<< Chapter < Page Chapter >> Page >

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

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
Do somebody tell me a best nano engineering book for beginners?
s. Reply
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
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
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
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
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
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
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Berger describes sociologists as concerned with
Mueller Reply
Got questions? Join the online conversation and get instant answers!
QuizOver.com Reply

Get the best Algebra and trigonometry course in your pocket!





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
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Collaborative statistics homework book: custom version modified by r. bloom' conversation and receive update notifications?

Ask