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The alternate hypothesis is

  • A

    p < 0 . 30 size 12{p<0 "." "30"} {}
  • B

    p 0 . 30 size 12{p<= 0 "." "30"} {}
  • C

    p 0 . 30 size 12{p>= 0 "." "30"} {}
  • D

    p > 0 . 30 size 12{p>0 "." "30"} {}

D

After conducting the test, your decision and conclusion are

  • A

    Reject H o size 12{H rSub { size 8{o} } } {} : More than 30% of teen girls smoke to stay thin.
  • B

    Do not reject H o size 12{H rSub { size 8{o} } } {} : Less than 30% of teen girls smoke to stay thin.
  • C

    Do not reject H o size 12{H rSub { size 8{o} } } {} : At most 30% of teen girls smoke to stay thin.
  • D

    Reject H o size 12{H rSub { size 8{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 . 20 size 12{p=0 "." "20"} {}
  • B

    p > 0 . 20 size 12{p>0 "." "20"} {}
  • C

    p < 0 . 20 size 12{p<0 "." "20"} {}
  • D

    p 0 . 20 size 12{p<= 0 "." "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 X ~

  • A

    N ( 7 . 24 , 1 . 93 22 ) size 12{N \( 7 "." "24", { { size 8{1 "." "93"} } over { size 8{ sqrt {"22"} } } } \) } {}
  • B

    N ( 7 . 24 , 1 . 93 ) size 12{N \( 7 "." "24",1 "." "93" \) } {}
  • C

    t 22 size 12{t rSub { size 8{"22"} } } {}
  • D

    t 21 size 12{t rSub { size 8{"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 : x ¯ = 4 . 5 size 12{H rSub { size 8{o} } : {overline {x}} =4 "." 5} {} , H a : x ¯ > 4 . 5 size 12{H rSub { size 8{a} } : {overline {x}}>4 "." 5} {}
  • B

    H o : μ 4 . 5 size 12{H rSub { size 8{o} } :μ>= 4 "." 5} {} H a : μ < 4 . 5 size 12{H rSub { size 8{a} } :μ<4 "." 5} {}
  • C

    H o : μ = 4 . 75 size 12{H rSub { size 8{o} } :μ=4 "." "75"} {} H a : μ > 4 . 75 size 12{H rSub { size 8{a:} } μ>4 "." "75"} {}
  • D

    H o : μ = 4 . 5 size 12{H rSub { size 8{o} } :μ=4 "." 5} {} H a : μ > 4 . 5 size 12{H rSub { size 8{a} } :μ>4 "." 5} {}

D

At a significance level of a = 0 . 05 size 12{a=0 "." "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

What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
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.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
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.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Collaborative statistics homework book: custom version modified by r. bloom. OpenStax CNX. Dec 23, 2009 Download for free at http://legacy.cnx.org/content/col10619/1.2
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