# 8.1 Practice final exam 2

This module is a practice final for an associated elementary statistics textbook, Collaborative Statistics, available for Fall 2008.

A study was done to determine the proportion of teenagers that own a car. The population proportion of teenagers that own a car is the

• statistic
• parameter
• population
• variable

B: parameter

The next two questions refer to the following data:

value frequency
0 1
1 4
2 7
3 9
6 4

The box plot for the data is:

A

If 6 were added to each value of the data in the table, the 15th percentile of the new list of values is:

• 6
• 1
• 7
• 8

C: 7

The next two questions refer to the following situation:

Suppose that the probability of a drought in any independent year is 20%. Out of those years in which a drought occurs, the probability of water rationing is 10%. However, in any year, the probability of water rationing is 5%.

What is the probability of both a drought and water rationing occurring?

• 0.05
• 0.01
• 0.02
• 0.30

C: 0.02

Which of the following is true?

• drought and water rationing are independent events
• drought and water rationing are mutually exclusive events
• none of the above

C: none of the above

The next two questions refer to the following situation:

Suppose that a survey yielded the following data:

Favorite pie type
gender apple pumpkin pecan
female 40 10 30
male 20 30 10

Suppose that one individual is randomly chosen. The probability that the person’s favorite pie is apple or the person is male is:

• $\frac{40}{60}\text{}$
• $\frac{60}{140}\text{}$
• $\frac{120}{140}\text{}$
• $\frac{100}{140}\text{}$

D: $\frac{100}{140}\text{}$

Suppose ${H}_{o}$ is: Favorite pie type and gender are independent.

The $\text{p-value}$ is:

• ≈ 0
• 1
• 0.05
• cannot be determined

A: ≈ 0

The next two questions refer to the following situation:

Let’s say that the probability that an adult watches the news at least once per week is 0.60. We randomly survey 14 people. Of interest is the number that watch the news at least once per week.

Which of the following statements is FALSE?

• $X~B\left(14,0.60\right)$
• The values for $x$ are: $\left\{1,2,3,\mathrm{...},\mathrm{14}\right\}$
• $\mu =8.4$
• $P\left(X=5\right)=0.0408$

B: The values for $x$ are: $\left\{1,2,3,\mathrm{...},\mathrm{14}\right\}$

Find the probability that at least 6 adults watch the news.

• $\frac{6}{14}\text{}$
• 0.8499
• 0.9417
• 0.6429

C: 0.9417

The following histogram is most likely to be a result of sampling from which distribution?

• Chi-Square with df = 6
• Exponential
• Uniform
• Binomial

D: Binomial

The ages of campus day and evening students is known to be normally distributed. A sample of 6 campus day and evening students reported their ages (in years) as: $\left\{\mathrm{18},\mathrm{35},\mathrm{27},\mathrm{45},\mathrm{20},\mathrm{20}\right\}$

What is the error bound for the 90% confidence interval of the true average age?

• 11.2
• 22.3
• 17.5
• 8.7

D: 8.7

If a normally distributed random variable has $µ=0$ and $\sigma =1$ , then 97.5% of the population values lie above:

• -1.96
• 1.96
• 1
• -1

A: -1.96

The next three questions refer to the following situation:

The amount of money a customer spends in one trip to the supermarket is known to have an exponential distribution. Suppose the average amount of money a customer spends in one trip to the supermarket is $72. What is the probability that one customer spends less than$72 in one trip to the supermarket?

• 0.6321
• 0.5000
• 0.3714
• 1

A: 0.6321

How much money altogether would you expect next 5 customers to spend in one trip to the supermarket (in dollars)?

• 72
• $\frac{{72}^{2}}{5}\text{}$
• 5184
• 360

D: 360

Is there any normative that regulates the use of silver nanoparticles?
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
why we need to study biomolecules, molecular biology in nanotechnology?
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
why?
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?
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
what does nano mean?
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?
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
it is a goid question and i want to know the answer as well
Maciej
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
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
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
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?
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 ?
for screen printed electrodes ?
SUYASH
What is lattice structure?
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
While the American heart association suggests that meditation might be used in conjunction with more traditional treatments as a way to manage hypertension
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