MATH311 Statistics Quiz

Question 1 of 25
1.0 Points
Which of the following correctly describes the relationship between a sample and a population?

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Part 2 of 9 –
 
Question 2 of 25
1.0 Points
The probability of an event and the probability of its complement always sum to:

 
 
 
 

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Question 3 of 25
1.0 Points
Three cards are drawn from a deck without replacement. What is the probability that all three cards are clubs?

 
 
 
 

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Part 3 of 9 –
 
Question 4 of 25
1.0 Points
The following data were obtained from a survey of college students. The variable X represents the number of non-assigned books read during the past six months.
x
0
1
2
3
4
5
P (X=x)
0.20
0.25
0.20
0.15
0.10
0.10

Find P( X > 1)

 
 
 
 

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Question 5 of 25
1.0 Points
Find the variance of the following probability distribution. 

X P(X)
1 0.10
2 0.35
3 0.10
4 0.15
5 0.30

 
 
 
 

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Question 6 of 25
1.0 Points
In a small town, 60% of the households have dogs. If 5 households are randomly selected, what is the probability that at least 4 of them have dogs?

 
 
 
 

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Part 4 of 9 –
 
Question 7 of 25
1.0 Points
The standard deviation of a probability distribution must be:

 
 
 
 

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Question 8 of 25
1.0 Points
In a normal distribution, changing the standard deviation:

 
 
 
 

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Question 9 of 25
1.0 Points
If Z is a standard normal random variable, then the value z for which P(-z < Z < z) equals 0.8764 is

 
 
 
 

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Question 10 of 25
1.0 Points
The average height of flowering cherry trees in a nursery is 11 feet. If the heights are normally distributed with a standard deviation of 1.6, find the probability that a randomly selected cherry tree in this nursery is less than 13 feet tall.

 
 
 
 

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Question 11 of 25
1.0 Points
The standard deviation of a probability distribution is a:

 
 
 
 

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Question 12 of 25
1.0 Points
The normal distribution is:

 
 
 
 

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Part 5 of 9 –
 
Question 13 of 25
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), “E” or “e” (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. 
Complex numbers should be in the form (a + bi) where “a” and “b” need to have explicitly stated values. 
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. 

The histogram below represents scores achieved by 250 job applicants on a personality profile.

The histogram below represents scores achieved by 250 job applicants on a personality profile.

How many job applicants scored between 10 and 30? Place your answer in the blank. Do not use any stray symbols.  For example, 123 would be a legitimate answer.

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