Week 2 Quiz

Week 2 Quiz

Question 1

1.  

A numerical value used as a summary measure for a sample, such as sample mean, is known as a

		population parameter
		sample parameter
		sample statistic
		population mean

Question 2

1.  

The 50th percentile is the

		mode
		median
		mean
		third quartile

Question 3

1.  

The difference between the largest and the smallest data values is the

		variance
		interquartile range
		range
		coefficient of variation

Question 4

1.  

When data are positively skewed, the mean will usually be

		greater than the median
		smaller than the median
		equal to the median
		positive

Question 5

1.  

The numerical value of the standard deviation can never be

		larger than the variance
		zero
		negative
		smaller than the variance

Question 6

1.  

Which of the following symbols represents the standard deviation of the population?

		σ2
		σ
		μ
		x

Question 7

1.  

Which of the following symbols represents the mean of the population?

		σ2
		σ
		μ
		x

Question 8

1.  

Which of the following symbols represents the mean of the sample?

		σ2
		σ
		μ
		x

Question 9

1.  

Two events are mutually exclusive

		if their intersection is 1
		if they have no sample points in common
		if their intersection is 0.5
		None of these alternatives is correct.

Question 10

1.  

The range of probability is

		any value larger than zero
		any value between minus infinity to plus infinity
		zero to one
		any value between -1 to 1

Question 11

1.  

The sum of the probabilities of two complementary events is

		0
		0.5
		0.75
		1

Question 12

1.  

The union of events A and B is the event containing

		all the sample points belonging to B or A
		all the sample points belonging to A or B
		all the sample points belonging to A or B or both
		all the sample points belonging to A or B, but not both

Question 13

1.  

Events A and B are mutually exclusive. Which of the following statements is also true?

		A and B are also independent.
		P(A ∪ B) = P(A)P(B)
		P(A ∪ B) = P(A) + P(B)
		P(A ∩ B) = P(A) + P(B)

Question 14

1.  

The set of all possible sample points (experimental outcomes) is called

		a sample
		an event
		the sample space
		a population

Question 15

1.  

If A and B are independent events, then

		P(A) must be equal to P(B)
		P(A) must be greater than P(B)
		P(A) must be less than P(B)
		P(A) must be equal to P(A│B