Day 02 Measures of Central Tendency.notebook March 01, 2019
March 1, 2019
Aim: SWBAT use the measures of central tendency to describe and interpret data.
Do Now: Read the notes at the top of Page 7 and try Example 1.
Homework: Pages 10 & 11 in the Unit 9 Packet
Unit 9 ~ Quiz (Statistical Analysis - 60 Points) is Friday, March 8th (Pages 1 - 32)
Day 02 Measures of Central Tendency.notebook March 01, 2019
The survey is not biased because the people surveyed werechosen randomly from the data base. Each book buyer had an equal chance of being chosen.
The survey is biased because the people surveyed were part of a group -- they were all leaving a Jazz concert . . . meaning they all like Jazz music.
I disagree, his sample is biased. While, Max used a pattern (every third child) he was outside a sporting goods store so all the children were part of a group . . . they are more likely to play sports.
60 n
= 8 40
2400 = 8n88
300 = nI predict there are 300 fish
in the lake.
Day 02 Measures of Central Tendency.notebook March 01, 2019
24 80
= n 1800
43,200 = 80n8080
540 = nI would predict that 540students have cell phones.
3 400
= n 100,000
n = 750
3 400
= n 150,000
450,000 = 400n400400
1125 = nI would predict that 1125coins will have misprints.
7 50
= n 400
2800 = 50n5050
56 = n
Since Zach found that 7 out of 50 students had traveled to a foreign country, we can set up a proportion to predict how many students out of 400 had traveled to a foreign country. When I solved the proportion learned that I could predict that 56 students traveled to a foreign country. This supports Zach's claim.
Day 02 Measures of Central Tendency.notebook March 01, 2019
Day 02 Measures of Central Tendency.notebook March 01, 2019
80 10
= 8 mean = 8
6, 7, 7, 7, 7, 8, 9, 9, 10, 10
median = 7.5 mode = 7
Day 02 Measures of Central Tendency.notebook March 01, 2019
Day 02 Measures of Central Tendency.notebook March 01, 2019
72 12
= 6 mean = 6
2, 3, 3, 3, 4, 4, 4, 4, 5, 6, 16, 18 median = 4
mode = 4
median or mode
Yes 16 & 18The outliers
affect the mean, but not the median. Since the median and mode are the same, we choose both.
Day 02 Measures of Central Tendency.notebook March 01, 2019
Day 02 Measures of Central Tendency.notebook March 01, 2019
264 11
= 24
5, 7, 8, 11, 12, 13, 15, 16, 17, 76, 84 median = 13
no mode
204 12
= 17
3, 6, 8, 9, 10, 10, 12, 14, 20, 27, 34, 51
median = 11
mode = 10
mean = 24 mean = 17
24 13 none
17 11 10
greater than
greater than
There is only 1 mode
greater
Day 02 Measures of Central Tendency.notebook March 01, 2019
Day 02 Measures of Central Tendency.notebook March 01, 2019
Day 02 Measures of Central Tendency.notebook March 01, 2019
200 10
= 20
11, 18, 19, 20, 20, 21, 22, 23, 23, 23 median = 20.5
mode = 23
Usually when there is an outlier, we do not choose the
mean = 20
mean. However, since the mean and median are very
close in value, we cannot choose one without the other.
Day 02 Measures of Central Tendency.notebook March 01, 2019
99 11
= 9 Class A
102 12
Class B = 8.5
Class A mean = 9
Class B mean = 8.5
8, 8, 8, 9, 9, 9, 9, 9, 10, 10, 10 median = 9Class AClass B 5, 6, 7, 8, 8, 9, 9, 10, 10, 10, 10, 10 median = 9
Class AClass B
mode = 9mode = 10