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Try these multiple choice questions.

For questions [link][link] , use the following information.

A new AIDS prevention drugs was tried on a group of 224 HIV positive patients. Forty-five (45) patients developed AIDS after four years. In a control group of 224 HIV positive patients, 68 developed AIDS after four years. We want to test whether the method of treatment reduces the proportion of patients that develop AIDS after four years or if the proportions of the treated group and the untreated group stay the same.

Let the subscript t size 12{t} {} = treated patient and ut size 12{ ital "ut"} {} = untreated patient.

The appropriate hypotheses are:

  • H o : p t < p ut size 12{H rSub { size 8{o} } :p rSub { size 8{t} }<p rSub { size 8{ ital "ut"} } } {} and H a : p t p ut size 12{H rSub { size 8{a} } :p rSub { size 8{t} }>= p rSub { size 8{ ital "ut"} } } {}
  • H o : p t p ut size 12{H rSub { size 8{o} } :p rSub { size 8{t} }<= p rSub { size 8{ ital "ut"} } } {} and H a : p t > p ut size 12{H rSub { size 8{a} } :p rSub { size 8{t} }>p rSub { size 8{ ital "ut"} } } {}
  • H o : p t = p ut size 12{H rSub { size 8{o} } :p rSub { size 8{t} } =p rSub { size 8{ ital "ut"} } } {} and H a : p t p ut size 12{H rSub { size 8{a} } :p rSub { size 8{t} }<>p rSub { size 8{ ital "ut"} } } {}
  • H o : p t = p ut size 12{H rSub { size 8{o} } :p rSub { size 8{t} } =p rSub { size 8{ ital "ut"} } } {} and H a : p t < p ut size 12{H rSub { size 8{a} } :p rSub { size 8{t} }<p rSub { size 8{ ital "ut"} } } {}

D

If the p -value is 0.0062 what is the conclusion (use α = 0.05 size 12{α=5%} {} )?

  • The method has no effect.
  • There is sufficient evidence to conclude that the method reduces the proportion of HIV positive patients that develop AIDS after four years.
  • There is sufficient evidence to conclude that the method increases the proportion of HIV positive patients that develop AIDS after four years.
  • There is insufficient evidence to conclude that the method reduces the proportion of HIV positive patients that develop AIDS after four years.

B

Lesley E. Tan investigated the relationship between left-handedness and right-handedness and motor competence in preschool children. Random samples of 41 left-handers and 41 right-handers were given several tests of motor skills to determine if there is evidence of a difference between the children based on this experiment. The experiment produced the means and standard deviations shown below. Determine the appropriate test and best distribution to use for that test.

Left-handed Right-handed
Sample size 41 41
Sample mean 97.5 98.1
Sample standard deviation 17.5 19.2

  • Two independent means, normal distribution
  • Two independent means, student's-t distribution
  • Matched or paired samples, student's-t distribution
  • Two population proportions, normal distribution

B

For questions [link][link] , use the following information.

An experiment is conducted to show that blood pressure can be consciously reduced in people trained in a “biofeedback exercise program.” Six (6) subjects were randomly selected and the blood pressure measurements were recorded before and after the training. The difference between blood pressures was calculated after before size 12{ left ( ital "after" - ital "before" right )} {} producing the following results: x ¯ d = 10 . 2 size 12{ {overline {x}} rSub { size 8{d} } = - "10" "." 2} {} s d = 8 . 4 size 12{s rSub { size 8{d} } =8 "." 4} {} . Using the data, test the hypothesis that the blood pressure has decreased after the training,

The distribution for the test is

  • t 5 size 12{t rSub { size 8{5} } } {}
  • t 6 size 12{t rSub { size 8{6} } } {}
  • N ( 10 . 2,8 . 4 ) size 12{N \( - "10" "." 2,8 "." 4 \) } {}
  • N ( 10 . 2, 8 . 4 6 ) size 12{N \( - "10" "." 2, { { size 8{8 "." 4} } over { size 8{ sqrt {6} } } } \) } {}

A

If α = 0 . 05 size 12{a=0 "." "05"} {} , the p size 12{p} {} -value and the conclusion are

  • 0.0014; There is sufficient evidence to conclude that the blood pressure decreased after the training
  • 0.0014; There is sufficient evidence to conclude that the blood pressure increased after the training
  • 0.0155; There is sufficient evidence to conclude that the blood pressure decreased after the training
  • 0.0155; There is sufficient evidence to conclude that the blood pressure increased after the training

C

For questions [link][link] , use the following information.

Questions & Answers

are nano particles real
Missy Reply
yeah
Joseph
Hello, if I study Physics teacher in bachelor, can I study Nanotechnology in master?
Lale Reply
no can't
Lohitha
where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
has a lot of application modern world
Kamaluddeen
yes
narayan
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
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 (custom online version modified by t. short). OpenStax CNX. Jul 15, 2013 Download for free at http://cnx.org/content/col11476/1.5
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