Vocabulary
What is it called when you find the sum of all items divided by the number of items in the set?
Mean or average
What is the mode? 1.06,9.3,59.59,6.01,25.17,1.06,6,1.06,0.7
1.06
What is the range?
5, 10, 17, 19, 35.3, 3, 4, 56, 7, 1.7
35.3 - 1.7 = 33.6
True or False: frequency is how often something does not occur or happens.
False ; frequency is how often something DOES occur (the "not" makes this statement false).
State the minimum and maximum value:
5, 10, 15, 20, 25
5 and 25
This contains the second and third quartiles, or the middle half of your data set.
IQR
What is the median?
93, 47, 37, 49, 25, 12, 13, 57
(37 + 47)/2 = 42
What is the Q3?
33, 4, 5, 6, 10, 15, 17, 18, 19, 21, 29
21
What is the first step to making a dot plot?
Draw a number line!
Q1 represents what percent of the data?
Q3 represents what percent of the data?
25%
75%
A single data point that goes far outside the average value of a group of statistics
1.) What is the median?
103, 2, 23, 156.5, 105.5, 145
2.) What is another name for median?
1.) 104.25
2.) Q2 or second quartile
What is the second quartile (Q2)?
29, 34, 39, 43, 73, 91, 198
43
You must put the list in order and then cross off the ends until you find the median.
The "box" of the box-and-whisker plot is made up of what components?
Q1, Q2, and Q3
This is the average distance between each data value and the mean
What is the mean?
1, 1, 2, 3, 4, 4, 5, 6, 7, 8
41/10 = 4.1
What is the quartile 1(Q1)?
35, 49, 53, 69, 69, 77, 84
49
What is the easiest measure you can find looking at the dot plot?
*hint: mean, median, mode, range, Q1, Q3, IQR*
Mode!
What is the IQR?
2, 4, 8, 10, 12, 19,
8
Laura mowed 8 lawns. She earned $12, $10, $15, $15, $15, $10, and $9 for seven lawns. How much did she earn the eight time if the mean of the data is $12?
$10
Find the IQR of the data set.
30, 45, 46, 72, 78, 89, 99, 100, 100
Median = 78 q1 = 45.5 q2 = 99.5
iqr = 99.5-45.5 = 54
Which data sets have outliers? State all that apply and state which numbers in the set are the outliers.
A.) 14, 21, 24, 27, 32, 35
B.) 15, 30, 35, 41, 44, 50, 78
C.) 16, 32, 38, 39, 41, 42, 58
D.) 17, 23, 28, 31, 39, 45, 75
E.) 18, 30, 34, 38, 43, 45, 68
C (16 and 58)
E (68)
What is the range and IQR of the data set?
4, 5, 6, 7, 8, 9, 10
What is the difference between range and IQR?
*Hint: think about the box and whisker plot
2.) Range is the difference between the highest and lowest value in the data set whereas IQR is the difference between Q3 (75% of the data) and Q1 (25% of the data) which gives you the middle 50% of the data.