# 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

where we get a research paper on Nano chemistry....?
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
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
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
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
what about nanotechnology for water purification
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
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?
what is a peer
What is meant by 'nano scale'?
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 ?
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?
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
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