Deck 5: Elementary Statistics

Question 1

A ____ distribution is characterized by a clustering of values around a central point and being well-centered on the mean.

A) deviation
B) skewed
C) normal
D) nonsymmetrical

Answer 1

C

Question 2

If a graph of a distribution shows a wide range of values, which statement is most likely true?

A) the mean and the median are identical
B) the distribution has a large standard deviation
C) the distribution has a small standard deviation
D) there is little variation in the values in the distribution

Answer 2

B

Question 3

This graph, called a ____, shows the frequencies of heights of 1000 women. 

A) skew curve
B) histogram
C) central tendency graph
D) plot of means

Answer 3

B

Question 4

For a distribution to be normal, it must show a specific clustering of values called ____.  

A) a mean equal to the standard deviation
B) central tendency
C) a mean of 0
D) a standard deviation of 1

Question 5

What is a collection of values called?

A) a distribution
B) a central tendency
C) a standard deviation
D) a histogram

Question 6

In a standard normal distribution, about ____ percent of values are within one standard deviation.

A) 15
B) 22
C) 35
D) 68

Question 7

In a distribution, the difference between each value and the mean of the distribution is used to calculate the ____.

A) standard deviation
B) normalcy
C) median
D) mode

Question 8

These two curves show ____.

A) large differences in standard deviations
B) inconclusive evidence of similarity
C) skewed curves
D) standard normal curves

Question 9

These two curves show ____.

A) large differences in standard deviations
B) similar means
C) skewed curves
D) standard normal curves

Question 10

In comparing two curves graphed on the same axis, if the difference between the two means is four standard deviations or more, the difference between the two curves is considered to be statistically ____.

A) conclusive
B) inconclusive
C) insignificant
D) significant

Question 11

A procedure for calculating an average that relies on the most numerous value in a distribution is the ____.

A) median
B) mode
C) standard deviation
D) mean

Question 12

For the most reliable conclusions about data, the sample size should be at least ____.  

A) 5
B) 10
C) 25
D) 50

Question 13

In the distribution below, what is the median?
           4, 6, 7, 9, 12, 17, 19

A) 9
B) 10
C) 12
D) 74

Question 14

Which letter represents a normal distribution?   

A) A
B) B
C) C
D) D

Question 15

What is the mean of a standard normal distribution?

A) 0
B) 1
C) 2
D) 5

Question 16

In a standard normal distribution, about ____ percent of values are between 2 and 3 standard deviations above or below the mean.

A) 2.2
B) 3.6
C) 4.3
D) 5.6

Question 17

If one adds the values in a group to create a sum and then divides the sum by the number of values in the group, the ____ would be derived.

A) standard deviation
B) mode
C) median
D) mean

Question 18

In these examples of bell curves, which one indicates that most of the data lie closest to the average?  

A) A
B) B
C) C
D) D

Question 19

If a graph of a distribution shows a very narrow range, which statement is most likely true?

A) the mean and the median are identical
B) the distribution has a large standard deviation
C) the distribution has a small standard deviation
D) there is much variation in the values in the distribution

Question 20

In the distribution below, what is the mean?
           4, 6, 7, 9, 12, 17, 19

A) 9.6
B) 10.6
C) 12.6
D) 14.6