Cuyamaca College Elementary Statistics Quiz Questions Attached you will find assignment that is required to be completed with proof of work done on same sh

Cuyamaca College Elementary Statistics Quiz Questions Attached you will find assignment that is required to be completed with proof of work done on same sheet A
Sample final
1. A survey was conducted to determine the average loss in home value in a certain
community. A random sample of 23 homes found a mean of $13120 with a standard
deviation of $1600. Assume the necessary assumptions are met. Which of the
following is a 99% confidence interval for the population mean loss in home value?
A.
B.
C.
D.
(12260.5870, 13979.4130)
(12183.5201, 14056.4799)
(12179.5166, 14060.4834)
None of the above
Work:
2. A recent article stated that car owners drove an average of 3500 miles between oil
changes last year. A random sample of 26 cars getting an oil change found a mean
distance of 3375 miles since the last oil change with a standard deviation of 225
miles. Is this sufficient evidence to show the mean travel distance between oil
changes has decreased?
Identify the appropriate null and alternative hypotheses.
A. H 0 :
3500 H a :
3500
B. H 0 :
3500 H a :
3500
C. H 0 :
3375 H a :
3375
D. H 0 :
3500 H a :
3500
Use the following information to answer problems 3-4
A survey found that 73% of adults have a landline at their residence (event A); 83% have a
cell phone (event B). It is known that 2% of adults have neither a cell phone nor a landline.
3. What is the probability that an adult selected at random has both a landline and a cell
phone?
A. 0.58
B. 0.98
C. 0.6059
D. None of these
Work:
4. Given an adult has a cell phone, what is the probability he does not have a landline?
A. 0.27
Work:
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B. 0.25
C. 0.3012
D. None of these
A
5. Faculty members at a large university have found over the past several semesters that
a cell phone rings in class on average 20 times per semester. A reporter for the school
newspaper claims that students are more courteous with their cell phones now than in
past semesters, and that the average has decreased. The reporter finds that in a
random sample of 19 classes, the average number of times a cell phone rang last
semester was 18.3 with a standard deviation of 2.7 calls. Does the evidence support
the reporters claim?
A hypothesis test was conducted, with the test statistic calculated to be -2.74
The corresponding p-value is:
A. 0.0031
B. 0.0062
C. 0.005
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