact, it is at least 20%.
• ## D

less than 20%, when in fact, it is less than 20%.

C

The next two questions refer to the following information:

It is believed that Lake Tahoe Community College (LTCC) Intermediate Algebra students get less than 7 hours of sleep per night, on average. A survey of 22 LTCC Intermediate Algebra students generated an average of 7.24 hours with a standard deviation of 1.93 hours. At a level of significance of 5%, do LTCC Intermediate Algebra students get less than 7 hours of sleep per night, on average?

The distribution to be used for this test is $\overline{X}$ ~

• ## A

$N\left(7\text{.}\text{24},\frac{1\text{.}\text{93}}{\sqrt{\text{22}}}\right)$
• ## B

$N\left(7\text{.}\text{24},1\text{.}\text{93}\right)$
• ## C

${t}_{\text{22}}$
• ## D

${t}_{\text{21}}$

D

The Type II error is “I believe that the average number of hours of sleep LTCC students get per night

• ## A

is less than 7 hours when, in fact, it is at least 7 hours.”
• ## B

is less than 7 hours when, in fact, it is less than 7 hours.”
• ## C

is at least 7 hours when, in fact, it is at least 7 hours.”
• ## D

is at least 7 hours when, in fact, it is less than 7 hours.”

D

The next three questions refer to the following information: An organization in 1995 reported that teenagers spent an average of 4.5 hours per week on the telephone. The organization thinks that, in 2007, the average is higher. Fifteen (15) randomly chosen teenagers were asked how many hours per week they spend on the telephone. The sample mean was 4.75 hours with a sample standard deviation of 2.0.

The null and alternate hypotheses are:

• ## A

${H}_{o}:\overline{x}=4\text{.}5$ , ${H}_{a}:\overline{x}>4\text{.}5$
• ## B

${H}_{o}:\mu \ge 4\text{.}5$ ${H}_{a}:\mu <4\text{.}5$
• ## C

${H}_{o}:\mu =4\text{.}\text{75}$ ${H}_{a:}\mu >4\text{.}\text{75}$
• ## D

${H}_{o}:\mu =4\text{.}5$ ${H}_{a}:\mu >4\text{.}5$

D

At a significance level of $a=0\text{.}\text{05}$ , the correct conclusion is:

• ## A

The average in 2007 is higher than it was in 1995.
• ## B

The average in 1995 is higher than in 2007.
• ## C

The average is still about the same as it was in 1995.
• ## D

The test is inconclusive.

C

The Type I error is:

• ## A

To conclude the average hours per week in 2007 is higher than in 1995, when in fact, it is higher.
• ## B

To conclude the average hours per week in 2007 is higher than in 1995, when in fact, it is the same.
• ## C

To conclude the average hours per week in 2007 is the same as in 1995, when in fact, it is higher.
• ## D

To conclude the average hours per week in 2007 is no higher than in 1995, when in fact, it is not higher.

B

#### Questions & Answers

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absolutely yes
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are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
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is Bucky paper clear?
CYNTHIA
so some one know about replacing silicon atom with phosphorous in semiconductors device?
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
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Do you know which machine is used to that process?
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how to fabricate graphene ink ?
for screen printed electrodes ?
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of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
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On having this app for quite a bit time, Haven't realised there's a chat room in it.
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Cesar
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after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
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Damian
silver nanoparticles could handle the job?
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not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
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this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
how did you get the value of 2000N.What calculations are needed to arrive at it
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