Study your flashcards anywhere!
Download the official Cram app for free >
 Shuffle
Toggle OnToggle Off
 Alphabetize
Toggle OnToggle Off
 Front First
Toggle OnToggle Off
 Both Sides
Toggle OnToggle Off
 Read
Toggle OnToggle Off
How to study your flashcards.
Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key
Up/Down arrow keys: Flip the card between the front and back.down keyup key
H key: Show hint (3rd side).h key
A key: Read text to speech.a key
60 Cards in this Set
 Front
 Back
67, 90, 80, 100, 84, 92, 100, and 78
Find Q1 and Q3 by hand 
(1)find mediain to find the lower and upper half
(2)Q1= 79 and Q3= 96 

How do u find Q1 by hand?

find the median of the lower half of the data


How would you find Q3 by hand?

find the the medain of the upper half


What does dispension refer to?

the spread


NAME
this refers to the spread 
dispension


What does the dispension measure?

(1)the spread of the data around the measures of the central tendency


NAME
this measures the spread of the data around the measures of the central tendency 
dispension


What is the symbol for sample variance?

s^2


What does s^2 stand for?

the sample variance


What are the (5)parts that make up the dispension?

(1)s^2 (2)S (3)σ^2 (4)σ (5)range


What does S stand for?

sample standard deviation


NAME
this stands for sample standard deviation 
S


What does the symbol σ^2 stand for?

population varaince


NAME
this symbol represents the the population variance 
σ^2


What does the symbol σ stand for?

the population standard deviation


NAME
this symbol represents the population deviation 
σ


What is the range?

is the highest minus the lowest


What is the purpose of the standard deviation?

to measure how much each observation is above or below the mean


NAME
this measures how much each observation is above or below the mean 
standard deviation


The standard deviation measures how much each observations is above or below the (1)

mean


The stanard deviation measures how much each observations is (1)the mean

above or below the


Given that the mean is 80 and the S is 5. what would be A and C on the graph bewlow
 A 80 B C 
A= 75
C=90 

How do you find the s^2 by hand?

(∑ (xmean)^2)/(n1)


0, 2,4, 3, and 6
Find s^2 by hand. 
(∑ (xmean)^2)/(n1)
s^2=5 

How do you find the σ by hand?

√ ((∑xu)^2)/(n1))


How do you find the the σ^2 by hand?

((∑xu)^2)/(n1))


What does u the greek symbol in stats represent?

the mean of the population


NAME
this greek symbol in stats represents the mean of a population 
u


The normal curve can be also be called (1)

bell curve or bell shaped symmetric distribution


the (1)normal curve can also be called the bell curve or symmetric distribution

normal curve


Using Graph 21,
(1)what is the freq about region A? (low, med, or high) 
low


Using graph 21,
(1)what are observations you can make about region A? (low, med, or high) 
low


Using graph 21,
(1)what is the frequency about region B? (low, med, or high) (low, med, or high) 
high


Using graph 21,
(1)what are observations you can make up region B? (low, med, or high)q 
med


Using graph 21,
(1)What is the frequency of region C? (low, med, or high) 
low


Using graph 21,
(1)what are some observations taht you can make about C? (low, med, or high) 
high


What is normal distribution used for?

mumerical data that is continous


What type of data is the normal distrubtion of data suitable for?

for data that is numerical and continous


STATE WHETHER DATA IS SUITABLE FOR BELL CURVE (NORMAL DISTRUBTION)
grades 
yes


STATE WHETHER DATA IS SUITABLE FOR BELL CURVE (NORMAL DISTRUBTION)
income 
yes


STATE WHETHER DATA IS SUITABLE FOR BELL CURVE (NORMAL DISTRUBTION)
list of people heights 
yes


STATE WHETHER DATA IS SUITABLE FOR BELL CURVE (NORMAL DISTRUBTION)
weight 
yes


STATE WHETHER DATA IS SUITABLE FOR BELL CURVE (NORMAL DISTRUBTION)
number of traffic accidents 
no


STATE WHETHER DATA IS SUITABLE FOR BELL CURVE (NORMAL DISTRUBTION)
number of bad checks written at walmart 
no


STATE WHETHER DATA IS SUITABLE FOR BELL CURVE (NORMAL DISTRUBTION)
number of babies born at a hosiptal 
no


Use graph 22,
(1)if you where given the standard deviation how do you find out the spread of data that falls into the CD range? 
mean +/ s


Using graph 22,
(1)how do you find out the spread of data that falls into the B to E range? 
mean +/ s


Using graph 22,
(1)how do you find out the spread of data that falls into the AF range? 
mean +/ s


What is the imperical rule?

689599 rule


Using graph 22,
(1)Given that the s is 5, what is the range of data starting from C to D? 
75 to 80


If the distrubtion is normal then (1)

the mean and the mode are equal


If the distrubtion is (1)then the mean and the mode are the same

normal


Using graph 22,
What was the score of students who scored in the 68% range? 
mean+/5= 75 to 85


Using graph 23,
What was the score of students who scored in the 95% range? 
80+/2(5)= 70 to 90


Using graph 22,
what was the score of students who scored in the 99% range? 
mean +/3s
80+/15 = 65 to 95 

Using graph 24,
(1)tell what the distrubtion is? (2)Tell what the lables on the graph are (3)using your answers to the above, fill in the blanks A(a)B(b)C (<,>) 
(1)skewd to the right
(2)A= mode B= median C= mean (3)mode< median<mean 

Using graph 25
(1)tell what the distrubtion is? (2)Tell what the lables on the graph are (3)Using your answers from above, fill in the blanks A (a)B (b)C (<,>) 
(1)skewed to the left
(2)A= mean B=median C=mode (3)mean>median>mode 

Using graph 26
(1)tell what the distrubtion is? (2)Tell what the lables on the graph are (3)Using your answers from above, fill in the blanks A (a)A (b)A (<,>) 
(1)symmetric
(2)A= mean, mode, and median (3)they are all equal 

Using graph 27,
describe the distrubtion 
symmetric


Using graph 28,
describe the distrubtion 
symmetric
