Question 1
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Consider the following study: We want to know the average amount of money first
year college students spend at NDD College on accessories. We randomly survey
22 first year students at the college. Four out of the 22 students spent $33, $110,
$180, and $197, respectively. The target parameter of this survey is:
Select one:
a. The average amount of money spent by the 22 first year college students that
participated in the survey.
b. The 22 first year students that participated in the survey.
c. (33 + 110 + 180 + 197)/4 = 130 Dollars.
d. The average amount of money spent by all first year students of the college.
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The correct answer is: The average amount of money spent by all first year
students of the college.
Question 2
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Consider the following relative frequency table on hurricanes that have made direct
hits on the U.S. between 1851 and 2004. Hurricanes are given a strength category
rating based on the minimum wind speed generated by the storm.
(http://www.nhc.noaa.gov/gifs/table5.gif ) (ALTERNATE DOWNLOAD
LINK)
Frequency of Hurricane Direct Hits
,Category # Direct Hits Relative Freq. Cum. Relative Freq.
1 109 0.3993 0.3993
2 72 0.2637
3 71 0.2601
4 18 0.9890
5 3 0.0110 1.0000
The relative frequency of direct hits that were at most category 2 storm is: (The
answer may be rounded up to 3 decimal places of the actual value.)
Answer:
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The correct answer is: 0.663
Question 3
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Consider the following data:
4.4, 5.3, 4.4, 2.8, 0.9, 6.1, 3.0, 8.6, 10.7, 4.3, 1.9, 12.0, 5.9, 4.8, 7.7
The sample variance is equal to (the answer may be rounded up to 3 decimal
places of the actual value):
Answer:
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The correct answer is: 9.735998
Question 4
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,Distribution of Y
Value Probability
0 0.23
4 0.14
12
16 0.16
20 0.20
Complete the probabilities of the random variable Y in above table. The
expectation of Y is equal to
Answer:
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The correct answer is: 10.36
Question 5
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Meiosis is the process in which a diploid cell that contains two copies of the genetic
material produces an haploid cell with only one copy (sperms and eggs). The
resulting molecule of genetic material is linear molecule that is composed of
consecutive segments: a segment that originated from one of the two copies
followed by a segment from the other copy and vice versa. The border points
between segments are called points of crossover. The Haldane model for
crossovers states that the number of crossovers between two loci on the genome
has a Poisson(λ) distribution. Assume that the expected number of crossovers
between two loci is 0.66. The probability of obtaining at most 1 crossovers
between the two loci is (The answer may be rounded up to 3 decimal places of the
actual value.)
Answer:
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The correct answer is: 0.8579732
, Question 6
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The patient recovery time from a particular surgical procedure is Normally
distributed with a mean of 9.3 days and a standard deviation of 3.5 days. The
probability of spending between 5 to 10 days in recovery is: (The answer may be
rounded up to 3 decimal places of the actual value.)
Answer:
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The correct answer is: 0.4696434
Question 7
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It is claimed that the expected length of time some computer part may work
before requiring a reboot is 26 days. In order to examine this claim 80 identical
parts are set to work. Assume that the distribution of the length of time the part
can work (in days) is Exponential. The central region that contains 70% of the
distribution of the average is of the form E(X) ± c, where E(X) is the expectation of
the sample average. The value of c is (You are asked to apply the Normal
approximation to the distribution of the average of the 80 parts that are examined.
The answer may be rounded up to 3 decimal places of the actual value.)
Answer:
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The correct answer is: 3.012796
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Not answered
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Question text
Consider the following study: We want to know the average amount of money first
year college students spend at NDD College on accessories. We randomly survey
22 first year students at the college. Four out of the 22 students spent $33, $110,
$180, and $197, respectively. The target parameter of this survey is:
Select one:
a. The average amount of money spent by the 22 first year college students that
participated in the survey.
b. The 22 first year students that participated in the survey.
c. (33 + 110 + 180 + 197)/4 = 130 Dollars.
d. The average amount of money spent by all first year students of the college.
Feedback
The correct answer is: The average amount of money spent by all first year
students of the college.
Question 2
Not answered
Marked out of 1.00
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Question text
Consider the following relative frequency table on hurricanes that have made direct
hits on the U.S. between 1851 and 2004. Hurricanes are given a strength category
rating based on the minimum wind speed generated by the storm.
(http://www.nhc.noaa.gov/gifs/table5.gif ) (ALTERNATE DOWNLOAD
LINK)
Frequency of Hurricane Direct Hits
,Category # Direct Hits Relative Freq. Cum. Relative Freq.
1 109 0.3993 0.3993
2 72 0.2637
3 71 0.2601
4 18 0.9890
5 3 0.0110 1.0000
The relative frequency of direct hits that were at most category 2 storm is: (The
answer may be rounded up to 3 decimal places of the actual value.)
Answer:
Feedback
The correct answer is: 0.663
Question 3
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Consider the following data:
4.4, 5.3, 4.4, 2.8, 0.9, 6.1, 3.0, 8.6, 10.7, 4.3, 1.9, 12.0, 5.9, 4.8, 7.7
The sample variance is equal to (the answer may be rounded up to 3 decimal
places of the actual value):
Answer:
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The correct answer is: 9.735998
Question 4
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,Distribution of Y
Value Probability
0 0.23
4 0.14
12
16 0.16
20 0.20
Complete the probabilities of the random variable Y in above table. The
expectation of Y is equal to
Answer:
Feedback
The correct answer is: 10.36
Question 5
Not answered
Marked out of 1.00
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Question text
Meiosis is the process in which a diploid cell that contains two copies of the genetic
material produces an haploid cell with only one copy (sperms and eggs). The
resulting molecule of genetic material is linear molecule that is composed of
consecutive segments: a segment that originated from one of the two copies
followed by a segment from the other copy and vice versa. The border points
between segments are called points of crossover. The Haldane model for
crossovers states that the number of crossovers between two loci on the genome
has a Poisson(λ) distribution. Assume that the expected number of crossovers
between two loci is 0.66. The probability of obtaining at most 1 crossovers
between the two loci is (The answer may be rounded up to 3 decimal places of the
actual value.)
Answer:
Feedback
The correct answer is: 0.8579732
, Question 6
Not answered
Marked out of 1.00
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Question text
The patient recovery time from a particular surgical procedure is Normally
distributed with a mean of 9.3 days and a standard deviation of 3.5 days. The
probability of spending between 5 to 10 days in recovery is: (The answer may be
rounded up to 3 decimal places of the actual value.)
Answer:
Feedback
The correct answer is: 0.4696434
Question 7
Not answered
Marked out of 1.00
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Question text
It is claimed that the expected length of time some computer part may work
before requiring a reboot is 26 days. In order to examine this claim 80 identical
parts are set to work. Assume that the distribution of the length of time the part
can work (in days) is Exponential. The central region that contains 70% of the
distribution of the average is of the form E(X) ± c, where E(X) is the expectation of
the sample average. The value of c is (You are asked to apply the Normal
approximation to the distribution of the average of the 80 parts that are examined.
The answer may be rounded up to 3 decimal places of the actual value.)
Answer:
Feedback
The correct answer is: 3.012796
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