Fall 2010
FORM P
Name
Last:_____________________
First:
______________________
Exam 2:
Ch. 4, 5, 6, 7
Directions:
•
Print your NAME on THIS EXAM
•
Print your NAME on your SCANTRON.
• Write FORM P on your SCANTRON.
• Each question has exactly one BEST answer.
There are 21 questions.
• You may write on this exam.
There is no scratch paper allowed.
• Each question is worth 5 points for a total of 105 points. This includes 5 bonus points!
• If you have no note page, you must write NO NOTES
on your SCANTRON.
• Put your SCANTRON and PAGE of NOTES inside your EXAM. When your exam is returned, you
will get back all materials you turned in.
• Turn your cell phone OFF.
Any noise from a cell phone will signal that your exam is over.
• FAILURE TO FOLLOW ALL INSTRUCTIONS WILL COST YOU THE 5 BONUS POINTS!
_________________________________________________________________________________________________________
1. Which of the following distributions is skewed left?
A. Poisson
B. Exponential
C. Normal
D. None is skewed left.
2.
Linus was visiting the Great Pumpkin Patch where he decided to buy a pumpkin from a section of the
pumpkin patch that had pumpkins with a mean weight of 29.6 pounds and a standard deviation of 4.1
pounds.
Somehow, Linus determined that the weight of the pumpkin he purchased actually corresponded
to a zscore of 1.78.
How much did Linus’s pumpkin weigh?
A.
27.48 pounds
B.
22.30 pounds
C. 36.90 pounds
D. 27.40 pounds
3.
Which of the following is NOT a characteristic of the Poisson distribution?
A. The probability distribution is discrete.
B. Occurrences generally happen a small number of times in the interval.
C. The expected value for the variable is the product of the number of trials and the probability of
success in a single trial.
D. The variable can only have a finite number of values.
4.
In order for the sample averages of a random variable to be approximately normal under the Central
Limit Theorem, which of the following conditions is
NOT IMPORTANT
?
A.
The original population of the random variable has a normal distribution.
B.
“n” represents the number of samples averaged together at a time, not the number of times an
experiment is done.
C.
Samples are drawn randomly from the population.
D.
The distribution of sample averages has a smaller standard deviation than that of the distribution of
the original random variable.
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View Full DocumentQuestions 5 – 6 refer to the following:
In 2007, California ranked 41st in the nation with a high school graduation rate of 62.7% (percent of
students leaving a California high school who graduated with a high school diploma).
(Source: http://californiaschildren.typepad.com/californiaschildren/2010/06/hsgradratesplumetinca.html)
Suppose we randomly select 20 students who left a California high school in 2007.
We are interested in
the number of students who graduated with a high school diploma.
5.
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 Spring '11
 Liu
 Normal Distribution, Standard Deviation, d., c., C D C C

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