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Questions 1, 2, and 3 refer to the following:

In a study of a sample of 35 Computer Science majors and 40 Business majors, the average number of science fiction books each group read per year was recorded. The Computer Science majors read an average of 11 books with a standard deviation of 4 books. The Business majors read an average of 9 books with a standard deviation of 4.5 books. We are interested in whether the average number of science fiction books read by the Computer Science majors is the same as the number read by the Business majors. CS = Computer Science majors B = Business majors

The alternate hypothesis is:

  • A

    mCS = mB
  • B

    mCS¹mB
  • C

    mCS<mB
  • D

    mCS>mB

B

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The exact distribution for the test is:

  • A

    Normal
  • B

    Student-t with df»72.9775
  • C

    Exponential
  • D

    Uniform

C

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The p-value is

  • A

    0.0452
  • B

    2.0376
  • C

    0.0226
  • D

    0

A

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Questions 4 and 5 refer to the following:

Suppose that a random survey of 10 teenagers found that the average amount of time they spend on the Internet each day is 3.2 hours with a sample standard deviation of 0.78 hours.

The point estimate of the population average amount of time teenagers spend on the Internet each day is

  • A

    0.78 hours
  • B

    32 hours
  • C

    3.2 hours
  • D

    unknown

C

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An 87% confidence interval for the average amount of time a teenager spends on the Internet each day would be

  • A

    (2.71, 3.68)
  • B

    (2.83, 3.57)
  • C

    (2.64, 3.76)
  • D

    (2.79, 3.61)

D

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Which of the following is TRUE about a 99% confidence interval for the true average amount of time that teenagers spend on the Internet each day?

  • I

    We are 99% confident that the true average time that teenagers spend on the Internet per day lies within the confidence interval.
  • Ii

    The confidence interval contains 99% of the data values collected.
  • Iii

    99% of all the confidence intervals constructed this way contain the true average amount of time teenagers spend on the Internet each day.
  • A

    I, II, and III
  • B

    I and II
  • C

    I and III
  • D

    I only

C

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Questions 7 and 8 refer to the following:

Suppose a random survey of 600 registered voters revealed that only 39% actually voted in the last primary election. We are interested in the population proportion of registered voters who actually voted in the last primary election.

The margin of error (error bound) for a 92% confidence interval for the true proportion of registered voters who actually voted in the last primary election is

  • A

    0.0176
  • B

    0.3900
  • C

    0.3551
  • D

    0.0349

D

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Suppose you want to redo the survey of registered voters to see how many voted in the last election but this time you survey 1000 registered voters and find 340 voted in the last election. If the confidence level is maintained at 92% what happens to the confidence interval.

  • A

    The confidence interval gets wider.
  • B

    The confidence interval gets narrower.
  • C

    The confidence interval stays the same.
  • D

    The confidence interval cannot be calculated.

B

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A study of a certain brand of AA batteries yielded a sample mean lifetime of 450 minutes with a sample standard deviation of 92 minutes. A hypothesis test was performed using the following hypotheses:

H o : m = 480

H a : m<480

The type I error for this hypothesis test is:

  • A

    to conclude that the average battery lifetime is less than 480 minutes when, in reality, it is equal to 480 minutes
  • B

    to conclude that the average battery lifetime is equal to 480 minutes when, in reality, it actually is equal to 480 minutes
  • C

    to conclude that the average battery lifetime is equal to 480 minutes when, in reality, it is less than 480 minutes
  • D

    to conclude that the average battery lifetime is greater than 480 minutes when, in reality, it is equal to 480 minutes

A

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Questions & Answers

how does Neisseria cause meningitis
Nyibol Reply
what is microbiologist
Muhammad Reply
what is errata
Muhammad
is the branch of biology that deals with the study of microorganisms.
Ntefuni Reply
What is microbiology
Mercy Reply
studies of microbes
Louisiaste
when we takee the specimen which lumbar,spin,
Ziyad Reply
How bacteria create energy to survive?
Muhamad Reply
Bacteria doesn't produce energy they are dependent upon their substrate in case of lack of nutrients they are able to make spores which helps them to sustain in harsh environments
_Adnan
But not all bacteria make spores, l mean Eukaryotic cells have Mitochondria which acts as powerhouse for them, since bacteria don't have it, what is the substitution for it?
Muhamad
they make spores
Louisiaste
what is sporadic nd endemic, epidemic
Aminu Reply
the significance of food webs for disease transmission
Abreham
food webs brings about an infection as an individual depends on number of diseased foods or carriers dully.
Mark
explain assimilatory nitrate reduction
Esinniobiwa Reply
Assimilatory nitrate reduction is a process that occurs in some microorganisms, such as bacteria and archaea, in which nitrate (NO3-) is reduced to nitrite (NO2-), and then further reduced to ammonia (NH3).
Elkana
This process is called assimilatory nitrate reduction because the nitrogen that is produced is incorporated in the cells of microorganisms where it can be used in the synthesis of amino acids and other nitrogen products
Elkana
Examples of thermophilic organisms
Shu Reply
Give Examples of thermophilic organisms
Shu
advantages of normal Flora to the host
Micheal Reply
Prevent foreign microbes to the host
Abubakar
they provide healthier benefits to their hosts
ayesha
They are friends to host only when Host immune system is strong and become enemies when the host immune system is weakened . very bad relationship!
Mark
what is cell
faisal Reply
cell is the smallest unit of life
Fauziya
cell is the smallest unit of life
Akanni
ok
Innocent
cell is the structural and functional unit of life
Hasan
is the fundamental units of Life
Musa
what are emergency diseases
Micheal Reply
There are nothing like emergency disease but there are some common medical emergency which can occur simultaneously like Bleeding,heart attack,Breathing difficulties,severe pain heart stock.Hope you will get my point .Have a nice day ❣️
_Adnan
define infection ,prevention and control
Innocent
I think infection prevention and control is the avoidance of all things we do that gives out break of infections and promotion of health practices that promote life
Lubega
Heyy Lubega hussein where are u from?
_Adnan
en français
Adama
which site have a normal flora
ESTHER Reply
Many sites of the body have it Skin Nasal cavity Oral cavity Gastro intestinal tract
Safaa
skin
Asiina
skin,Oral,Nasal,GIt
Sadik
How can Commensal can Bacteria change into pathogen?
Sadik
How can Commensal Bacteria change into pathogen?
Sadik
all
Tesfaye
by fussion
Asiina
what are the advantages of normal Flora to the host
Micheal
what are the ways of control and prevention of nosocomial infection in the hospital
Micheal
what is inflammation
Shelly Reply
part of a tissue or an organ being wounded or bruised.
Wilfred
what term is used to name and classify microorganisms?
Micheal Reply
Binomial nomenclature
adeolu
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Source:  OpenStax, Collaborative statistics: supplemental course materials. OpenStax CNX. Oct 01, 2008 Download for free at http://legacy.cnx.org/content/col10586/1.2
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